460 C. R. OSTEN SACKEN'S PRODROME 



Palisot's figure of the Iront of Lis T. sulpliureus shows the absence of the callosity, and 

 thus unmistakably points to T. mexicanus. 



B. Tabani with pubescent eyes, but without ocellar tubercle. 



39. Tabanus bicolor. 



Tabanus bicolor Wiedemann, Dipt. Exot., I, p. 96, 58 ; Auss. Z\v., I, p. 188, 115; mah. 

 Tabanus ruficeps Macquart, Dipt. Exot., 5"^ Suppl., p. 35, 130 ; male. 



Female. Eyes pubescent ; head comparatively broad ; face pale yellowish ; palpi short 

 and turgid, yellowish, with sparse, black hairs ; front and vertex yellowish ; no frontal cal- 

 losity ; antennoe reddish yellow, third joint remarkably broad and comparatively short. 

 Thorax brownish yellow, in consequence of the dense pollen which conceals the brownish 

 olivaceous ground color ; the j^leurjB somewhat grayish. Legs reddish yellow. Abdomen 

 reddish on the sides, yellowish brown in the middle and at the tip (the latter color being 

 the effect of a brown ground color covered with brownish fulvous pollen and fulvous hairs). 

 Wings hyaline ; veins yellow. 



Male. Head large, but not flattened on top ; large and small facets distinctly separated ; 

 thorax somewhat more yellowish than in the female, the yellow hair upon it being more 

 dense. Abdomen reddish yellow, with a dark longitudinal stripe, which is narrowest in the 

 middle, but varies in breadth in different specimens. Length, 10-11 mm. 



Ilah. New York ; Pennsylvania; Illinois; Canada. I have three male and two female 

 specimens before me. 



The male of this species is more frequently met with in collections than the female. 

 Although Macquart says "yeux nus " of his T. ruficeps,! have not the slightest doubt 

 that it is the same as T. bicolor Wied. 



40. Tabanus fulvescens. 



Tabanus fulvescens "Walker, List, etc., I, p. 171. 



"Mas. Fuscus, capite flavo-albido, thorace fusco, pectore cano, abdomine fulvo, fusco 

 nonnunquam vittato, pedibus flavis, alis hmpidis. 



" Head yellowish white, clothed beneath with white hairs ; feelers and palpi yellow ; 

 eyes red ; chest pale brown, clothed with tawny hairs : breast hoary, clothed with white 

 hairs ; abdomen tawny, slightly clothed with tawny hairs, and having a broad grayish brown 

 stripe, which appears only at the base of the underside ; legs yellow ; wings colorless ; 

 wing ribs and veins tawny, the latter piceous towards the tip ; poisers yellow. 



" Length of the body, 41 lines (11-12 mm.) ; of the wings, 9 lines. 



" a. Massachusetts. From Prof Sheppard's collection. 



"h. ? 



" Var. Abdomen not striped." 



I have two specimens (male and female) from Canada (Quebec, Mr. Belanger, and Port- 

 neuf, Mr. Provancher) which agree quite well with this description, except that, in the 

 male, the brown longitudinal stripe runs along the whole venter, and that the tarsi are 

 infuscated at the tips. The body of the female is darker ; the tips of the front tibiae are 

 infuscated; the front tarsi are brown, except at the base. 



