118 NORTH AMERICAN TIPULIDAE 



Pachyrhina macrocera gnata subsp. n. 



The essential difference between this subspecies and true P. macrocera Loew, 

 consists in the cone-like prolongation of the eighth sternite of the male of the 

 former, while in true macrocera, the eight sternite is emarginate, while the 

 lateral angles of the emargination are prolonged in the form of digitiform 

 processes; of minor importance is the dark, yellowish-fuscous antennal 

 flagellum, the segments dark brown at base and the eighth and ninth ter- 

 gites of the male nearly entirely fuscous. 



Holotype: d" ; Beaver Falls, Wisconsin. August 4, 1909. 



Pachyrhina macrocera atrocera var. nov. 



Agrees in habitus and structural details with true macrocera, but is some- 

 what more somber in appearance. The antennal flagellum is entirely dark 

 brownish black. The seventh abdominal segment apically, the eighth seg- 

 ment and the ninth tergite entirely brown. Structurally, the eighth sternite 

 and hypopygium do not appear to differ from the typical form. 



Holotype: cf ; St. Johns, Pennsylvania. July 5, 1917. (W. G. 

 Dietz.) 



Pachyrhina hirsutula spec. n. (PI. IV, fig. 4.) 



Appearance and habitus of P. macrocera Loew. Wings sparsely hairy. 



Male. Length, 11.5 mm.; wing, 12.5 mm. 



Head yellow; proboscis shining, sides, mouthparts and palpi brown, joints 

 three and four of the latter yellowish-brown, the last joint of moderate length. 

 Antennae long, joints one to three yellow, the third joint nearly twice the 

 length of the two preceding joints together. Joints four and five yellowish- 

 fuscous, remainder dark fuscous; pubescence dense, whitish; verticels of 

 blackish setae at base of segments; occiput opaque, a minute fuscous dot 

 above each eye. 



Thorax opaque, dorsal stripes obscure; pleura pale yellow, no markings. 

 Scutellum and postnotum with same luster. Halteres pale yellow, club infus- 

 cate, pale at apex. Legs slender, yellow, femora and tibiae slightly darker at 

 the apex, outer tarsal joints infuscate, the metatarsi shorter than the tibiae; 

 pubescence very short, blackish, appressed. Wings hyaline, with faint grayish 

 tint, costal cells yellowish, stigma pale fuscous, costo-apical portion infuscate; 

 surface beset with moderately long, very fine, scattered hairs; costal veins, 

 vein R and all veins beyond the cord, except those which limit cell 1st M 2 , 

 markedly setulose. Venation as in figure. 



Abdomen yellowish-testaceous, shining, brown towards the caudal end, 

 lateral and ventral rows of black spots. Eighth sternite blackish at base, 

 deeply emarginate with a digitiform process from the base of the emargination, 

 the lateral angles of the emargination prolonged into an acute angle. Hypo- 

 pygium dark testaceous, appendages pale yellow, the outer appendages elon- 

 gate lanceolate, curved ventrad; inner appendages cone-like and ending in a 

 drawn out point ; ninth tergite a trifle wider than long, broadly but not deeply 

 impressed anteriorly, sulcate posteriorly, margin narrowly emarginate in the 

 middle. 



