NO. 2284. jffEW NORTH AMERICAN ICHNEUMON-FLIES— CUSHM AN. 533 



HELCOSTIZUS CANADENSIS (Provancher). 



Mesochorus canadensis Provancheb, Nat. Can., vol. 6, 1874, p. 299. 

 Echthrus canadc7isis Provancher, Favin. Ent. Can. Hym., 1883, p. 486. 



I have not seen this species but Mr. Rohwer, who has examined the 

 type, says that it is a Helcostizus and most likely the same as fiskei 

 Viereck. The characters used in the key are the only ones in the 

 description of canadensis with which the type of flsl'ei does not agree. 

 Provancher says of canadensis "metathorax lisse a la base, ponctue 

 au sommet." In fiskei the polished portion is at the apex and the 

 sculptured portion at the base. This condition is certainly the more 

 natural one and it seems likely that Provancher inadvertently re- 

 versed his statement. The difference between no dorsal carinae on 

 the first tergite and the condition found in -fiskei may very easily be 

 an individual variation as is certainly the size of the antennal 

 annuhis. It is very likely that fiskei will have to fall as a synonym 

 of canadensis. 



HELCOSTIZUS YUKONENSIS (Ashmead). 



Pimpla yukonensis Ashmead, Proc. U. S. Nat. Mus., vol. 12, 1890, p. 445. 



Compared with Helcostizus hicarinatus Cushman, described above, 

 the type differs as follows: Cephalo-caudad length of temple much 

 more than half that of eye ; distance of occipital carina from posterior 

 ocellus much longer than postocellar line; malar space longer than 

 basal width of mandible ; clypeus with a median tooth ; general sculp- 

 ture of body finely granular with scattered, weak punctures, more 

 dense on face and in middle of mesoscutum; propodeum with only 

 one transverse carina, finely reticulato-granulate above, irregularly 

 longitudinally striate posteriorly, spiracle but little nearer to base 

 than to carina ; aerolet defined ; first tergite with dorsal carinae even 

 less distinct beyond summit, nearly as wide at apex as long. 



Black with piceous cast, especially on face, and sides of thorax and 

 abdomen; antennal annulus confined to flagellar joints 6 and 7; 

 palpi piceous; middle and hind tibiae and tarsi uniform fucous with- 

 out basal annuli ; front coxae uniform piceous. 



More closely allied to the genotype Helcostizus hrachycentrus 

 (Gravenhorst), which disagrees with the above description prin- 

 cipally in having the propodeum without striation behind, the spiracle 

 almost exactly half way between the l^ase and the carina, and in lack- 

 ing the black color at the apices of the hind femora. 



The single paratype is essentially like the type. 



HELCOSTIZUS RUFISCUTUM. new Bpeciea. 



Distinct from all of the other North American species in the 

 largely red mesothorax, white front and middle coxae and trochanters, 

 and the narrow, weakly arched first tergite. 



