136 NORTH AMERICAN TIPULIDAE 



lar whitish stripe extends from the upper part of the sternopleura to the meta- 

 pleura and margin of the postnotum. Halteres dark yellowish at base, brown- 

 ish towards and including the club. Legs very slender, pale yellowish, meta- 

 tarsi pale fuscous, rest of tarsi darker; pubescence very short, black; tibiae a 

 little longer than the metatarsi. Wings entirely hyaline, stigma with faint 

 tinge of brownish. Cell M 1 rather broadly sessile. Veins C, Sc. and R, 

 jy[i. 2 and 3 very finely setulose. PI. V, fig. 18. 



Abdomen yellow. Tergite two with a brown spot anteriorly, posteriorly 

 similar to tergites three and four with two, brownish, dorsal lines, tergites five 

 to eight, tinged with pale brown; venter a shade paler. Ovipositor yellow, 

 dorsal valves, long and narrow, ventral valves rather short, lanceolate, pointed. 



Holotype: 9 ; South Park, Colorado. June 17, 1916. (E. J. 

 Oslar.) 



An isolated form. The dark ferruginous head is in strange con- 

 trast to the general yellow color. From its nearest allies, P. 

 suturalis Loew and abbreviata Loew, it is distinguished by the 

 entirely hyaline wings and almost colorless stigma. 

 Pachyrhina approximata spec. n. (PL V, fig. 19; pi. VII, fig. 33.) 



Antennae of male long, flagellar joints fuscous, ferruginous at base — except 

 outer joints. Occiput shining with brown stripe. Thoracic stripes ferrugi- 

 nous-brown. Abdomen with black lateral stripes, segments margined with 

 fuscous posteriorly. 



Male. Length, 12 mm.; wing, 12 mm. 



Frontal prolongation dark yellow, shining, with two, brown, dorsal fines and 

 beset with black hairs; sides of proboscis brown at base; mouthparts and 

 palpi yellowish-brown, first palpal joint yellow at base. Face yellow with a 

 brown, triangular spot. Antennae slender, extended back they reach beyond 

 the base of the abdomen; scapal joints light ferruginous, flagellar joints brown, 

 joints two to seven ferruginous at base, emarginate beneath, verticels incom- 

 plete, setae shorter than the respective joints; pubescence dense, whitish. 

 Occiput ferruginous, shining with dark brown, median stripe. Neck brown. 



Thorax shining above, yellow. Pronotal scutum and scutellum opaque, the 

 the former brownish in the middle and a spot on the sides.. Praescutal stripes 

 dark brown anteriorly, ferruginous posteriorly, the middle stripe strongly nar- 

 rowed posteriorly. Scutum sulphur yellow with a ferruginous stripe each 

 side and a similar spot within the alar insertion. Scutellum ferruginous. 

 Postnotum sulphur yellow, with median line and posterior declivity light 

 ferruginous. Pleura sulphur yellow; intercoxal part of sternopleura, lower 

 half of mesopleura, and metapleura posteriorly, ocherous-ferruginous. Middle 

 portion of transverse suture tinted blackish. Legs long and slender, yellowish- 

 brown, femora and tibiae infuscate apically, tarsi fuscous, metatarsi markedly 

 longer than the tibiae, pubescence dense, coarse, blackish. Halteres brownish- 

 yellow, apical half of club dark brown. Wings grayish, costal cells and margin 

 of vein Cu and Cu 1 tinted yellow, stigma yellowish with faint brownish tint; 

 cell M 1 sessile. Costal veins, vein R and veins M 1 ' 2 and 3 setulose. Venation as 

 in figure. 



