T. D. A. COCKERELL. 79 



Tegulse dark ; hair of third abdominal segmeut mixed black and white. 



Melissodes atriTrons Sm. 



Tegulse light fulvous 1. 



1. Larger i^I. (Epimelissodes) atri|>e$« Cress. 



Smaller M , georgiea Cress. 



Group E. 



Clypeus and labrum light ; thorax above without dark hair ; flagfillum all dark 



(mostly Synhalonia). 

 Mandibles with a large light spot; last joint of flagellum acuminate, curved and 



pointed 1. 



Mandibles without a light spot, or (in lepida, snoviana and fedoris) with a very 



small one 2. 



1. Abdominal hair bands broad and dense, pale ochreous- .neTadenNis Cress. 



(The supposed nevadensis from Las Cruces, New Mexico, as shown by the 



specimens in collection Amer. Ent. 8oc., is not that species at all. It has 



black hairs on scutellum, and runs near obliqua.) 



Abdominal hair bands less developed Antliedon conipla (Cress.). 



(The range of com pta is unexpectedly extended by a male taken by Prof. C. 



P. Gillette on Cheyenne Mountain, near Colorado Springs, Colo., July 9, 



1905.) 



2. Abdomen covered with fulvous hair 3. 



Abdomen without such hair ( Tetralonia) 4. 



3. Smaller; abdomen redder; second t. c. nearly straight; hair of cheeks and 



pleura pale fulvous Tetralonia fiilvohirta (Cress.). 



Larger; abdomen not so red ; second t. c. with a double curve; hair of cheeks 

 and pleura white iTIeliSMOdes lierricki Ckll- 



4. Apical part of abdomen black, with dark hair 5. 



Apical part of abdomen with light hair; yellow of (tlypeus notched at sides.. 8. 



5. A tuft of white hair just in fi-ont of apical plate; yellow of clypeus deeply 



notched laterally ; middle tarsi peculiai'. . .T. fiilTltarsiN (Cress.). 

 No tuft of white hair at apex 6. 



6. Upper lateral borders of clypeus black, the yellow not notched ; hind spurs 



normal T. alriventris (Sm.). 



Yellow of clypeus more or less notched or concave at sides 7. 



7. Hair of thorax above light fulvous. 



T. edward$«ii (Cress.); syn. angvstior Ckll. 

 Hair of thorax above very pale ochraceous; apical two segments of abdomen 

 with most of the hair reddi.sh, some hairs on penultimate segment 

 shining coppery ; basal joint of middle tarsus curved ; differs conspic- 

 uously from edivardsii in having hair of second abdominal segment 

 wholly pale. . . T. californica (Cress. i. 



8. Hind spurs of hind legs twisted and hooked. 



T. dilerta (Cress.) = speviosa auctt. (not Cress.). 

 Hind spurs normal 9. 



9. Smaller; mesothorax shining and strongly punctate; pubescence yellower 



than in frater T. lepida (Cress.). 



Larger 10. 



TBANS. AM. ENT. SOC. XXXII. JANUARY, 1906. 



