88 Annals Entomological Society of America [Vol. XII, 



Tipula monochroma spec. n. 



Yellowish. Antennal flagellum tmicolorous, fuscous. Thoracic 

 dorsum brownish-yellow, dull. Prolongation of pleurite straight, 

 stilletto-like, hairy. 



Male. Length 11 millimeters; wing 12.5 millimeters. 



Head concolorous; front and occiput gray, with a fine, dark median 

 line. Frontal prolongation long, shining and like the nasus above, beset 

 with short, blackish hairs. Palpi sordid yellow, last joint infuscate and 

 scarcely longer than the preceding joints together. Antennae moderate, 

 the three basal joints yellowish, the remainder fuscous; segments sub- 

 cylindrical, the basal enlargement blackish, each with a whorl of black, 

 moderately long setae. 



Thoracic dorsum brownish-yellow; pronotal scutem darker about 

 the middle. Praescutal stripes ill-defined by fine, paler lines. Scutum, 

 scutellum and postnotum semiopaque, slightly more infuscate and 

 somewhat sericeous. Pleura pale yellowish, sericeous. Legs yellowish, 

 outer tarsal joints infuscate, the whole leg beset with coarse, short 

 black hairs. Halters pale, club infuscate. Wings pale grayish; costal 

 cells very pale yellowish; stigma pale, slightly infuscate. The ante- 

 stigmal spot inconspicuous, extends through cell 1st M2 to base of 

 cell M3, and sending a narrow, pale streak to the wing margin. The 

 veins included in the antestigmal spot are whitish. Veins R and Sc. 

 yellow, the other veins dark brown and delicate. The veins beyond 

 the cord are indistinctly margined with subhyaline. The R, s, and the 

 veins beyond the cord, except those limiting cell 1st M2, setulose. 



Abdomen darker yellow, almost testaceous, shining; an ill-defined, 

 more or less interrupted, fuscous dorsal stripe; tergites three to seven 

 with a fuscous spot near the anterior angle and from which extends an 

 indistinct streak along the lateral margin of the tergite. Venter with 

 median blackish stripe, somewhat interrupted and obsolete beyond the 

 fourth sternite. The eighth sternite projecting, narrowed posteriorly, 

 the apical margin nearly truncate, with a brush of stiff, yellowish- 

 fuscous, incurved bristles. Hypopygium (PI. V, Figs. 7 and 8) 

 dark testaceous, medium sized. The ninth tergite broad, slightly 

 narrowed posteriorly, the free margin with small V-shaped, median 

 notch, emarginate each side, the apical angles curved downwards. 

 Ninth sternite with a rather deep, V-shaped emargination, from which 

 projects a pencil of stiff bristles, lateral angles with a small appendage, 

 beset with bristles. Pleural suture distinct. The pleural process 

 has the shape of a stilletto, beset with hairs. The outer appendages 

 are yellowish-white, membranous, bilaminate, somewhat protuberant 

 and acuminate; the inner lamina beset with bristles, directed inwardly. 



Holotype, cf, Chimney Gulch, Golden, Colorado, (E. J. 

 Oslar). 



Paratype, cf , Silver City, Nevada, June 3rd, 1913. 



The paratype is paler than the holotype; tlie dark markings 

 of the abdomen, with the exception of the lateral spots, nearly 

 obsolete. The hairy stiletto-shaped pleural process of the 

 male will readily distinguish this species. 



