1^4 KANSAS UNIVERSIIV (rj A RIERLY. 



One of the males from Soutli Dakota is the type of Psnidogoiiia 

 ruficaiida Towns.; the male from New york is the type of P. obsolcta 

 Towns.; the male from Kansas bears the XaXi^X Acroglossa hespcri- 

 daruni WW. (See below, Acioglossa) Concerning the type of ohso- 

 leta Prof. Townsend says: " [It] iliffers chiefly [from r//fji-atida~\ in 

 the anal segments being wholly black at tip, not at all rufous; the third 

 antennal joint blackish, rufous at base, arista brown." 



Onephalia flnitima n. sp. 



Four males and six females from Las Cruces, N. M. (Coll. Towns., 

 July 3 — Sept 20) were at first confounded with the preceding species, 

 which they greatly resemble. However, they differ in the much 

 smaller size of the frontal bristles, the greater width of the front 

 and the sides of the face, and correspondingly narrower facial de- 

 pression. C. ruficaiida has a bright brassy color on the sides of the 

 front, while in the present species they are cinereous with a slight 

 yellowish or brownish tinge. The third joint of the antennae in the 

 males varies in length from two to two and a half times the length of 

 the second joint; in the females from one and one-third to one and 

 two-thirds the length of the second. The second joint of the arista 

 varies in the males from three to six times its own width; in the 

 females from one and a half to five times its width. The bristles of 

 the facial ridges ascend in the male from one-half to three-fourths 

 the distance to the root of the antennae; in the females from three- 

 tenths to six-tenths. Two of the males show no red on the fourth 

 abdominal segment, while all of the females show at least a narrow 

 margin of red at the tip. The arista in both sexes may be geniculate 

 or not; it can hardly be called incrassate, except in one of the males. 

 A single male has a weak marginal bristle on the first segment. 



Thus from examination of my material in these Gonia-like gen- 

 era it appears that the third antennal joint is generally much shorter, 

 and the second joint much longer in the female than in the male; 

 the second aristal joint is not as long in the female as in the male, 

 and the cilia of the facial ridges reach higher in the male than in the 

 female. It is also seen that some males may have much shorter 

 ungues than other males of the same species. 



I feel no hesitancy in declaring my belief, formed in the study of 

 other groups of this family, before examination of these specimens, 

 that the relative length of the antennal joints, the relative length, the 

 width and the degree of geniculation of the aristal joints, the extent 

 to which the facial ridges are invaded by bristles, the presence or 

 absence of a sparce ocular pubescence and the closure of the first 

 posterior cell at or near the margin of the wing, are characters which 



