No. 2320. TRIBE ACOENITINI—CUSHMAN AND BOHWBR. 507 



11. Propodeal spiracle nearly circular; first tergite much more than half as wide 

 at apex as long, and not deeply impressed on each side near apex; diameter of 

 lateral ocellus fully two- thirds as long as ocellocular line; vertex and frona 



black. (Female only) rufm Provancher. 



Propodeal spiracle elongate oval; first tergite barely half as wide at apex as long and 

 deeply impressed on each side near apex; diameter of lateral ocellus little more 

 than half as long as ocellocular line; vertex and frons not black, .similis Cushman. 

 COLEOCENTRUS MELLIPES Provancher. 



Coleocentrus mellipes Provancher, Addit. Faun. Ent. Can., Hym., 1889, p. 113, 

 male. 



Discussion based on original descriptions. 



During his visit to Quebec for the examination of the Provancher 

 types, Mr. Rohwer was unable to find the type of this species, nor is 

 it listed in Provancher's manuscript catalogue. I am of the opinion 

 that it is not a Coleocentrus, the banded antennae, immaculate head, 

 and almost entire lack of propodeal carinae distinguishing it from 

 any other species of the genus. I can not, however, definitely 

 place it from the description and retain it in the present genus pro- 

 visionally. The banded antennae suggest such genera as EcMhrus, 

 Exetastes, Arotes, and Xorldes, but other characters mentioned in the 

 description exclude it from any of those genera. 



COLEOCENTRUS FLAVIPES (Provancher). 



Acoenites flavipes Provancher, Nat. Can., vol. 6, 1874, p. 80, female. Type.— 

 Dernifere Prov. Coll., Public Mus., Quebec. Yellow label 1249. 



Acoenites canadensis Provancher, Nat. Can., vol. 12, 1880, p. 10, male. Type. — 

 Dernifere Prov. Coll., Public Mus., Quebec. Yellow label 375. 



Discussion based on original description and notes by Mr. Rohwer 

 on types. 



The lack of the areolet led to the description of this species in 

 Acoenites and the failure to understand the sexual antigeny to the 

 redescription in the male. Mr. Rohwer, who examined the types, 

 considers canadensis as most certainly the male of Jlavipes. 



Mr. Rohwer's notes contain the following: 



Runs to Coleocentrus and agrees in all characters except the absence of the areolet; 

 also agrees in habitus. It will not fit any other genus in the table. Clypeus truncate 

 with a very small median tooth. In size it is very like C. similis Cushman (Type). 

 Other than the color and absence of areoiet only the following differences are noted; 

 clypeus more truncate; longitudinal carinae on propodeum more widely separated; 

 first tergite with the longitudinal depression a trifle deeper, and the ovipositor a 

 trifle longer. 



The rugosity of the face, credited to this species by Provancher, is, 

 if present, certainly very curious for this genus. Mr. Rohwer made 

 no note on this point. 



COLEOCENTRUS MINCE Cushman, new species. 



Evidently closely allied to flavipes (Provancher) from which the 

 smooth face, piceous palpi and tegulae, and shorter ovipositor 

 readily distinguish it. 



