Art. III.] 
Cockerell, New Mexico Bees. 
49 
13. Pubescence of thorax bright ferruginous; wings very dark, 
especially at apex. (Embudo, Sept., at flowers of 
Bigelovia.) .... vulpicolor^QVSS..^ 9* 
Pubescence of thorax not ferruginous, or wings not very 
dark, ...... 14 
14. Hair at apex of abdomen black or fuscous, . 15 
Hair at apex of abdomen pale or reddish, . 17 
15. Abdomen shining, strongly punctured. (Paraje, April.) 
. . . prunijloris^ 9* 
Abdomen microscopically tessellate, . . 16 
16. Tarsi with fuscous hair. (Sacramento Mts., Aug.) 
. . . apachevrum^ Ckll., 9 * 
Tarsi with pale hair. (Mesilla Valley, March, April.) 
. . electrica^ Csd. and Ckll., 9* 
17. Abdomen with continuous hair-bands, even on first seg- 
ment . . . . . . 18 
Abdomen with hair-bands more or less interrupted . 19 
Abdomen without any distinct hair-bands or well-defined 
patches, ...... 25 
18. Pubescence all white. ( Mesilla Valley, April. ) 
. . electrica, Csd. and Ckll., ^ . 
Pubescence strongly yellowish. (Santa F 6 , Aug.) mentzelice^ Ckll., 9 • 
19. Head very large, keeled behind eyes. (Santa F6 Canon, 
8000 ft., Aug.) platyparia, Rob (var. occidentalism 
Head ordinary, ..... 20 
20. Abdomen distinctly punctured, . . .21 
Abdomen more or less tessellate, hardly punctured, 22 
21. Wings strongly clouded at apex, . fracta^ Csd. and Ckll., 9 • 
Much smaller, wings perfectly clear, primulifrons Casad., 9 * 
22. Length 15 mm. (Albuquerque, at sunflowers. Sept ) 
.... helianthim Rob., 9 * 
Length 12 mm. or less, .... 23 
23. Tarsi ferruginous; small species. (Mesilla Valley, Paraje, 
April.), ..... salicinella, Ckll. 
Tarsi dark, ..... 24 
24. Pubescence pale grey to white. (Mesilla Valley, March, 
April.), .... monilicornisrn CkW.m 
Pubescence of thorax tinged with ochraceous ; wings 
strongly yellowish. (Paraje, April.), subaustralis, CkW., 9* 
25. Abdomen minutely tessellate, . sudaustralis, $. 
Abdomen distinctly punctured. (Mesilla Valley, March.) 
. . . . mesillcBm Ckll., 
Note. — The species of Andrena which fly in spring are to be taken in great 
number at the flowers of plum trees. 
