248 THE CANADIA.N ENTOMOLOGIST. 



The following species of the group appear to be undescribed : 

 Tabaiius pruinosiis^ n. sp. 



Length lo mm. Colour black, opaque, the whole body having a 

 pruinose appearance. 



Female. — Front yellowish pollinose, clothed with rather short 

 yellowish hair ; frontal callosity, subcallous and ocelligerous tubercle 

 wanting ; face and cheeks yellowish pollinose and clothed with long white 

 hairs; palpi whitish; antennae yellowish, the first section of the third joint 

 of medium width, gently convex below and prominent above ; eyes 

 pubescent, unicolorous ; thorax dull black, clothed with long white hairs ; 

 wings hyaline, marginal cell dilute yellowish ; coxae and bases of all the 

 femora black, tips of tarsi brown, remainder of legs yellowish ; dark hairs 

 on all the legs have a tendency to make the legs appear dusky ; abdomen 

 black, very sparingly red on the sides of the first two segments, and 

 clothed with light hair, which usually is shorter than on the thorax. 



Male. — Differs from the female in having the abdomen more broadly 

 red on the sides — extending back on to the third segment. 



Five males and three females taken in central and northern Ohio in 

 June. 

 Tabanus thoraciais, n. sp. 



Length 9 mm. Thorax gray pollinose, abdomen piceus, yellow on 

 the sides. 



Female. — Front yellowish pollinose, clothed with short yellow hairs ; 

 frontal callosity and subcallous absent, occiput gray, face and cheeks 

 yellowish gray pollinose, clothed with rather short hairs, some of which 

 appear dark, almost black from some views ; antennje yellow, first section 

 of third joint narrow, as compared with bicolor, gently convex below, 

 prominent above ; thorax gray, clothed with white hairs ; legs yellow ; all 

 the femora darker at base, but this colouring is most apparent in the 

 middle pair ; last joint of all the tarsi brown, tibia? and tarsi clothed with 

 dark hairs, wings transparent, marginal cell and some of the longitudinal 

 veins yellow ; abdomen above piceous, yellow on sides of the first four 

 segments ; below a narrow, piceous stripe is present on the first three 

 segments, on each side of this stripe the first two segments are plain 

 yellow, and the apical part of the abdomen is variegated with piceous and 

 yellow. 



Male.— Differs from the female in having the basal half of all the 

 femora dark, and less yellow on the venter of the abdomen. 



Two females and a male collected at Oswego, N. Y., in August ; the 

 property of the National Museum. 



This species differs from bicolor, to which it is most closely related, 

 in its colour, smaller size and more slender form, and in the striking 

 difference in the form and width of the third antennal joint of the female. 



Mailed August 2nd, 1900. 



