Z PROCEEDINGS OF THE NATIONAL MUSEUM vol.77 



5. Frons shining, with small distinct punctures which are separated by a dis- 



tance as great as, or greater than, the width of a puncture ; third antennal 

 segment distinctly longer than twice the length of second, and distinctly 

 longer than fourth ; posterior face of propodeum coarsely reticulate ; apex 



of pygidium rounded; apical margin of clypeus yellow texana (Cresson). 



Frons dull, with close distinct punctures, the distance between them seldom 

 as great as the width of a puncture ; third antennal segment about twice 

 as long as second, and but little longer than fourth ; posterior face of 

 propodeum granular, and with irregular wrinkles ; apex of pygidium sub- 

 truncate ; clypeus black latimana, new species. 



6. Anterior tarsi much widened ; anterior femora thin and concave on anterior 



side beneath ; basal segments of antennal flagellum nodose beneath ; head 



at least partly yellow or reddish 7. 



Anterior tarsi not flattened ; anterior femora more or less cylindrical, not 

 concave beneath ; basal segments of antennal flagellum simple ; head 

 black texana (Cresson). 



7. Fore tibiae deep black except at apices, highly polished on ventral or inner 



surfaces, and about as wide as widest portion of fore tarsus (fig. 7), 

 the ventral surface hollowed out; scape of antennae entirely fulvous 



yellow dilata, new species. 



Fore tibiae entirely testaceous yellow, or infuscated above, and not as wide 

 as widest part of fore tarsus, the ventral or inner surface convex ; scape 

 of antennae blackened on one side, yellow on the other 8. 



8. Fore femur not much produced downward at middle, extreme height at 



middle much less than half as great as its entire length (fig. 5) ; sides of 



face usually without a yellow line latimana, new species. 



Fore femur much produced downward at, or beyond, middle, greatest height 

 equal to, or over, half as long as entire length (fig. 6) ; face entirely 

 or partly pale 9. 



9. Reddish brown species, apex of abdomen black ; fore femur highest at apical 



third peculiaris Fox. 



Black species, with portions of the head and abdomen reddish or yel- 

 lowish 10. 



10. Head ferrugineous except for a black transverse band on vertex extending 



from eye to eye and enclosing the ocelli vierecki Rohwer. 



Head mostly black 11. 



11. Clypeus largely black, yellow along the lower margin nodosa Fox. 



Clypeus entirely yellow nodosa var. clypeata, new variety 



DIDINEIS STEVENSI Rohwer 



Didineis stevensi Rohwer, Proc. Ent. Soc. Washington, vol. 25, 1923, No. 4, 

 p. 98. 



This species is known only from a single female collected at 

 Sheldon, N. Dak. 



DIDINEIS PECULIARIS Fox 



DidiMeis peculiaris Fox, Ent. News, vol. 5, 1894, p. 128. 



This species was described from a number of males and females 

 collected in Montana. As Bradley pointed out, the fore tarsi and 

 femora of this species are peculiarly modified so it belongs to a group 

 of males related to nodosa, but may be readily separated in both sexes 



