No. 2320. TRIBE ACOENITINI—CVSHMAN AND BOHWER. 511 



Represented in the United States National Museum by five females 

 (one a homotype by Mr. Rohwer) and eight males, all from the North- 

 west, ranging through Vancouver, Washington, Oregon, and Idaho. 



The only biological data consists in a note on one of the females 

 labeled "Hopkins U.S. No. 1061," which was taken on a dead hemlock 

 log, August 26, 1902, at Junction, Washington, by A. D. Hopkins. 



COLEOCENTRUS QUEBECENSIS Provancher. 



Coleocentrus quebecensis Provakcher, Nat. Can., vol. 6, 1874, p. 79, female. 



Discussion based on original description. 



Provancher himself reduced this species to synonymy with pettitii 

 Cresson. But his description differs from that species by the char- 

 acters used in the above table to species. In his examination of 

 Provancher's types, Mr. Rohwer was unable to find a specimen 

 labeled quebecensis, but did find one labeled pettitii. Concerning 

 his findings he wrote the following note: 



Type not in Public Museum, Quebec, unless it is a specimen labeled as pettitii 

 Creason. C. pettitii of Provancher is pettitii of Cushman's manuscript table. 



Th.e humeral red spot, unless merely a not fully colored area, is 

 very unusual for the genus. 



COLEOCENTRUS PETTITU Cresson. 



Coleocentrus pettitii Cresson, Can. Ent., vol. 1, 1868, p. 35, female. Type. — 

 Acad. Nat. Sci. Phila., No. 1430. 



Discussion based on type, homotype, and one other female. 



The strongly contrastmg black body and coxae and pale red legs 

 makes this species very readily recognizable. 



Compared with niger Cushman, the homotype differs, in addition 

 to the characters used in the key, as follows: Head polished; face 

 finely punctured; temples convex, rather broad; diameter of lateral 

 ocellus little more than half as long as oceUocular line; petiolar area 

 of propodeum not especially short, longitudinal carinae strong, 

 spiracle long oval; abdomen more polished; first tergite barely half 

 as wide as long, and less than a half longer than second; hypopy- 

 gidium much less than half as long as abdomen; ovipositor three- 

 fourths as long as body. 



Head, thorax, abdomen, and all coxae black; clypeus, tegulae, 

 venter, and narrow apical margins of tergites piceous; legs pale 

 red, hind tibiae fuscous, especially above and at apex, their tarsi 

 yeUow. 



In size very similar to niger. Labeled: "North Mt., Pa., 6. 9." 



The other specimen is somewhat smaller, but otherwise very similar. 

 It was taken at Kentville, Nova Scotia, June 29, 1916. 



There is a male in the collection of the Academy of Natural 

 Sciences of Philadelphia. It is labeled by Davis with a manuscript 



