The Ohio Naturalist. 
[Vol.X, No. 6, 
I 5° 
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 everywhere naked and shining black ; under side of the head 
black and sparsely furnished with pale yellow hairs; antennae 
entirely yellow, slender throughout, 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, 
thinlv clothed with gray dust; under 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. 
Bolbodimyia. 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 only three specimens of the species have found their way 
