Art. III.] 
Cockerell, New Mexico Bees. 
57 
49. Head and thorax brassy green. (Santa F6, Socorro, at As. 
of Lepachys .) .... lepachidis^ Ckll. 
Head and thorax rather bluish green, (at fls. of Helian- 
thus.) ..... albipennis, Cress. 
50. Abdomen without distinct light markings, . . 51 
Abdomen with yellow or white markings, . 56 
51. Pale face-marks reduced to a spot on clypeus ; nervures 
brown, .... phymatcc^ Ckll., var. 9 • 
Pale face-marks not so reduced, lateral marks present ; 
nervures pallid, ..... 52 
52. Clypeus with two large dark patches on hind margin; me- 
sothorax very hairy. (Mesilla Valley, at fls. of Aster.) 
. . . . asteris, Ckll., 9 • 
Clypeus pale except the usual dots, . . 53 
53. Anterior tibiae black in front ; face extremely hairy. (Me- 
silla Valley, at fls. of Verbesina.) albovittata, Ckll., $ . 
Anterior tibiae yellow or rufotestaceous in front, . 54 
54. Marginal cell with the substigmatal portion very much 
larger than than the poststigmatal ; size very small . 
(San Marcial, at fls. of Larrea.) . larrearum^ Ckll., 9 • 
Marginal cell ordinary, .... 55 
55. Larger mm.), face less hairy, lateral face-marks 
shaped like the mainsail of a schooner, (Mesilla Valley, 
at fls. of Verbesina^ Sept.) . . vagans, Ckll., $ . 
Smaller (4 mm.), hairy, lateral face-marks triangular. 
(Mesilla Valley, at fls. of Chrysopsis.) vespertilio, Ckll,, $ . 
56. Abdomen with cream-colored bands, interrupted sublat- 
erally, ...... 57 
Abdomen with 6 or 8 white marks, . . 58 
Abdomen with yellowish marks; mesothorax dull, gran- 
ulated, .... affinis, Cress., $. 
57. Only the broad lower margin of clypeus white. (Mesilla 
Valley.) (var. chrysoceras differs from callicerata prin- 
cipally in its large, subquadrate head.) callicerata 
var. chrysoceras, Ckll., 
Clypeus entirely cream-color, except the usual black 
specks, .... callicerata, Ckll., 9 * 
58. Marks on abdomen straight ; clypeus white; length about 
5 mm. (Mesilla, at fls. of Aster spinosus.) ignota, Ckll., 9 • 
Marks on abdomen oblique, • • • 59 
59. Mesothorax shiny ; clypeus dark with a light spot ; face- 
markings white, . . . pectidis, Ckll., 9 • 
Mesothorax dull ; clypeus light with dark spots or bars ; 
face-markings yellowish. (Mesilla Valley, at fls. of 
Bigelovia, eic.) . . . fallax, CMi., 9 - 
60. Large species, length over 6 ram., . . 61 
Smaller species, 6 mm. or less, . . .64 
