116 NORTH AMERICAN TIPULIDAE 



two larger, fuscous, approximate spots at the base of the occiput, two very 

 minute dots at the base of the neck and a larger, black spot each side of the 

 neck. 



Thorax sordid yellow. Pronotal scutum fuscous on the sides, scutellum 

 pale fuscous, whitish anteriorly; praescutal stripes grayish-pruinose, wide, 

 heavily marginecf with brown, the middle stripe divided by an indistinct yel- 

 lowish line. Scutum with two large, coalescent, grayish- pollinose spots, mar- 

 gined with brown. Scutellum testaceous, shining. Postnotum pale yellow, 

 shining, sides yellowish-fuscous, posterior declivity blackish. Pleura pale 

 yellow with a whitish sheen; inferior half of sternopleura, lower half of meso- 

 pleura and some .spots, grayish-fuscous. Coxae yellow, the anterior and mid- 

 dle pair anteriorly, the posterior pair on the sides, streaked with dark brown. 

 Legs moderately slender, femora and tibiae yellowish-brown, darker at the 

 apices; tarsi fuscous, metatarsi shorter than the tibiae, the whole leg beset 

 with a very short, appressed, black pubescence. Halteres brownish, base 

 paler, knob fuscous, white at tip. Wings grayish, cells C and Sc fuscous, 

 stigma pale fuscous, vein Cu margined with fuscous, a faint, hyaline spot 

 before the stigma, a similar spot at distal end of cell R, extending through 

 cell 1st M', into M^, the veins included in this spot are pale. Costal veins 

 and vein R setulose. Venation as in figure. 



Abdomen sordid yellow, shining, without stripes or rows of spots. Eighth 

 sternite slightly emarginate. Hypopygium concolorous; ninth tergite brown- 

 ish at the base, narrowed posteriorly, deeply impressed about the middle and 

 the posterior margin with a semicircular emargination ; the outer appendages 

 lanceolate, acuminate; median suture of ninth sternite open; pleural suture 

 curved upward anteriorly. 



Holotype: cf ; Clear Creek, Colorado. September 12, 1916. 

 (E. J. Oslar.) 



Paratype: cf ; Leadville, Colorado. September 1, 1914. 

 (A. K. Fisher.) 



An isolated form, not closely related to any other species 

 known to me. The Radial sector is shorter and more arcuated 

 than usual in this group. The Leadville specimen, has cells C 

 and Sc yellowish; and the ninth tergite is not brown at the base. 



Paratype in the collection of the United States Biological 

 Survey. 



Pachyrhina perdita spec. n. 



Yellow. Occiput with shining triangle. Thoracic stripes black, the lateral 

 stripes curved outward and ending in an opaque, black spot. Wings hyaline, 

 stigma black. Cu and crossvein M-cu before the fork of M. 



Female?. Length — to end of seventh abdominal segment — 15 mm.; wing, 

 14.5 mm. 



