Vol. XXIV] ENTOMOLOGICAL NEWS 4OQ 



This remarkable genus of flies is apparently confined to the 

 tropics of South America. 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 

 Osten Sacken in the second part of his "Studies on Tipulidae" 

 (Eerl. 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 Peripheroptera. 



1. Cell 1st M.2 open; [thorax black shining; inner end of cell R$ an- 



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



incommoda O. S. (i ) 

 Cell ist M2 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 7?3, R$ and i st M2 about in a straight line ; 



femora yellow basally darkening into brown at the tip. 



(South America) abcrrans Schin. (2) 



Inner ends of cells RT, and ist M.2 much farther proximad than the 

 inner end of cell R$ ; legs black. (Peru). 



teucholab aides sp. n. 



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



brown seam along the cord; [cell ist Al2 elongated; inner 

 ends of cells R$, R$ and ist M2 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 R$, R$ and ist J\l2 nearly in a line. (Brazil). 



schineri O. S. (3) 



Inner ends of cells R$, R$ and ist M.2 not in a line, that of R$ be- 

 ing much farther distad 6 



6. Abdomen entirely light brownish yellow; triangular basal cell 



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



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



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



(1) Osten Sacken, Berl. .Ent. Zeitschr.; vol. 31, p. 176 (iSS;). 



(2) Schiner, Xovara Reise, Dipt, p. 43 (1868) (as Rlnunphidia) . 



(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). 



