icon opens an example observation.These 58 native bees each have fewer than 50 records, making them the park’s least-sampled and the best targets for more survey effort.
Coverage tells you what each bee needs:
The icon opens an example observation.
Two ways to help. Some bees are on this list because they are hard to tell apart, not because they are scarce. When a bee can only be identified as far as its genus, it never counts toward a species, so a clear photo or a netted specimen an expert can confirm moves it off this list just as surely as finding a new one. The other way is to look somewhere new. The plants and months listed are only where people have searched so far, so different places and different times of year are worth trying.
| Bee | IUCN | Specimen | Photo | Total | Status | Coverage | Peak month | Active window | Where (transect) | Top flowers |
|---|---|---|---|---|---|---|---|---|---|---|
| Red List | netted | on iNat | specimen + photo | how often recorded | which method(s) it’s in | month seen most | months it’s been seen | transect seen most on | plants recorded on most | |
| Andrena auricomaGolden-haired Miner Bee | NE | 0 | 1 | 1 | rare | photo-only 🔬 | Jan | Jan | - | Ceanothus (Ceanothus) |
| Andrena cerasifoliiCherry Plum Mining Bee | NE | 0 | 1 | 1 | rare | photo-only 🔬 | Mar | Mar | OT | Sumacs (Rhus) |
| Anthidium jocosum | NE | 0 | 1 | 1 | rare | photo-only 🔬 | Jun | Jun | TP | Rabbit-tobaccos (Pseudognaphalium) |
| Diadasia australis | NE | 0 | 1 | 1 | rare | photo-only 🔬 | Jul | Jul | UPMON | Prickly Pears (Opuntia) |
| Diadasia bituberculataBindweed Turret Bee | NE | 0 | 1 | 1 | rare | photo-only 🔬 | May | May | BST | False Bindweeds (Calystegia) |
| Diadasia diminutaGlobe Mallow Bee | NE | 0 | 1 | 1 | rare | photo-only 🔬 | Jun | Jun | UPMON | Bushmallows (Malacothamnus) |
| Diadasia rinconisCactus Bee | NE | 0 | 1 | 1 | rare | photo-only 🔬 | Apr | Apr | - | Chollas (Cylindropuntia) |
| Dianthidium pudicumModest Pebble Bee | NE | 1 | 0 | 1 | rare | specimen-only 📷 | Jul | Jul | TP | Jimmyweeds and Goldenbushes (Isocoma) |
| Dufourea brevicornis | NE | 1 | 0 | 1 | rare | specimen-only 📷 | Apr | Apr | UPMON | Eschscholzia |
| Epeolus compactusCompact Cellophane-Cuckoo | NE | 0 | 1 | 1 | rare | photo-only 🔬 | Mar | Mar | - | Leptosyne |
| Halictus farinosusWide-striped Sweat Bee | NE | 0 | 1 | 1 | rare | photo-only 🔬 | Aug | Aug | OT | Wirelettuces (Stephanomeria) |
| Lasioglossum actinosum | NE | 0 | 1 | 1 | rare | photo-only 🔬 | Sep | Sep | - | Jimmyweeds and Goldenbushes (Isocoma) |
| Lasioglossum cabrilli | NE | 1 | 0 | 1 | rare | specimen-only 📷 | May | May | - | Woolly Sunflowers (Eriophyllum) |
| Lasioglossum ovalicepsOval-headed Sweat Bee | NE | 0 | 1 | 1 | rare | photo-only 🔬 | Mar | Mar | - | Paintbrushes (Castilleja) |
| Megachile fidelisHorn-faced Leafcutter Bee | NE | 1 | 0 | 1 | rare | specimen-only 📷 | Jul | Jul | - | Brittlebushes (Encelia) |
| Megachile policaris | NE | 0 | 1 | 1 | rare | photo-only 🔬 | Oct | Oct | - | Brittlebushes (Encelia) |
| Megachile texanaTexas Leafcutter Bee | NE | 1 | 0 | 1 | rare | specimen-only 📷 | Jul | Jul | - | Wild Buckwheats (Eriogonum) |
| Melissodes tessellatus | NE | 0 | 1 | 1 | rare | photo-only 🔬 | Sep | Sep | OT | Wirelettuces (Stephanomeria) |
| Melissodes verbesinarum | NE | 1 | 0 | 1 | rare | specimen-only 📷 | Oct | Oct | BST | Deervetch (Acmispon) |
| Perdita californicaCalifornia Fairy Bee | NE | 0 | 1 | 1 | rare | photo-only 🔬 | Jun | Jun | OT | Mariposa Lilies (Calochortus) |
| Trachusa perditaCalifornia Resin-Leafcutter | NE | 0 | 1 | 1 | rare | photo-only 🔬 | Jun | Jun | OT | Deinandra |
| Tetraloniella davidsoniDavidson's Longhorn Bee | NE | 1 | 1 | 2 | rare | both (thin) 📷🔬 | Feb | Feb-Apr | UPMON | Brittlebushes (Encelia), Leptosyne |
| Andrena oenotheraeOenothera Miner | NE | 0 | 2 | 2 | rare | photo-only 🔬 | Mar | Mar-Jun | TP | Suncups (Camissoniopsis) |
| Habropoda depressa | NE | 0 | 2 | 2 | rare | photo-only 🔬 | Feb | Feb-Mar | BST, UPMON | Sages (Salvia) |
| Lasioglossum mellipes | NE | 0 | 2 | 2 | rare | photo-only 🔬 | Feb | Feb-Mar | BST | False Bindweeds (Calystegia), Sages (Salvia) |
| Lasioglossum robustum | NE | 2 | 0 | 2 | rare | specimen-only 📷 | Apr | Apr-Jun | UPMON | Stinkweed (Cleomella), Wild Buckwheats (Eriogonum) |
| Lasioglossum turgiventre | NE | 2 | 0 | 2 | rare | specimen-only 📷 | Apr | Apr | BST | Deervetch (Acmispon), Rabbit-tobaccos (Pseudognaphalium) |
| Melissodes microstictus | NE | 2 | 0 | 2 | rare | specimen-only 📷 | Aug | Aug-Oct | BST | Jimmyweeds and Goldenbushes (Isocoma) |
| Osmia clarescens | NE | 2 | 0 | 2 | rare | specimen-only 📷 | Apr | Apr | BST, UPMON | Annual Cryptanthas (Cryptantha) |
| Perdita malacothricisDesert Dandelion Fairy Bee | NE | 0 | 2 | 2 | rare | photo-only 🔬 | Apr | Apr | TP | Pincushion Plants (Chaenactis) |
| Anthophorulagenus only, not yet identified to species | NE | 0 | 3 | 3 | rare | photo-only 🔬 | Jul | Jun-Jul | BST | Wirelettuces (Stephanomeria), Bushmallows (Malacothamnus) |
| Ashmeadiella cubiceps | NE | 3 | 0 | 3 | rare | specimen-only 📷 | Jun | May-Jun | BST | Brittlebushes (Encelia) |
| Andrena atypica | NE | 4 | 0 | 4 | rare | specimen-only 📷 | Mar | Mar | BST | Buckthorns (Rhamnus) |
| Atoposmia hemizoniae | NE | 4 | 0 | 4 | rare | specimen-only 📷 | Jul | May-Jul | TP | Deinandra |
| Centris rhodopus | NE | 0 | 4 | 4 | rare | photo-only 🔬 | Sep | Aug-Sep | - | Wirelettuces (Stephanomeria) |
| Colletes sleviniSlevin's Cellophane Bee | NE | 4 | 1 | 5 | rare | both (thin) 📷🔬 | Sep | Jun-Sep | UPMON | Wild Buckwheats (Eriogonum) |
| Lasioglossum californiae | NE | 5 | 0 | 5 | rare | specimen-only 📷 | May | Mar-Sep | UPMON, TP | Bahiopsis, Wild Buckwheats (Eriogonum), Brittlebushes (Encelia) |
| Andrena baeriae | NE | 6 | 0 | 6 | rare | specimen-only 📷 | Mar | Mar-Apr | TP | Goldfields (Lasthenia), Linanthus |
| Andrena pallidifoveaPale-fovea Miner | NE | 4 | 4 | 8 | rare | both (thin) 📷🔬 | Mar | Mar-Apr | UPMON, BST | Brittlebushes (Encelia), Leptosyne |
| Lasioglossum gaudiale | NE | 9 | 0 | 9 | rare | specimen-only 📷 | Oct | Jun-Oct | TP, BST | Deinandra, Heliotropes (Heliotropium), Woolly Sunflowers (Eriophyllum) |
| Nomada formula | NE | 0 | 10 | 10 | rare | photo-only 🔬 | Aug | Aug-Sep | OT, TP | Wirelettuces (Stephanomeria), Jimmyweeds and Goldenbushes (Isocoma) |
| Anthidium maculosumSpotted Woolcarder | NE | 0 | 11 | 11 | rare | photo-only 🔬 | Sep | Jun-Sep | OT, UPMON | Wirelettuces (Stephanomeria), Sairocarpus, Corethrogyne |
| Hoplitis grinnelliGrinnell's Small-Mason | NE | 1 | 11 | 12 | rare | both (thin) 📷🔬 | May | Mar-May | TP, OT | Brittlebushes (Encelia), Woodsorrels (Oxalis), Deervetch (Acmispon) |
| Hylaeus polifoliiBuckwheat Masked Bee | NE | 11 | 1 | 12 | rare | both (thin) 📷🔬 | Jun | Apr-Sep | BST, UPMON | Wild Buckwheats (Eriogonum), Corethrogyne, Baccharis |
| Bombus crotchii*Crotch's Bumble Bee | EN | 1 | 12 | 13 | rare | both (thin) 📷🔬 | May | Feb-May | BST, UPMON | Milkvetches (Astragalus), Deervetch (Acmispon), Yerba Santa (Eriodictyon) |
| Lasioglossum grinnelli | NE | 16 | 0 | 16 | uncommon | specimen-only 📷 | Jun | Mar-Jul | UPMON, BST | Wild Buckwheats (Eriogonum), Liveforever (Dudleya), Sages (Salvia) |
| Colletes ochraceusOchraceous Cellophane Bee | NE | 7 | 10 | 17 | uncommon | both (thin) 📷🔬 | Aug | Jun-Sep | UPMON, OT | Jimmyweeds and Goldenbushes (Isocoma) |
| Brachymelecta californicaCalifornia Digger-cuckoo Bee | NE | 2 | 16 | 18 | uncommon | both (thin) 📷🔬 | Apr | Mar-Jun | TP | Brittlebushes (Encelia), Deinandra, Wild Buckwheats (Eriogonum) |
| Diadasia ochraceaOchraceous Chimney Bee | NE | 2 | 16 | 18 | uncommon | both (thin) 📷🔬 | Jul | Apr-Aug | BST, UPMON | Bushmallows (Malacothamnus) |
| Melissodes moorei | NE | 18 | 1 | 19 | uncommon | both (thin) 📷🔬 | Sep | May-Oct | UPMON, TP | Jimmyweeds and Goldenbushes (Isocoma), Brittlebushes (Encelia), Wild Buckwheats (Eriogonum) |
| Ceratina arizonensisArizona Small carpenter | NE | 0 | 25 | 25 | uncommon | photo-only 🔬 | Sep | Feb-Dec | UPMON | Heliotropes (Heliotropium), Brittlebushes (Encelia), Jimmyweeds and Goldenbushes (Isocoma) |
| Megachile parallelaParallel Leafcutter Bee | NE | 3 | 24 | 27 | uncommon | both (thin) 📷🔬 | Sep | Jul-Oct | UPMON, BST | Jimmyweeds and Goldenbushes (Isocoma), Brittlebushes (Encelia), Deinandra |
| Biastesgenus only, not yet identified to species | NE | 0 | 31 | 31 | uncommon | photo-only 🔬 | May | Mar-May | TP, BST | Brittlebushes (Encelia), Wild Buckwheats (Eriogonum), Suncups (Camissoniopsis) |
| Lasioglossum incompletumIncomplete Sweat Bee | NE | 32 | 0 | 32 | uncommon | specimen-only 📷 | Jun | Apr-Oct | UPMON, BST | Wild Buckwheats (Eriogonum), Spurges (Euphorbia), Stinkweed (Cleomella) |
| Perdita interruptaCalifornia Poppy Fairy Bee | NE | 5 | 36 | 41 | uncommon | both (thin) 📷🔬 | Mar | Mar-May | TP | Eschscholzia, Leptosyne, Goldfields (Lasthenia) |
| Habropoda tristissima | NE | 6 | 38 | 44 | uncommon | both (thin) 📷🔬 | Apr | Feb-Apr | BST, OT | Sages (Salvia), Deervetch (Acmispon), Milkvetches (Astragalus) |
| Melissodes robustior | NE | 45 | 1 | 46 | uncommon | both (thin) 📷🔬 | May | Mar-Oct | TP, UPMON | Brittlebushes (Encelia), Corethrogyne, Liveforever (Dudleya) |
| Lasioglossum petrellum | NE | 6 | 43 | 49 | uncommon | both (thin) 📷🔬 | Sep | Jan-Sep | TP, BST | Jimmyweeds and Goldenbushes (Isocoma), Brittlebushes (Encelia), Wirelettuces (Stephanomeria) |
IUCN Red List codes. NE Not Evaluated · DD Data Deficient · LC Least Concern · NT Near Threatened · VU Vulnerable · EN Endangered · CR Critically Endangered. Source: IUCN Red List API v4.
These counts pool netted specimens and every iNaturalist photo, not just formal survey records, across all years and the whole park. Source: iNaturalist photos and netted specimens, Cabrillo National Monument (data as of 2026-09-14).
Because casual public photos count too, Status shows how often a bee is noticed rather than how many there are. A showy bee near a busy trail can read as common on public photos alone, so treat rare, uncommon, and common as recording frequency rather than true density. The cut-offs are rare below 15 records, uncommon 15 to 49, and common 50 or more.