The Crane-Flies of New York — Part I 901 



A conspicuous feature occurring in the flies of this genus is the presence 

 of a fold in the first anal cell of the wing, which is most evident if the 

 wing is held against the light. 



Genus Teucholabis Osten Sacken 



1859 Teucholabis 0. S. Proc. Acad. Nat. Sci. Phila., p. 222. 



There are about forty-five described species in the genus Teucholabis, 

 two-thirds of which are from tropical America, the center of distribution 

 for the group. The larvae of T. complexa are found underneath decaying 

 bark, a habitat very like that of the related genus Elephantomyia. 



The local species of Teucholabis may be separated according to the 

 following key: 



Wing over 6 mm.; wings broad; Sc long, ending beyond two-thirds the length of the sector; 

 r inserted on Ri-ti; vein R2-t3 not upturned at its tip, the end of cell 2d Ri being much 

 broader than the end of cell R3; prescutuin reddish with three black stripes. fProc. 

 Acad. Nat. Sci. Phila., p. 223, pi. 3, fig. 10. 1S.59.] (Plate XXXIII, 52.) T. complexa 0. S. 



Smaller, wing under 5 mm.; wings narrow; Sc short, ending before midlength of the sector; 

 r inserted at or near the end of Rs; vein R2 + 3 upturned at the tip, the end of cell Ri 

 being broader than the end of eel! 2d Ri ; prescutum shiny black, only the humeral parts 

 of the sclerite light yellow. [Can. Ent., vol. 4S, p. 43. 191G. Proc. Acad. Nat. Sci. 

 Phila., p. 498, pi. 25, fig. 16. 1916.] (Plate XXXIII, 53.) T. lucida Alex. 



The vigorous, broad-winged T. co7nplexa is the northernmost local 

 species. 



Tribe Eriopterini 



The genera of the tribe Eriopterini may be separated in accordance 

 with the following key: 



1. Wings very much reduced, microscopic, very much smaller than the halteres. 



Chionea Dalman (p. 902) 

 Wings normally developed, much longer than the halteres 2 



2. Three branches of the media reaching the wing margin Cladura 0. S. (p. 903) 



Two branches of the media reaching the wing margin 3 



3. Ri shorter than Rz+s 4 



R2 longer than R1+3 7 



4. Radial cross- vein present 5 



Radial cross- vein tacking 6 



5. Rs elongate, longer than Ra+s, alone; tuberculate pits on the anterior part of the 



prescutum Rhabdomastix caudata (Lundb.) (p. 904) 



Rs shorter, not so long as Rt+i,; tuberculate pits retreated back on the prescutum. 



Erioptera, subgenus Empeda (p. 90S) 



6. Sc very long, extending to the end of the sector; basal deflection of Cui at the fork of 



M or beyond Rhabdomastix Skuse (p. 904) 



Sc short, not extending beyond midlength of the sector; if Sc projects beyond the base 

 of the sector, the basal deflection of Cui is far before the fork of M. 



Gonomyia Meig. (p. 904) 



