DIPTERA 



403 



successively slightly shorter, each slightly constricted near the middle, 

 bearing a whorl of bristles near the base, the seventh joint over three 

 times as long as wide ; antennieof female almost reaching base of wing, 

 considerably tapering to the apex, formed as in the male except that 

 the joints beyond the fifth are not constricted in the middle, the 

 seventh joint less than twice as long as wide; thorax bare, black, 

 opaque, gray pruinose, a yellow vitta extending from below each hume- 

 rus to root of wing and from thence to the scutellum, sending a branch 

 downward behind the front coxa ; the three usual vittae are concolor- 

 ous with the mesonotum, each margined with black, the two black 

 lines bordering the median vitta straight, anteriorly diverging, their 

 anterior ends widely separated, a brown vitta midway between them, 

 which is sometimes almost obsolete ; scutellum brown, gray pruinose, 

 its margin and lower side yellow; metanotum black, gray pruinose, 

 the sides spotted with yellow; abdomen bare, yellow, a black vitta 

 on each side of the middle ; male hypopygium large, black, the apex 

 and under side yellow, ventral portion of the preceding (eighth) ab- 

 dominal segment bearing sparse, short, black hairs; claspers almost 

 square, each bearing near the apex of the inner side a pair of spatulate 

 organs which are about as long as the clasper, the upper pair converg- 

 ing, the lower one curving outward ; dorsal piece of hypopygium at 

 middle of its posterior margin bearing a pair of conical, blunt-pointed, 

 backwardly projecting processes which are more than one-half as long 

 as the dorsal piece ; ovipositor black at its base, the remainder yellow, 

 nearly as long as the second abdominal segment, the upper pair of 

 sheaths tapering to their middle, then of nearly an equal width, not 

 crenulate, the apex bluntly rounded ; wings pale grayish, costal cell 

 yellowish, auxiliary vein yellow, the others brown, stigma brown, a 

 white spot before its base, a less distinct one beyond its apex and a 

 similar one in base of discal cell, this cell more than twice as long as 

 wide ; legs yellow, apices of femora and of tibiae black, tarsi chang- 

 ing into black at its apex ; halteres brown, the bases yellow. Length 

 of male, 14 mm. ; of female, 18 mm. Two males and one female. 



Habitat. — Metlakahtla, June 4; Sitka, June 16; Yakutat, Alaska, 

 June 21. 



Type. — Cat. no. 5205, U. S. National Museum. 



Tipula tenebrosa sp. no v. 



Same as the above description of strigata with these exceptions : 

 Front and occiput destitute of a median black vitta, rostrum brown, 

 the under side yellow, third joint of antennae wholly black, antennic 

 of male not reaching beyond base of abdomen, the third joint bearing a 



