126 NORTH AMERICAN TIPULIDAE 



dark yellow, inf uscate apically, tarsi fuscous, metatarsi longer than the tibiae ; 

 pubescence very short, blackish. Wings hyaline, costal cells faintly yellow, 

 stigma dark brown, basal section of R 4 and 5 , cross vein R-M and apex of wing, 

 infuscate. Costal veins and vein R and M 1,2and3 setulose. Venation as in 

 figure. 



Abdomen dark yellow, feebly shining, basal part whitish; a broad, not 

 sharply defined dorsal stripe, more or less interrupted at the sutures, dark 

 brown anteriorly, paler posteriorly; seventh and eighth segments almost 

 entirely blackish; a pale fuscous, ill-defined, lateral stripe; eighth sternite 

 slightly emarginate, fringed with long, yellow hairs. Hypopygium; ninth 

 tergite dark ferruginous, wider than long, the lateral angles somewhat promi- 

 nent, posterior border emarginate on the sides and in the middle, a median 

 impressed line; rest of hypopygium ferruginous; outer appendages pale yel- 

 lowish, very narrowly lanceolate, attenuated outwardly; inner appendages 

 claw-like, curved upward; between these two appendages is a dark brown, 

 acutely triangular process, pleural suture fine, straight, not curved upward in 

 front; from the rfiiddle of the suture of the ninth sternite projects a pear- 

 shaped strongly, chitinized appendage, the narrowed end free, dark brown, 

 projects downward. 



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

 (E. J. Oslar.) 



Paratypes: one male, topotypic, July 26, 1915; two males, 

 Bear Creek, Morrison County, Colorado, August 23, 1916. 



Quite distinct from the other species. For differentiation from 

 allied species see under P. calinota. The three linear fuscous 

 spots of the vertex distinguish this species from all others of this 

 group. In two of the paratypes, the lateral thoracic stripes are 

 entirely ferruginous. 



Pachyrhina festina spec. n. (PI. V, fig. 12.) 



Pale yellow. Flagellar joints unicolorous, basal joints yellow, outer joints 

 yellowish-fuscous. Occiput shining. Wings with yellowish tint, stigma 

 brown. Abdomen with lateral row of black strigae. 



Male. Length, 12.5 mm.; wing, 12.5 mm. 



Head pale yellow. Frontal prolongation lustrous, lightly touched with 

 brown anteriorly, nasus beset with pale hairs; mouth parts fuscous; palpi 

 yellowish-fuscous, the two outer joints paler, the last joint scarcely longer 

 than the three preceding joints. Proboscis short, sides brown. Antennae of 

 moderate length, very slender, scapal joints and basal joints of flagellum yel- 

 low, outer joints brownish-yellow, cylindrical, pubescence fine, dense, whitish, 

 the hairs of the basal verticels as long or longer than the respective joints. 

 Face and front opaque. Occiput shining, sordid yellowish, with a large, tri- 

 angular spot which is a shade darker. 



