1903.1 NATURAL SCIENCES OF PHILADELPHIA. 559 



BEES OF THE GENUS NOMADA FROM CALIFORNIA. 



by t. d. a. cockerell. 

 Table of Species. 



Males. 



Legs black and 3'ello\v; abdomen yellow-banded 1. 



Legs red or reddish, or black and red; apex of abdomen usually emar- 

 ginate, 7. 



1. Apex of abdomen emarginate, 2. 



Apex of abdomen entire ; large species 4. 



2. Size large, over 11 mm. long, exciirrens, Ckll. 



Size smaller, hardly or under 9 mm 3. 



3. Lateral face-marks narrow, gradually tapering to a point; a yellow 



spot at top of eye, dece7npunctata,C\d\. 



Lateral face-marks ending abruptly at level of antennae; no yellow 

 spot at top of eye sanctcecrucis , Ckll. 



Lateral face-marks obliciuely cut off above, with a projection point- 

 ing toward antennae, subsimilis, Ckll. 



4. Scutellum black ; anterior femora expanded into a large flat lamina, 



hesperia, Ckll. 

 Scutellum largely yellow; anterior femora ordinary, ... 5. 



5. Lateral face-marks obliquely trmicate above; a large black area 



between them and supraclypeal mark, . . edwardsii, Cresson. 



Lateral face-marks semilunar ; a narrower black area between them 



and supraclypeal mark, 6. 



6. Smaller, hind femora entirely black behind, 



edwardsii australior, Ckll. 

 Larger, hind femora yellow at apex behind, . . hemphilli, Ckll. 



7. Tegulae yellow; scutellum largely yellow; scape swollen, yellow in 



front; joint 3 much shorter than 4, . . . .pascoensis, Ckll. 



Tegulae not or hardly yellow (dull yellow in coquilletti) ; scutellum 



usually black, 8. 



8. Abdomen red or reddish, with lateral yellow spots, but no bands; 



apex emarginate ; scutellum black; mandibles simple, . . 9. 

 Abdomen more or less banded 11. 



9. Larger ; first abdominal segment black onl}- at extreme base ; abdo- 



men bright red, subvicinalis, Ckll. 



Smaller; more than basal half of first abdominal segment black; 



abdomen dull colored 10. 



10. Second submarginal cell nearly square, third narrowed almost to a 



point, bifurcata, Ckll. 



Second submarginal cell high and narrow, third about as broad 

 above as second, oregonica, Ckll. 



