JOURNAL 



OF THE 



Jlf\a I9oFh €!nl^oinoIogiraI %mM^, 



Vol. XX. DECEMBER, 1912. No. 4. 



A REVISION OF THE GENUS BRACHYPREMNA 

 OSTEN SACKEN (TIPULID^, DIPTERA).i 



By Chas. p. Alexander, 

 Ithaca, N. Y. 



The genus Brachypremna was erected by Osten Sacken in 1886.* 

 for TipuJa dispellcns Walker; at the same time Tipula breviventris 

 Wiedemann was definitely referred to this geijus. The following 

 year,^ in part 2 of his " Studies on Tipulidae," the same author 

 described two new species, pictipes and unicolor, and gave a key (/. c, 

 p. 239) for the separation of the four known species. In 1900, Wil- 

 liston* described the fifth species, similis. I have had for study some 

 fifty specimens of Brachyprenin(2 received from the various Eastern 

 Museums, and in this material I found all of the known forms except- 

 ing pictipes. There was also included a new species, hereinafter 

 described, and a single specimen of the hitherto unrecognized Tipula 

 albimana of Wiedemann. This name is preoccupied by T. albimana 

 Fabricius (Mantissa Ins., vol. 2, p. 232, 1787) and I propose the name 

 Candida for the South American species. The seven species at 

 present known are separated by the included key. Brachypremna 

 eoccnica Meunier was recently" described from the baltic amber. 



^ Contribution from the Entomological Laboratory, Cornell University. 

 ^ Berl. Ent. Zeitschr., Vol. 30, p. 161. 

 ^ Berl. Ent. Zeitschr., Vol. 31, pt. 2; pp. 239, 240. 

 * Biologia Centrali-Americana, Dipt., Vol. i. Supplement, p. 229. 

 ^ Monograph of the Tipulidae and Dixidae in the Baltic Amber, Ann. Sci. 

 Nat. Zool., Vol. 4, p. 394; pi. 16, fig. 6. (Paris, 1906.) 



225 



