452 C. R. OSTEN SACKEN'S PRODROME 



that of T. costcdis). Pleura? and pectus grayish. Aljdomen with 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 Ijlack ; 

 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 intensit}^ in different specimens; in my male specimen it is very faint, 

 the prevailing color of the abdomen being reddish yellow). Prevailing color of the venter 

 yellow ; in well preserved specmiens with a delicate whitish pollen. Front legs : coxa3 3'el- 

 lowish white wdth long, soft white hairs ; trochanters brownish, femora brownish yellow or 

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

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

 and Avith long, soft, wliitish hairs ; tibice yellow ; first joint of tarsi yellow, brownish at tip ; 

 the following joints brown, yellow at the Ijase. The hind til)ia3 have a fringe of yellowish 

 hairs, and are more or less tipped with blackish ones. Wings suljhyaline, 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-lG mm. 



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



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

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

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

 palpi are decidedly yellow, Avith yelloAvish hairs on the stout, basal half, and Avith black 

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

 Avhitish ; the femora are black, Avith a gray pollen, their tips yclloAV. I do not doubt the 

 specific identity of this specimen. The Ijlack design on the aljdomen is sometimes veiy 

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



This species has an unmistakable resemblance to T. cofttalis in its coloring ; but it is con- 

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

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

 of the hind tarsi is yellow, brown at tip in T. fulvulus and altogether blackish in T. costalis. 



27. Tabaniis sagax n. sp. 



Female. Face white, Avith white down ; palpi rather stout, pale yellow, Avith short black 

 hairs ; antenna? 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, 

 nearly square, rounded on top; above it another, ol^long, denuded spot. Thorax light 

 gray, clothed with microscopic yelloAvish hairs ; pleura? and pectus Avhitish gray. Abdomen 

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

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

 yellowish Avhite spots, a pair on each segment, groAving smaller towards the tip of the aljdo- 

 men; A-enter j'ellowish red. Legs reddish 3'elloAV ; tips of front tibia? slightly infuscated ; 

 front tarsi and tips of the four posterior tarsi broAvn. Wings hyaline ; veins yelloAvish ; 

 costal cell tinged Avith yelloAV ; stigma saturate yelloAV. Length, 13-15 mm. 



Hah. Illinois ; Minnesota. Three females. 



