PSYCHE 



VOL. XIX. DECEMBER, 1912. No. 6 



NEW NEARCTIC TIPULIDAE (DIPTERA).' 



By Charles P. Alexander, 

 Ithaca, N. Y. 



The follownig crane-flies, received from various correspondents 

 during the past few months, are believed to be new to science. 



Limnobia axgenteceps sp. nov. 



Antennae 15-segmented; pleurae yellow, with a brown band; wings spotted; Sc 

 short, ending before the origin of Rs. 



cf , Length, 4.6 mm.; wing, 5.9 mm. 



Head: rostrum and palpi black; antennae 15-segmented, with the segments 

 all black, flagellar segments rounded-ovate; front, vertex and occiput black with 

 a conspicuous silvery-grey bloom; genae darker. 



Thorax: pronotum light brownish-yellow; mesonotum, praescutum: in front 

 and on the lateral margin, rather bright yellow; an indistinct broad, brown, median 

 stripe which spreads out behind and covers the entire sclerite before the suture; 

 scutum brown, paler, yellowish, medially; scutellum and post-notum brown. 

 Pleurae yellow, with a broad brown band extending from the cervical sclerites back 

 to the halteres and base of the abdomen. Halteres, pale at base; remainder, darker, 

 brown. Legs: coxae bright yellow; trochanters yellow; femora yellowish-brown, 

 darker toward the tip; tibiae and tarsi brown. 



Wings: hyaline, veins brown; a brown spot at the tip of Sc, extending around 

 the base of the sector; a large square stigmal spot; all cross-veins and deflections 

 of veins, narrowly marginal with brown; tip of the wing and ends of all of the veins, 

 faintly tinged with brown. Venation (See fig. 1): Sc short, Sc2 at the tip, end- 

 ing before the base of Rs; Rs rather square at its origin; basal deflection of Cu2 

 before the fork of M. 



Abdomen: tergum dark brown, the extreme apice of each sclerite and a broad 

 median patch on the base of segments 1 to 6, yellow; sternum mostly pale yellow, 

 the lateral margins and an indistinct, sub-apical, cross-band, brown. Hypopy- 

 gium yellowish: margin of the 8tli tergite almost straight; pleural pieces, cylin- 

 drical, thickly beset with stout hairs, bearing apically, a large pale segment which 

 is likewise beset with hairs, and armed at its tip with a slender, chitinized projec- 

 tion, curved at its ends; guard of the penis long, prominent, enlarged apically and 

 notched. 



' Contribution from the Entomological Laboratory, Cornell University. 



