NIO'RTH AMERICAN TETRASTICHUS — BURKS 603 



UNPLACED SPECIES 



The following species cannot be placed satisfactorily from the pub- 

 lished descriptions, and the types are lost, too broken to be of much 

 assistance in identifying the species, or not at present available to me 

 for study. Specific differences are so obscure and critical in this genus 

 that the placing of species is impossible unless the types for all the 

 species are available for study together. 



TETRASTICHUS ACUTUS Ashmead 



Tetrastichns acutus Ashmead, Trans. Amer. Ent. Soc, vol. 13, p. 34, 1886.— 

 Cresson, Synopsis of families and genera of Hymenoptera . . ., p. 245, 1887. 



This species was described from a male specimen from Florida; 

 the type is lost. 



TETRASTICHUS ALASKENSIS Ashmead 



Tetrastichns alaskensis Ashmead, Proc. Acad. Sci. Washington, vol. 4, p. 146, 1902. 

 Type.— U.S.N.M. No. 5529; this type, a male, from Popof Island, 

 Alaska, July 19, is too badly broken to be placed. 



TETRASTICHUS ANTHRACINUS Ashmead 



Tetrastichus anthracinus Ashmead, Proc. Acad. Sci. Washington, vol. 4, p. 146, 

 1802— (?) Burke, Journ. Eeon. Ent., vol. 13, p. 384, 1920. 



Type.— U.S.N.M. No. 5528; described from a single female from 

 Seldovia, Alaska, July 7. This specimen is too broken to be recog- 

 nizable. 



TETRASTICHUS CANADENSIS Ashmead 



Tetrastichns canadensis Ashmead, in Howard, Ent. News, vol. 17, p. 292, 1906; 

 Redia, vol. 3, p. 390, 1806. — Barroetavexa and CJirola, Bol. Argentina Min. 

 de Agr., vol. 20, p. 314, 1916. 



This evidently is a manuscript name ; the name has been quoted at 

 least three times, but never with a description. The host originally 

 cited by Howard was Di-aspis pentagona Targioni-Tozzetti. There 

 are, in the National Museum, five specimens bearing the name 

 Tetrastichus canadensis Ashmead, in Ashmead's handwriting, but 

 these specimens were reared from a gall on the leaves of Rosa. The 

 exact status of this name cannot, therefore, be determined. 



TETRASTICHUS CENTRICOLAE (Ashmead), new combination 



Baryscapus ccntrwnlae Ashmead, Trans. Amer. Ent. Soc, vol. 14, p. 202, 1887. 

 Type locality. — Asheville, N. C. 



Type.— U.S.N.M. No. 51756. (Specimen much broken.) 

 Host. — Dryophanta ceittricola (Osten Sacken). 



