114 NORTH AMERICAN TIPTJLIDAE 



Abdomen shining; dark brown above, tergites three to eight narrowly 

 edged with white posteriorly; sternites one to five or six, dark brown in the 

 middle, remaining sternites yellowish-brown; the lateral parts of tergites and 

 sternites sordid yellow, the seventh sternite emarginate in the middle, the 

 eighth very slightly emarginate. Hypopygium dull yellowish; the ninth 

 tergite very short; outer appendages lanceolate; ninth sternite entire with- 

 out median suture or incision; the pleural suture appears to be straight. PL V, 

 fig. 22. 



Holotype: cf ; Denver, Colorado. April 14, 1916. (E. J. 

 Oslar.) 



Closely allied to, yet very distinct from, P. oslari. 



Pachyrhina macrophallus spec. n. (PL IV, fig. 2; pi. VI, fig. 24.) 



Tipuloid. Yellow. Antennae of male elongated. Wings hyaline, stigma 

 fuscous. Penis of unusual length. 



Male. Length, 14 mm. — minus penis — ; wing, 13.5 mm. 



Head yellow. Mouth parts, sides of proboscis and palpi light brown, last 

 joint of the latter scarcely as long as the three preceding joints together; 

 frontal elongation and nasus shining, beset with black hairs which form a 

 pencil at the end of the nasus; remainder of head opaque, face pale yellow, 

 occiput with short, fuscous fine. Antennae long and slender, scapal joints 

 yellow, first flagellar joint yellowish-brown, rest of flagellum brown, besides 

 the incomplete verticles of long setaceous hairs at the base of segments, there 

 are many irregularly placed hairs, especially towards the base; pubescence 

 dense, pale; segments cylindroidal, slender. 



Thorax. Dorsum feebly shining, pale yellow; pronotal scutum brownish- 

 yellow in middle portion. Praescutal stripes reddish, the median stripe broad 

 and but little narrowed posteriorly, the lateral stripes narrower, not curved 

 anteriorly, leaving the lateral margin free and giving the thorax a margined 

 appearance, stripes very narrowly and indistinctly margined with brown. 

 The lateral stripes are continued upon the scutum, leaving the lateral margin 

 and the middle portion of the latter pale yellow. Scutellum and postnotum 

 darker reddish-yellow, lateral margin and median stripe of the latter, pale 

 yellow. Transverse suture tinged with pale brown in the middle. Pleura 

 reddish-yellow, whitish pruinose, a stripe along the sterno-pleural suture and a 

 few smaller spots pale yellow; the anterior and posterior ends of the pleuro- 

 dorsal suture, black. Halteres yellowish-brown, knob dark brown, apical 

 edge paler. Legs slender, yellowish, pubescense dense, coarse, blackish; femora 

 slightly, tibiae more markedly infuscate at the tip; tarsi blackish, the meta- 

 tarsi approximately as long as the tibiae. Wings entirely hyaline, stigma 

 brown, preceded by a white, hyaline spot, apical part of wings pubescent, cord 

 at base of cells R 2 and 3 and R 4 aod5 , infuscate, all the veins, except vein Cu, 

 more or less setulate. Venation as in figure. 



Abdomen yellow, a fuscous dorsal stripe, indistinct anteriorly, irregular, 

 more diffusive and darker posteriorly, an irregular row of black spots along 

 the margin of the tergites; venter, suffused with pale fuscous. The seventh 



