Art. III.] 
Cockerell, Neiv Mexico Bees. 
65 
1. Shape narrow ; apex of abdomen notched but not pro- 
duced. (Gila R.) .... exilis, Cress. 
Broader ; apex of abdomen produced, deeply notched, 
and bent downwards. (Mesilla Valley.) townsendiana^ Ckll, 
Broad, 13 mm. long; abdomen subquadrate, apex coarsely 
serrate and deeply notched, . . iexana, Cress. 
2. Abdomen without hair-bands ; last joint of antennae di- 
lated and flattened. (Ruidoso Creek.) . wootoni, Ckll. 
Abdomen with hair-bands, . . . .3 
3. First joint of anterior tarsi produced to a free apex, 4 
First joint of anterior tarsi not produced to a free apex, 5 
4. The free apex like the end of a finger ; hair-bands of ab- 
domen fulvous. (Gila R.) . . jidelis^ Cress. 
The free apex not like the end of a finger ; hair-bands 
white. (Santa Fe.) . . . pugnata^ Say. 
5. Thorax very pubescent, the pubescence more or less 
ochreous or fulvous, .... 6 
Thorax not very pubescent, the pubescence pale greyish 
to white, ...... 8 
6. Flagellum slender, not crenulated beneath. (Santa Fe.) 
. . . . latimanus^ Say. 
Flagellum stout, crenulated beneath, . . 7 
7. Pubescence of thorax yellowish-grey. (Tuerto Mtn., near 
Santa Fe ) . . . . comata^ Cress. 
Pubescence of thorax fulvous. (Gila R.) . Cress. 
8. Anterior legs slender; anterior tarsi with basal joint mere- 
ly expanded into a flat lamina at the side. (Mesilla 
Valley.) .... occidentalism Fox. 
Larger ; anterior femora stout, subtriangular in section, 9 
9. Anterior femur yellow where it touches tibia; pubescence 
of face yellowish. (Deming, Lone Mtn., Mesilla Val- 
ley.) ..... sidalcecB, Ckll. 
Anterior femur rufous where it touches tibia ; pubescence 
of face white. (Mesilla Valley.) . . casadce, Ckll. 
Females. 
Large and robust, length 14 mm. or over, . . . i 
Smaller, length under 13 mm., . . . . .2 
1. Ventral scopa pale fulvous, . . latimanus, Say. 
Ventral scopa white ; black on the last two segments. 
(Ruidoso Creek.) .... texana, Cress. 
2. Abdomen short and broad ; ventral scopa white, black on 
last segment. (Mesilla Valley.) . . brevis ^ Say. 
Abdomen long and narrow, .... 3 
3. Ventral scopa white, black on last segment; tegulae orange 
brown, .... occidentalism Fox. 
Ventral scopa entirely dull white; tegulse piceous, strong- 
ly punctured, .... exilism Cress. 
