REVISION OF THE GENUS EXETASTES CUSHMAN 245 



(ExETASTES CLAVATUS Provancher) =EuRYPROCTUs CLAVATL'S (Provancher), new combination 



Neither Davis nor Rohwer and Gahan could find the type of this 

 species in the Provancher collection, but I have been able to recog- 

 nize it in a species closely related to Euryprodus petiolatus Davis. A 

 specimen in the United States National Museum agrees almost per- 

 fectly with the original description, and I have identified it as clavatus. 



(EXETASTES CONSIMILIS Cresson) =LlssONOTA CONSIMIUS (Cresson), new combination 



This species is based on a male closely related to Lissonota americana 

 (Cresson). 



(ExETASTES NIGER Provancher, not Cresson) =Arenetra rufipes Cresson 



Provancher misidentified as Exetastes niger Cresson a female 

 specimen, which he later identified as Arenetra rufipes Cresson. 

 Dalla Torre, mistaking Provancher's intention, synonymized Exe- 

 tastes niger Cresson female (not male) with Arenetra rufipes Cresson. 

 In this he was in error, for niger is an Exetastes, and the male and 

 female described by Cresson are conspecific. 



(Campoplex NIGER Provancher) =Casinaria genuina (Norton) 



Although this species, as represented by its type, has never really 

 been placed in Exetastes, its name is involved with the genus because 

 of the mislabeling of a specimen of Exetastes suaveolens Walsh, under 

 which species the matter will be fully discussed. 



(Exetastes rufus Provancher) = Dyspetes rufus (Provancher) 



1 have already published this generic transfer (Proc. U. S. Nat. 

 Mus., vol. 72, art. 13, p. 21, 1927. 



HOST RELATIONS 



So far as species of Exetastes have been reared they are internal 

 parasites of lepidopterous larvae. The full-grown larva leaves its 

 host before spinning its cocoon. The only recorded exception to this 

 host relation is that of Exetastes cimbicis Vollenhoven ^ from Holland, 

 which is said to be parasitic on the sawfly Cimbex aenea (Fabricius). 



Among the Lepidoptera the favored hosts appear to be Noctuidae, 

 especially those of the type loiown as "cutworms." Records of the 

 rearing of species of Exetastes from such hosts as Tortricidae and 

 Pj-ralidae and perhaps those in other groups, several of wliich have 

 been published, mostly of European species, seem most likely to be 

 errors of identification either of the host or of the parasite, for in nearly 

 every case the species of Exetastes involved is known as a parasite of 

 some noctuid. Probably for the reason that the hosts have been 

 reared only sparingly there are comparatively few rearing records in 



1 1 have been unable to secure the original description of this species, but I suspect that it is a species 

 of Xenoschesis or of some allied tryphonine genus. 



