64 Bulletin of Laboratories of De^iison University [ v^oi. xi. 
Monumetha. 
About 14 mm. long, black; occiput and pleura with sooty hair; thorax 
above with dull white hair; lateral margins of first two abdominal 
segments with white hair-patches. (Gila R.) . borealis, Cress. 
Alcidamea. 
About 13 mm. long, black, with white and mouse-grey pubescence. In 
general appearance like Andrena electrica. (Mesilla Valley.) 
. . . biscute lice, Ckll . , $ . 
Ashmeadiella. 
Abdomen red. (Mesilla Valley.) .... holtii, Ckll. 
Abdomen black, ....... 1 
1. Legs partly red ; length about 5)4 mm. (Mesilla Valley.) 
bigelovice, Ckll. 
Legs entirely black, ..... 2 
2. Large species, over 8 mm. long, . . .3 
Smaller, under 7 mm.; tegulm black or piceous, . 4 
3. Tegulae dark ferruginous. (Organ Mts., May, at fls. of 
Opuntia.) ..... opuntice, Ckll. 
Tegulae black. (Albuquerque, Sept., at fls. of Grindelia.) 
bucconis. Say. 
4. Length 5 mm. (Mesilla Valley, at fls. of mesquite.) 
. . . prosopidis, Ckll., 9 * 
, Length about 7 mm. (Santa Fe, at fls. of Cactus.) 
cactorum, Ckll., 9 • 
Length about 6)4 mm., head large. (Mesilla Valley.) 
meliloti, Ckll., ^ . 
Heriades. 
Front legs partly red ; length about 5 mm. (Mesilla Valley.) asteris, Ckll. 
Legs entirely black, ...... i 
1. First recurrent nervure uniting with first transverso-cubi- 
tal. (Santa Fe.) . . . crucifera, Ckll. 
First recurrent nervure not so uniting, . . 2 
2. Length 8 mm. or over. (Organ Mts., at fls. of Opuntia.) 
gracilior, Ckll. 
Length less than 8 mm., punctures on third abdominal 
segment much larger than those on second. (Santa Fe, 
Mesilla Valley, etc.) . . . carinata. Cress 
Lithurgus. 
About 16 mm. long; resembles z. Megachile. Abdomen with narrow 
white hair-bands, apex with fusco-fulvous hair. E (Santa Fe, Mesilla 
Valley.) 
Megachile. 
apicalis. Cress. 
Males. 
Front tarsi ordinary. 
. 
. I 
Front tarsi peculiar, 
. 
. 
. 2 
