224 The Ohio Naturalist. [Vol. VIII, No. 2, 



Tabanus quinquemaculatus n. sp. Length 12 millimeters. 

 A black species with gray striped thorax and a small white 

 triangle on the middorasl line of each of the first five abdominal 

 segments. The general aspect is that of a small specimen of 

 Tabanus coffeatus. 



Female. Front of ordinary width, clothed with white dust 

 below and dark dust and black hairs above ; frontal callosity shin- 

 ing black; about half as wide as the front and connected with a 

 rather short narrowed extension above ; antennae entirely black, 

 first segment enlarged and somewhat produced at the anterior 

 upper corner, third segment cut out above so that a distinct but 

 not an elongate tooth is formed at the base. Palpi light colored 

 and clothed with black hairs. Thorax black above with rather 

 narrow gray stripes; wings hyaline, although there is a brownish 

 tinge visible over much of the basal half; legs black, basal two 

 thirds of the middle and hind tibiae reddish brown. Abdomen 

 black, posterior margin of each segment narrowly white expand- 

 ing into a small white triangle in all but the last two. Much of 

 the body, especially the under parts, is clothed with sparse 

 hairs. 



Female taken near Morales, Guatemala, March 3, 1905, where 

 it was resting on a freight car. 



Tabanus nefarius n. sp. Length 22 millimeters. General 

 color brown, wings brown, margins of the transverse veins and 

 the furcation of the third vein infuscated. Abdomen with a 

 middorsal row of gray triangles, each of which connects with a 

 grayish yellow posterior border of its respective segment. 



Front rather narrow, sides parallel, frontal callosity light 

 brown, a little narrower than the front, slightly elongated and 

 connected above with a narrow line, which reaches above the 

 middle of the front. Space just above the antennae and the 

 cheeks clothed with yellow dust, face below the antennae clothed 

 with lighter dust. Antenna light brown with the annulate por- 

 tion of the third segment darkest; first segment rather long 

 clothed with black hairs which are most conspicuous above, 

 second segment with conspicuous black hairs at apex, third seg- 

 ment elongate with a prominent tooth above, basal portion much 

 longer than the annulate portion ; palpi concolorous with the an- 

 tennae, nearly as long as the proboscis which is black. Thorax 

 with rather indistinct gray stripes, legs of nearly the same color 

 as the body ; front femora, apexes of front tibiae and all the tarsi 

 slightly darker than the other parts ; wings uniform brownish with 

 infuscated margins to the transverse veins and the furcation of 

 the third vein, first posterior cell closed or nearly closed. Abdo- 

 men, in well preserved specimens, brown with a middorsal row 

 of rather small gray triangles and rather wide grayish yellow 

 posterior margin to each segment. 



