Sept.-Dec, I918.J FaLL : NeW SpECIES OF ApiON. 221 



hind tibise unarmed ; the tibiae in the female are unarmed as usual 

 and the femora are noticeably more slender than in the male. 



The presence of a terminal mucro on the middle tibiae only is a 

 unique character thus far in the genus, but it occurs again in the fol- 

 lowing species. 



This species should follow griscum, and may most certainly be 

 distinguished from it and allies by the peculiar male tibial armature. 



A. brunnicornis new species. 



Similar in most respects to the preceding species, notably so in having the 

 middle tibias alone of the male mucronate. It differs from eccentricum as fol- 

 lows. Size obviously smaller; beak shorter and stouter in the male, shorter 

 than the head and thorax, and more evidently thickened medially when 

 viewed in profile; antennas brownish testaceous, basal joint less elongate, the 

 second joint reaching the eye; tibial mucro curved inward a little at tip, not 

 so in eccentricum. 



In the female the beak is also stouter, and is a little more strongly curved 

 than in the same sex of eccentricum. 



The femora are more slender in the female than in the male as in 

 eccentricum. 



Length 1.6 to 1.9 mm. 



Hab. : Arizona. Chiricahua Mts. Collected by H. G. Hubbard. 



This species is definitely separable from all others except the pre- 

 ceding by the peculiar male tibial armature and from that by the 

 color of the antennae, in itself a very unusual character. 



A. eriogoni new species. 



Very closely related, and extremely similar to ventricosum, but averaging 

 a little smaller, and slightly less ventricose than the latter. The pubescence 

 is a little better developed than in ventricosum, and the beak is evidently 

 longer and more slender, being as long as the head and thorax in the male, and 

 a little more elongate in the female. The elytral interspaces are, as a rule, a 

 trifle wider and flatter in ventricosum. Length 1.4 to 1.55 mm. 



Hab. : Arr:.ona. Described from two males and two females 

 taken by Dr. E. A. Schwarz on Eriogoniim at Oracle and in the Santa 

 Rita Mts., June 5-30. The type a male from the first named locality. 



Ventricosum occurs abundantly on Prosopis in the Southwest. 



A. frontellum new species. 



Moderately robust, black, with grayish aspect, due to the dull lustre and 

 white appressed hairs which, though sparse, are somewhat conspicuous. Beak 



