15° The Ohio Naturalist. [Vol. X, No. 6, 



1834, is a synonym but cannot be used here because of its 

 selection as a name for a genus of Coleoptera a year earlier. 

 Front rather wide, sides altogether parallel; frontal callosity 

 small, narrower than the front and without an extension above; 

 palpi flat shining black rather large and nearly spoon-shaped; 

 face ever}' where naked and shining black ; under side of the head 

 black and sparselv furnished with pale yellow hairs; antennae 

 entirely yellow, slender throtighout, third segment with a very 

 slight basal prominence, so slight in fact that it may be said to be 

 absent without being far wrong ; legs clear black except the tarsi 

 which are largely white; front tibia very much enlarged, middle 

 tibia smaller but still distinctly enlarged, hind tibia ciliate and 

 very slightly thicker than its femur; sides of the thorax black 

 with light brown hair; wing largely black, this color extending on 

 the costal side to the tip of the first vein and limited outwardly 

 by a rather irregular curved line from thence to the posterior 

 margin of the wing at the vein separated the third and fourth 

 posterior cells, fourth and fifth posterior and anal and axillary 

 cells largely nearly hyaline, black or the wing enclosing seven 

 more or less rounded small hyaline spots. 



Selasoma. Type species S. tibiale from South America. 

 Length about 14 millimeters, body shining blue-black, form 

 robust. The genus was erected by Macquart in 1838 to receive 

 Tabanus tibialis Fabr. Front narrow, sides clearly parallel; 

 frontal callosity small, not so wide as the front and with a dis- 

 tinct extension above reaching nearly to the vertex; palpi large, 

 thickened, reaching nearly to the end of the proboscis; face black, 

 thinly clothed with gray dust ; tinder side of the head clothed with 

 black hair; antennae not inserted on a prominence, black, first 

 and second segments small, third segment compressed, rather 

 wide and thin and the prominence which usually is near the 

 base here is located near the middle of the length; legs entirely 

 black and clothed with black hair, all the tibiae distinctly 

 enlarged but with a gradual decrease in size from before back- 

 wards; sides of the thorax black with black hair; black color of 

 the wing extending on the costal border to the tip of the auxiliary 

 vein and limited outwardly by a line drawn . nearly straight 

 backward from this point through the middle of the discal cell 

 to the apex of the apical cell ; the cells on the posterior part of the 

 wing are lighter in color and there is a distinct transverse hyaline 

 spot across the fourth vein before the base of the discal cell. 



Bolbodimvia. Type and only species of the genus B. bicolor 

 from South America. Length about 11 millimeters, body opaque 

 black, form rather slender. The genus was erected by Bigot in 

 1892 and described from a single specimen. So far as I am 

 aware onlv three specimens of the species have found their way 



