452 C. R. OSTEN SACKEN'S PRODROME 



that of T. costalis). Pleurte and pectus grayish. Abdomen Avith yellow longitudinal line, 

 expanding on the hind border of each segment, and thus forming a row of truncate trian- 

 gles ; on each side of this middle line there is a row of yellow spots, encircled in black ; 

 the size of the j'ellow spots goes on diminishing from the base to the tip ; the yellow re- 

 gions are clothed with a golden yellow pubescence ; the black ones with a black pubescence ; 

 (the black varies in intensity in different specimens; in my male specimen it is very faint, 

 the prevailing color of the abdomen being reddish 3'ellow). Prevailing color of the venter 

 yellow ; in well preserved specimens with a delicate whitish pollen. Front legs : coxsa yel- 

 lomsh white with long, soft white hairs ; trochanters brownish, femora brownish yellow or 

 yellowish brown, with a gray pollen ; tibiaj yellowish at the base, brownish on the latter 

 half; tarsi brown. Middle and hind legs: femora brownish yellow, with a gray pollen, 

 and with long, soft, whitish hairs ; tibiae yellow ; first joint of tarsi 3'ellow, brownish at tip ; 

 the following joints brown, 3'ellow at the base. The hind tiljias have a fringe of j^ellowish 

 hairs, and are more or less tipped with blackish ones. Wings sublij^iline, with but a very 

 slight grayish tinge ; costal cell tinged with yellowish ; stigma yellow ; the anterior branch 

 of the third vein rather knee-shaped near its origin; first posterior cell broadly open. 

 Length, 14-16 mm. 



Hah. Middle States ; Kentucky (Sanborn). A male and three females. 



Observation. One of the female specimens before me differs from the others in its col- 

 oring. The face has a yellowish gray tinge, while in the other specimens the face is of a 

 purer wdiitish gray ; the pleura? also are more yellowish gray instead of whitish gray ; the 

 palpi are decidedly yellow, with yellowish hairs on the stout, basal half, and with black 

 hairs on the slender portion of the second joint, while in the other specimens they are 

 whitish ; the femora are black, with a gray pollen, their tips yellow. I do not doubt the 

 specific identity of this specimen. The black design on the abdomen is sometimes very 

 fiiint (for instance, in the male specimen before me). 



This sjjecies has an unmistakable reseuiblance to T. co.siali.s in its coloring ; but it is con- 

 siderably larger, the markings on the abdomen are altogether different, the costal cell is 

 tinged with a less saturate yellow, the ? front is comparatively narrower ; the first joint 

 of the hind tarsi is ^^ellow, brown at tip in T.fulmilus and altogether blackish in T. costalis. 



27. Tabanus sagax n. sp. 



Female. Face white, with white down ; palpi rather stout, pale yellow, with short lalack 

 hairs ; antennas bright orange red ; third joint rather long, its annulate portion much 

 shorter than the body of the joint, deep black ; its upper angle very little projecting ; front 

 comparatively broad, nearly parallel, yellowish gray ; callosity broad, brownish, irregular, 

 nearl}^ square, rounded on top; above it another, oblong, denuded spot. Thorax light 

 gray, clothed with microscopic yellowish hairs ; pleura? and pectus whitish gray. Abdomen 

 reddish, more brownish towards the end ; a broad, conspicuous, whitish longitudinal stripe 

 along the back, expanded at the incisures ; on each side of the stripe a row of ill defined 

 yellowish white spots, a pair on each segment, growing smaller towards the tip of the abdo- 

 men; venter j^ellowish red. Legs reddish yellow; tips of front tibia? slightly infuscated ; 

 front tarsi and tips of the four posterior tarsi Ijrown. Wings hyaline ; veins yellowish ; 

 costal cell tinged with yellow ; stigma saturate yellow. Length, 13-15 mm. 



Hah. Illinois ; Minnesota. Tlu-ee females. 



