409 ENTOMOLOGICAL NEWS [NoV., '13 



This remarkable genus of flies is apparently confined to the 

 tropics of South Ainerica. Specimens are rare in collections 

 and the few that have been taken are all contained in Euro- 

 pean museums. The peculiar characters of the genus, for the 

 most part alar and venational, are thoroughly discussed by 

 C^sten Sacken in the second part of his "Studies on Tipulidje" 

 ( Berl. Ent. Zeitschr., vol. 31, pp. 174-177). The present col- 

 lection contained specimens of four species of which three are 

 herein considered as new. 



Key to the Species of Periphcroptera. 



1. Cell 1st M2 open; [thorax black shining; inner end of cell 7?3 an- 



terior to that of cell Rs] (Brazil, Bolivia). 



incommoda O. S. (l) 

 Cell 1st A/2 closed, i. e., crossvein m present 2 



2. Body color shining pitch black 3 



Body color more or less reddish or yellowish 4 



3. Inner ends of cells i?3, /?5 and \st A/2 about in a straight line; 



femora yellow basally darkening into brown at the tip. 



(South America) aberrans Schin. (2) 



Inner ends of cells Rt, and 1st M2 much farther pro.-timad than the 

 inner end of cell Rs; legs black. (Peru). 



teucholaboides sp. n. 



4. Wings conspicuously margined with brown all around ; a broad 



brown seam along the cord; [cell \st M2 elongated; inner 

 ends of cells /?3, Rs and i.j( A/2 in a line.] (Peru). 



cudorac sp. n. 



Wings hyaline or suffused with yellowish ; no distinct brown caudal 



margin to the wing 5 



5. Inner ends of cells A'3, R5 and l.5( A/2 nearly in a line. (Brazil). 



schineri O. S. (3) 

 Inner ends of cells R3, Rs and 1st A/2 not in a line, that of /?5 be- 

 ing much farther distad 6 



6. Abdomen entirely light brownish yellow; triangular basal cell 



( 9 ) very much shorter than cell R. (Peru) . .arcuala sp. n. 

 Abdomen darkened toward the tip ; triangular basal cell (S 9 ) 



almost as long as cell R. (Colombia) tiitens Schin. (4) 



(i) Osten Sacken. Berl. Ent. Zeitschr.; vol. 31, p. 176 (1887). 



(2) Schiner, Novara Reise, Dipt, p. 43 (1868) (as Rhamphidia) . 



(3) Osten Sacken, Berl. Ent. Zeitschr.; vol. 31, p. 177 (1887). 



(4) Schiner, Novara Reise, Dipt., p. 47, pi. 2, fig. 3 (1868) (type of 

 the genus). 



