122 NORTH AMERICAN TIPULIDAE 



dark brown spot in the middle of the median pale stripe; outer part of trans- 

 verse suture and its continuation in the pleuro-dorsal suture before the alar 

 insertion, deep velvety black. Scutel yellowish-brown, shining. Postnotum 

 deep yellow, opaque, brownish along median line and posteriorly. Pleura 

 pale yellow with a whitish sheen, lower half of mesopleura ochraceous, a spot 

 in upper portion and several other spots more or less distinct, dark fuscous. 

 Halteres sordid- white, paler at base, knob infuscate, apex white. Wings 

 broad, lightly tinted with gray, basal part yellowish, costal cells brownish- 

 yellow, stigma brown, apex infuscate, cord at base of cells R 2 and 3 and 4 and 5 

 slightly infuscate. Vein C, Sc, R and its branches, and M 1, 2 and 3 more or 

 less distinctly setulose. Venation as in figure. Legs yellowish, pubescence 

 dense, short and black, femora and tibiae blackish towards the apices, tarsi 

 fuscous, metatarsi about as long as the tibiae. 



Abdomen deep yellow, shining, tergites two to six each with a large, brown 

 spot, segment seven nearly, the eighth segment entirely, blackish, lateral mar- 

 gins of tergites indistinctly blackish; venter pale; eighth -sternite scarcely 

 emarginate. Hypopygium brown; ninth tergite blackish, very small, bifov- 

 eate posteriorly, emarginate in the middle; appendages pale yellow, the outer 

 appendages elongate-lanceolate, incurved, the inner appendages claw-like, 

 curved upwards, their apices projecting under the curved ends of the outer 

 appendages; a carina-like process projects from the suture of the ninth sternite. 



Female. Length, 18 mm; wing, 12 mm. 



Very similar to the male. Antennae scarcely shorter, lighter yellow. Ovi- 

 positor ferruginous; upper valves narrow, obtusely rounded at apex, lower 

 valves two-thirds the length of the upper, broader, rounded at apex. 



Hole-type: cf ; Floodwood, Schoolcraft County, Michigan. 

 July, 1915. (J. S. Rodgers.) 



Allotype; 9 ; topotypic. 



Paratypes : five males and 7 females, topotypic ; two females, 

 Plummer's Island, Maryland, June 8, 1913, (A. Wetmore) and 

 July 14, 1907, (A. K. Fisher). 



A very distinct species. From those species having the tho- 

 racic stripes not black and the lateral stripes bent outward and 

 ending in a black, opaque spot, it differs, among other charac- 

 ters, from P. punctum Loew in its occipital line, and from P. 

 wulpiana Bergroth in the absence of a shining triangular spot; 

 from P. opacivittata, montana, evasa and nexilis in the bicolored 

 flagellar joints. Specimens in which the pruinosity of the tho- 

 racic stripes has been abraded, there have a ferruginous color. 

 Two paratypes are in the United States Biological Survey col- 

 lection, and a male and a female specimen in Mr. Alexander's 

 collection. 



