No. 2326. THREE TRIBES OF ICHNEUMONINAE—CUSHMAN. 13 



punctate; pronotum almost without sculpture, anterior dorsal angles 

 very sharp; mesoscutum and mesopleura polished, sparsely punctate, 

 scutellum more densely and strongly so; metapleura more strongly, 

 but not more densely, punctate; propodeum with very deep punc- 

 tures which dorsally are arranged more or less in transverse rows and 

 posteriorly in longitudinal rows, this difference together with a slight 

 concavity of the sloping posterior face indicating the line of division 

 of the propodeum into dorsal and posterior faces; median longi- 

 tudinal carinae very briefly indicated at base; legs slender, hind 

 basitarsus very nearly as long as other joints combined; abdomen 

 sparsely though strongly punctate, the triangular areas practically 

 without punctures; first tergite slightly longer than wide at apex, 

 sides nearly straight. 



Yellow with the following black or blackish markings: ocellar 

 area, occiput dorsally, vertex posteriorly, elongate spot on prescutum, 

 one on each of the lateral lobes coalescing posteriorly with a trian- 

 gular spot in front of the scutellum, a spot on each side of mesos- 

 ternum running up along prepectus then backward under front v>dng 

 and narrowly connected with a large spot on the posterior margin 

 of mesopleurum, a narrow transverse band at base of propodeum 

 and a rounded apical spot, hind coxae basally, a band across middle of 

 first tergite, a basal band on each of the next three tergites which is 

 narrow medially and becomes dilated laterally to embrace the entire 

 lateral elevated areas, and a broad band on fifth tergite; antennae 

 pale beneath and at apex, dark brown above; wings hyaline, veins 

 and stigma dark brown, apices of front wings fuscous; front and 

 middle legs yellow; hind coxa at apex, the trochanter, tibia except at 

 apex, and tarsi yellow, femur testaceous, tibia at apex reddish 

 fuscous; ovipositor sheath black, yellow at apex. 



The paratype differs practically only in being somewhat smaller, 

 in having the black markings of the thorax somewhat larger, the 

 mesosternum and mesopleura almost entirely black, a large spot on 

 each side of pronotum, the alar region varied with piceous and the 

 black of the fourth tergite entirely surrounding the triangular area. 



Type locality. — ^Plummer's Island, Maryland. 



Type. ^C&t. No. 22144, U.S.N.M. 



Described from two females both from the type locality, the type 

 collected by S. A. Rohwer, June 20, 1911, and the paratype by H. L. 

 Viereck, September 8, 1912. 



Tribe POLYSPHINCTINI Cushman and Rohwer. 



The genera comprising this tribe have heretofore been placed in 

 the (Pimplini) Ichneumonini. 



The present revision is based on the collection of the United States 

 National Museum, but practically all of the types in various collec- 



