THE CANADIAN ENTOMOLOGIST 197 



Paratopotypes. — 2 d^'s. 



The type is in the collection of Cornell University. 



Tipula, ludoviciana is allied to, and superficially resembles, T. sayi Alex. 

 {costalis Say) which has the antennae of the male short, about reaching the 

 base of the abdomen; no dark seam albng the vein Cu; the petiole of celjl M\ 

 much shorter, and the colorational and hypopygial details different. 



This new species of Tipula has the male antennae of a length that is quite 

 unique among the known nearctic species of the genus, but which is equalled 

 or exceeded in certain exotic forms. 



Tipula plutonis, new species. 



Similar to T. coracina Alex, of northern Alaska; general coloration gray, 

 the praiscutal stripes darker; wings almost clear; abdomen dark gray with the 

 lateral margins of the tergites broadly yellowish; male hypopygium very simple 

 in structure, the nintli tergite broadly transverse, the posterior margin almost 

 straight across with a tiny V-shaped median notch; outer pleural appendage 

 very large and tumid, working transversely across the genital chamber; ninth 

 sternite with a deep, V-shaped notch. 



Male. — ^Length 10.5 mm.; wing 11.5 mm. 



Frontal prolongation of the head dark brown, the nasus distinct; mouth- 

 parts dark brown. Antennae short, the basal segments paler brown, the flagellum 

 dark brown throughout; segments of the flagellum short-cylindrical with the 

 terminal sweljiing about equal to the basal enlargement, the segments but feebly 

 constricted at midl^^ngth. Head light gray, more obscure posteriorly. 



Mesonotal praescutum dark gray with four indistinct dark brown stripes, 

 the median pair very indistinctly divided by a capillary line. Remainder 

 of the mesonotum dark gray, the scutal lobes indistinctly marked with brownish. 

 Pleura gray, the dorso-pleural membranes more yellowish. Halteres yellowish 

 brown, the knobs dark brown. Legs with the coxae dark gray, tipped with 

 paler; trochanters yellowish, tipped with blackish; remainder of the l)3gs broken. 

 Wings subhyaline or ver\' pale grayish ; stigma distinct, brown ;a distinct obliter- 

 ative streak extending from before the stigrna through cell 1st M^; veins dark 

 brown. Venation: Rs almost straight; cell Mi very deep, the petiole short, 

 about equal to a or a little less than r-m; cell 1st Mi pentagonal; m-cu obliterated 

 by the punctiform contact of Cm on Mz+i. 



Abdomen dark gray, the lateral margins of the tergites broadly yellowish, 

 the posterior margins of the tergites and sternites very narrowly and indis- 

 tinctlV ringed with silvery. Male hypopygium of very simple structure. Ninth 

 tergite flattened, broadly transverse, almost rectangular, the posterior margin 

 almost straight across and with a minute median V-shaped notch. Ninth 

 pleurite very extensive, the suture indicated by a distinct curv^ed ISne beneath, 

 the proximal ventral angle narrowed and tufted with a few long, silky hairs. 

 Outer pleural appendage very large and tumid, the ventral face blackened, 

 the surface of the appendage covered with a few short appressed hairs; inner 

 pleural appendage represented by a small flattened, subcircular lobe. The 

 pleural appendages work across the genital chamber after the fa.shion of the 

 Limnobiini, not against the ninth tergite as in most species of the genus. Ninth 

 sternite profound h' notched by a narrow, V-shaped incision. Eighth sternite 



