ICHNEUMON-FLIES, PART 2: EPHIALTINAE 211 



la. Perithous mediator pleuralis (Cresson), new status 

 Figure 322,] 



Perithous pleuralis Cresson, 1868, Canadian Ent., vol. 1, p. 46; 9 . Type: 9 , 



Grimsby, Ont. (lost). 

 Biology: Champlain, 1922, Psyche, vol. 29, p. 97. — Reinhard, 1929, Nature 



Mag., vol. 13, pp. 155, 156, 157. 



Punctures on abdomen of female moderately coarse and dense; 

 male flagellum without tyloids or with very narrow weak tyloids on 

 about the tenth to fourteenth segments. 



Male: Black. Face, frontal orbits, clypeus, mouth parts, scape and 

 pedicel beneath, upper margin of pronotum, tegula, subtegular ridge, 

 all or most of mesepimeron, apex of scutellum, postscutellum, crescent 

 on apical carina of propodeum, spot at middle of apex of first tergite, 

 and apex of second to seventh tergites, white, the white apex of the 

 second to seventh tergites usually interrupted sublaterally by a brown 

 spot; flagellum brown, light brown below; mesosternum and mesepi- 

 sternum except for an area of variable size below and behind subtegular 

 ridge, ferruginous ; mesoscutum mostly ferruginous or f uscoferruginous ; 

 scutellum ferruginous, its apex white; front and middle legs whitish, 

 the femora fulvous behind, the coxae, tibiae, and tarsi with some pale 

 fulvous tinges, and apex of each segment of middle tarsus fuscous; 

 hind coxa fulvous; hind trochanters whitish; hind femur fulvous, its 

 extreme base brown, extreme apex whitish, and subapical 0.17± 

 infuscate; hind tibia white with an anterodorsal fuscous stripe begin- 

 ning at its subbasal swelling and extending to apex, at apex expanding 

 into a broad band around tibia and at its base expanded into a narrow 

 subcomplete band around tibia; hind tarsus whitish, the apex of each 

 segment fuscous; wings hyaline. 



Female: Colored like the male except as follows: Face black, white 

 next to eye ; clypeus black, more or less white basally and along apical 

 margin; coxae fulvous, the front and middle coxae whitish dorsally; 

 first trochanters light fulvous and whitish; second trochanters mostly 

 whitish; front and middle femora fulvous, paler in front; hind tibia 

 and tarsus as in the male but the ground color stramineous and the 

 fuscous markings more extensive; middle tibia and tarsus with a 

 washed-out repetition, and front tibia and tarsus with a faint repeti- 

 tion of the colors of the hind tibia and tarsus. 



Specimens (96 c?, 1179): From Alaska (Anchorage, Chitina, and 

 Rampart) ; Connecticut (Canterbury, Lyme, and Voluntown) ; District 

 of Columbia (Anacostia); Iowa (Sioux City); Kansas (St. George); 

 Louisiana (Shreveport) ; Maine (Lincoln Co.); Maryland (Bowie, Glen 

 Echo, Hagerstown, Hummers Island, and Woodstock) ; Massachusetts 



