54 
Bulletin of Laboratories of Denison University [Voi. xi, 
13. Abdomen black, with pale yellowish bands, or yellow, 
with dark bands, . . . . .14 
Abdomen dark brown, with a short white band on second 
segment ; size very small. (Mesilla Valley, at fls. of 
Cladothrix .) . , . cladothricis, Ckll., 9 * 
Abdomen not banded, ..... 18 
14. Stigma brownish, mesothorax hairy ; length 7 mm. or 
over, ...... 15 
Stigma pallid ; length not over 6 mm., - . .16 
15. Nervures almost colorless. (Mesilla Valley, at fls. of 
Sphcsralcea.) . . . sphcEralcece^ Ckll., 9 * 
Nervures dark brown. (Santa Fe, at fls. of Sphceralcea) 
. . sphceralcete r2ice alticola, CkW.^ 9* 
16. Face with pale lateral marks, . . . 17 
Face all dark; abdomen brown-black, with three dull yel- 
low bands terminating abruptly before reaching the 
lateral margin. (Embudo, Sept., at fls. of Bigelovia.) 
. . . . sutfasciata, Ckll., 9* 
17. Anterior femora mostly black, abdomen with heavy dark 
bands. (Santa Fe, at fls. of Mentzelia.) 
. . . . mentzelicB^ Ckll., 9 • 
Anterior femora entirely pale, abdomen with evanescent 
bands. (Albuquerque, Mesilla Valley, at fls. of Ment- 
zelia.) ..... pallidior, Ckll., 9 * 
18. Head and thorax black, size small. (Organ Mts., at fls. 
of Pectis.) .... solitaria, Ckll., 9 * 
Thorax black except the green metathorax ; head green, 
front aeneous. (Mesilla Valley, at fls. ^of Bigelovia ) 
. . . _ . ceneifrons^QVW-.y 9 * 
Thorax black except the blue metathorax ; head blue ; a 
yellow spot on each side of the clypeus. (San Marcial, 
at fls. of Larrea.) . . . semiccernlea^ Ckll., 9* 
Head and thorax green, or greenish-blue, . 19 
19. Males, 5^ mm. long, clypeus black, supraclypeal area 
aeneous; hind margins of abdominal segments rather 
broadly hyaline. (Organ Mts., at fls. of Verbesina.) 
chrysophila, Ckll. 
Females, ...... 20 
20. Abdomen broad, mandibles bidentate, marginal cell ob- 
liquely truncate, . . , Ckll., 9 * 
Not so, . . . . . • . 21 
21. Small, about 4^ mm. long, nervures brown. (Mesilla Val- 
ley, at fls. of Bigelovia and Gutierrezia.) phymatcB, Ckll. 
A little larger, nervures white, upper edge of clypeus 
whitish, . . . . sidoe^ Ckll, 9 . 
Over 6 mm. long, nervures nearly colorless, 
verbesince^ var. nigrior, Ckll. 
