OF THE TABAXID^ OF THE UNITED STATES. 453 



Not unlike T. fuli'ithis in the markings on tlie abdomen ; Imt the markings, as well as 

 the thorax, are grayish, instead of fulvous ; the front is much broader, the frontal callosity 

 larger ; the third antennal joint is narrow, its upper angle but very little projecting ; the 

 dorsal stripe on the abdomen comparatively broader. 



The cyeri of T. sdrjra: have a ^^^^I'ple band between two green ones, above and below 

 wdiicli there is, on each side, another less well defined, purple band. 



28. Tabanus nigrescens. 



Tabanus iiigrcscens Palisot-Benuvois, Ins., Dipt. Tab. II, f. 2; Wieilcmunn, Auss. Z\v., I, p. IIG, G. 



Male and female. Head of the male more convex than that of the female ; large and 

 small fleets distinctly se^sarated ; frontal callosity (?) much longer than broad, convex, 

 black or dark brown, with a spindle-shaped prolongation above. Front grayish brown, 

 brown in tlie middle ; face l)rownish gray ; cheeks with dark brown or black hairs ; j^alpi 

 black ; antenn;c black; base of the third joint red ; its projecting angle almost rectangular. 

 Thorax brown (of a more reddish brown in the female than in the male), with a faint 

 grayish pollen anteriorh" ; no distinct stripes. Abdomen altogether black ; legs black. 

 Wings with a yellowish brown tinge, which is more saturate in the two basal cells ; costal 

 cell Ijrownish (sometimes the wings have an altogether blackish tinge) ; stigma ferruginous 

 brown ; a blackish cloud on the crossvein between the discal and the second posterior 

 cell, usually more or less extending over the crossvein next to it ; a round, blackish cloud 

 on the bifurcation of the third vein. Length, i , 20 mm. ; 5 , 22-23 mm. 



Hah. New York (C'atskill Mountain House, July, 1874) ; Massachusetts; New Jersey; 

 Pennsylvania ; Maryland ; Illinois ; Knoxville, Tennessee ; a specimen ( ? ) from Canada 

 (Mr. W. Saunders) is smaller, and has very dark, almost blackish wings. 



The ej'es (?) are dark and dull green, with three narrow purple bands, the U23per one is 

 distinct at the beginning only. The description of Palisot, brief as it is, cannot be doubtful 

 in its interpretation, especially with the addition of the figure of the whole insect and its 

 antenna?. 



29. Tabanus punctifer ii. sp. 



Tahamis pwicti/cr Locw in litt. 



Ifale and female. Head ( i ) large, with distinctly separated large and small facets ; 

 front ( ? ) broad (broader than in T. nigrescens) ; frontal tubercle large, somewhat ill 

 defined in outline and rather flat ; antennie black, projecting angle of the third joint rect- 

 angular ; face brownish ; palpi l)lack. Thorax and scutellum, above, whitish or yellowish 

 white, in consequence of a dense pollen, covered by a pubescence of the same color ; 

 pleura3, pectus, abdomen and legs black, or dark brown ; front tibire white at the base for 

 more than one third of their length. Wings brownish, especially on their proximal half; 

 costal cell brown ; a fiiint brown cloud on the crossvein at the base of the second posterior 

 cell, wdiich is not prolonged on the crossvein at the base of the third posterior cell ; a dark 

 brown round cloud at the bifurcation of the third vein. Length, S , 19 mm. ; ? , 19-20 mm. 



Hah. West of the Rocky Mountains ; Utah, Sonora, California, etc.; also Colorado 

 (G. Eidings) ; seems to be a common species. 



This species is not unlike T. styfjlus Say, but is a little smaller, and easily distinguished 



MEMOIRS BOST. SOC. NAT. HIST. 



