Vol. xxiv] ENTOMOLOGICAL NEWS 400, 



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 Tipulid?e" 

 (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 Peripheroptera. 



1. Cell 1st M2 open; [thorax black shining; inner end of cell R3 an- 



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



incommoda O. S. ( 1) 

 Cell 1st 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 R3, R$ and 1st M2 about in a straight line; 



femora yellow basally darkening into brown at the tip. 



( South America) aberrans Schin. (2) 



Inner ends of cells R$ and 1st M2 much farther proximad than the 

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



tcucholaboides sp. n. 



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



brown seam along the cord; [cell 1st M.2, elongated; inner 

 ends of cells R3, R$ and 1st M2 in a line.] (Peru). 



eudorae sp. n. 



Wings hyaline or suffused with yellowish ; no distinct brown caudal 



margin to the wing 5 



5. Inner ends of cells R3, R5 and 1st -I/2 nearly in a line. (Brazil). 



schineri O. S. (3) 

 Inner ends of cells R3, R$ and 1st M2 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) ... .nit ens Schin. (4) 



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



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



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



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

 the genus). 



