Dec, 1904.] Tabanidae. 225 



contiguous with the hyahne base of the discal cell, the second 

 basal cell is hyaline with the exception of a slight infuscation at 

 base. The outer border of the cross-band is nearly straight, the 

 hvaline triangle is rather small and does not cross the second vein 

 and the apical spot fills out the marginal cell and much of the 

 first and second submarginal and first posterior cells. The 

 abdomen is yellow with two black stripes extending frcm the 

 scutellum to the apex and on either side of these another nar- 

 rower stripe of the same color extending backward frcm the 

 anterior part of the third segment. The type was collected in 

 Missouri and I have specimens from Kansas. 



Chrysops proclivis Osten Sacken. Frontal callosity, antennae, 

 each facial callosity outside of the suture and cheeks black. First 

 basal cell of the wing black for its entire length in the middle but 

 near the apex on either side next the longitudinal veins there is 

 some hvaline, the second basal is hyaline, the outer margin of the 

 crossband is curved, the hyaline triangle is rather large and its 

 apex crosses the second vein, and the apical spot is rather large 

 occupying the apical part of the marginal and the first and second 

 submarginal cells. Abdomen with a black spot beneath the 

 scutellum widest before and connected with a black spot of the 

 second segment. The black of the second segment is slightly 

 emarginate behind and all but attains the posterior margin, and 

 the broad yellow sides of this segment each inclose a small black 

 dot. The remaining segments are black wnth a narrow^ serrate 

 yellow posterior border, or there may be more or less separation 

 of the black to form spots as in some of the related species. 



The male is much darker than the female. The thorax is 

 black with gray stripes, the wing is black with a small spot at the 

 apex of each basal cell, a suggestion of a hyaline spot on the mid- 

 dle of the discal cell, and a hyaline triangle in all respects like 

 that in the female. Parts of the fifth posterior, anal, and axillary 

 cells are not so dark as the remainder of the wings. The abdo- 

 men is black with gray posterior borders to the segment, and 

 three rows of faint triangles. The venter is yellowish with a 

 broad black stripe in the middle and less plainly marked narrow 

 spots on each side. 



Adams has stated that the male of this species was described 

 with some doubt by Williston, as the male of his pachycera. 



Chrysops sequax Williston. The species has somewhat the 

 aspect of umvittatus and striatus. Separated from the latter by 

 the hyaline triangle reaching or slightly transcending the second 

 longitudinal vein, and the apical spot entering the first posterior 

 cell. From the former by having four longitudinal black stripes 

 on the abdomen instead of two. 



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