48 Bulletin of Laboratories of Denison Unwerstty [Voi. xi. 
These three are all found in the Mesilla Valley ; texanus goes north to 
Embudo and Santa Fe ; melliventris to Rincon and Vega S. Jos6. The males of 
all have yellow abdomens banded with black. 
Andrena. 
Abdomen partly or wholly rufous, .... i 
Abdomen black or dark brown, at most pale-banded, . . 7 
Abdomen blue. (Santa Fe, July) . . . cerasifolii^ Ckll. 
1. Pubescence black. (Mesilla Valley, April.) . prima, Casad. 
Pubescence grey or fulvous, ... 2 
2. Wings clear or almost so; abdomen not closely punctured. 
(Mesilla Valley, Paraje, April.) sphecodina, Casadiand Ckll. 
Wings clouded at apex at least, ... 3 
3. Clypeus dark, at most with a yellow spot, . . 4 
Clypeus yellow, at least in the $ , • . . 5 
4. First segment of abdomen very feebly and sparsely punc- 
tured. Mesilla Valley, April.) . . Jessica^ Ckll. 
First segment of abdomen ^^strongly punctured. (Santa 
F6, Aug.) .... argemonis, Ckll. 
5. Dorsum of thorax honey yellow. (Northern N. M.) mellea, Cress. 
Thorax entirely black, .... 6 
6. Second segment of abdomen without a black band. (Me- 
silla Valley, Paraje, April.) . . prunorum, Ckll. 
Second segment of abdomen with a black band. (Mesilla 
Valley, April.) .... casadce^ Ckll. 
7. Pubescence black. (Mesilla Valley, April.) nigerrima^ Casad. 
Pubescence at least partly pale, ... 8 
8. Clypeus and part of sides of face yellow or white, 9 
Clypeus only yellow, .... 12 
Sides of face yellow, clypeus mostly dark. (Mesilla Val- 
ley, Oct.) .... pulchella^ Rob., 9 * 
Face all dark, ..... 13 
9. Wings dusky at apex, clypeus dark at sides,' first two seg- 
ments of abdomen with apical rufotestaceous bands. 
(Organ Mts., Sept.) . . aliciarum^ 9 * 
Wings clear, ..... 10 
10. Lower edge of clypeus broadly black, pulchella, Koh.j 
Clypeus cream-color, edge not broadly black, . 1 1 
11. Larger, flagellum dark, lateral face-marks pointed above. 
(Mesilla Valley, April.) capricornis, Csd. and Ckll., $ . 
Smaller, flagellum ferruginous beneath. (Mesilla Valley, 
April.) . . . primulifrons ^ Casad., $ . 
12. Abdomen with orange color-bands. (Santa F6.) 
. . . aureocincta^Q\i\[,, 
Abdomen without color-bands, strongly punctured; wings 
dusky at apex. (Mesilla Valley, April.) fracta^ Csd. and Ckll., ^ . 
