Art. Ill,] 
Cockerell, New Mexico Bees. 
43 
S. Vernal species, appearing at willow blossom in May; 
about lo mm. long; stigma black. (Mesilla Valley.) 
. . . . salicicola, Ckll., 9 • 
Summer and autumn species, .... 9 
9. Punctuation of first abdominal segment feeble and sparse. lo. 
Punctuation of first abdominal segment strong, . 12. 
10. Species with cinereous pubescence, at most feebly yel- 
lowish, . . . . . . II, 
Small species with dense ochraceous pubescence ; tarsi 
ferruginous. (Mesilla, end of August.) . annce^ Ckll,, $ . 
11. Length about 8 mm., pubescence greyish-white. (Mesil- 
la Valley, end of September.) . . louisCB^y C\i\\.y 
Length about ii mm., pubescence of thorax with a deli- 
cate yellowish tinge. (White Sands, at flowers of Big- 
elovia, Ocioher.) . . . gypsicoiensy C\A\.y 
12. Lateral faces of posterior truncation of thorax dull. . 13. 
Lateral faces of posterior truncation shining or tubercu- 
late, not minutely roughened. (Watrous, Las Vegas, 
Santa Fe, Mesilla Valley, &c.) . americana. Cress., (J . 9 • 
13. Larger; hind spur of hind tibia barely ciliate. (Ruidoso 
Creek, July.) .... kincaidiiy OsW.y 9 * 
Smaller ; hind spur of hind tibia pectinate. (Santa Fe, August.) 
. . . cham(Bsarach(2y Ckll., 9 • 
Note . — For descriptions, see Ann. Mag. Nat. Hist , Jan., 1897. Some other 
species have been collected, but await study in the light of more abundant ma- 
terial. 
Prosapis. 
Males. 
Upper part of lateral face-marks receding from orbital margin, . i 
Upper part of lateral face-marks continuous along orbital margin, . 4 
1. Upper part of lateral face-marks arising away from the or- 
bital margin, ..... 2 
Upper part of lateral face-marks touching orbital margin 
at the base, . . . . . .3 
2. Wings not brownish, face yellow. (Santa F6.) 
. . . rudbeckicZy Ckll. & Csd. 
Wings tinged brownish, face yellowish-white. (Ruidoso 
Creek.) . . . rudbeckia x2^q.& ruidosensisy QMW.. 
3. Small species, with the upward extension of lateral face- 
marks itself little curved, and not greatly prolonged. 
(Mesilla Valley.) .... mesillcBy Ckll. 
Larger species, with the upward extenston of lateral face- 
marks narrow and inclined to be curved ; face-marks 
strongly yellow. (Ruidoso Creek.) . tridentulay Ckll. 
4. Supraclypeal mark small and narrow ; face much narrowed 
below. (Mesilla Valley.) . asinina, Ckll. & Casad. 
Supraclypeal mark broad and short. (Ruidoso Creek.) 
. . , . . wootoniy Ckll. 
