THE CANADIAN ENTOMOLOGIST. 51 



(in the place cited) quotes Haliday as being responsible for the group, 

 in fact as he was. Euderus Haliday has little in common with Trichapoms 

 Foerster. 



The characters of the new genu^, extracted from the key of the 

 Tetrastichini as given by Ashmead ([904, pp. 348-349), are as follows : 

 Tetrastichines with a sessile cylindrical abdomen as long as, or longer 

 than, the thorax, and convex above (dorsad), a slender marginal vein in the 

 hind wings, the mesonotum without a median groove, the pronotum net 

 conical, the antennce 9- or lo-jointed with one or two ring-joints, the 

 scutellum with four (or two ?) longitudinal grooved lines, the metanotum 

 usually punctate, and the head, thorax and abdomen punctate or shag- 

 reened ; the fore wings with short marginal fringes, the hind wings not 

 acutely pointed at apex and the segments of the abdomen subequal in 

 length. The genus is closely related to Tetrastichodes Ashmead on the 

 one hand and to Sytitoviosphyrum Foerster on the other. 



Ashmead always spelled the name Trichoporus instead of Tricha- 

 poms ; as stated, I have adopted the latter as being correct. 



The genus as it now stands contains six species, two of which 

 (colligiiayœ and coiumbianus), however^ are more or less doubtfully 

 placed. I have been imable to gain access to the types of any of the 

 species. 



Host Relations. 

 The habits of the parasites of this genus are not well known. In 

 fact, in no case is there a definite record of the host of any one species, 

 and but three of the species have been in any way connected with hosts. 

 Trichaponis colîimbianus (Ashmead) is stated by Smith (1900) to live in 

 cecidomyid galls ; colliguayce (Philippi) was reared in large numbers from 

 a gall on Colliguaya odorifera Molina in Chile, but under circumstances 

 which would necessitate confirmation of this gall forming habit; it is 

 possible that the gall was cecidomyid, and the species parasitic on the 

 latter ; œneoviridis was reared under conditions which make it impossible 

 to decide whether it is parasitic on a-n ichneumonid, a syrphid or a larva 

 of a lasiocampid moth. Nothing definite can therefore be stated in regard 

 to the host relations of the genus. 



Distribution of the Genus. 

 The species of the genus Trichaporus as now known are restricted to 

 the Western Hemisphere, and the majority of the species belong to South 

 America ; melleus Ashmead, viridicyaneus Ashmead, Persimilis Ashmead 



