No. 2317. FIVE TRIBES OF ICHNEVMONINAE—ROHWER. 441 



There is no tangible difference between the types of nleyi and the 

 types of lepturae, but the female specimens grouped under the name 

 rileyi may be divided into three groups as follows: 



1. Hind coxae rufous Form A. 



Hind coxae black 2. 



2. Anterior part of prescutum with widely separated punctures Form B. 



Prescutum stria to-punctate or with rather close punctures anteriorly Form C. 



These three forms have different hosts and future investigation 

 may prove that they are distinct, but inasmuch as they all agree in 

 habitus and the above characters are all that could be found it does 

 not seem advisable to name them. The types of both rileyi and 

 lepturae come under form B. 



Missouri (Ashmead); Cherrydale (Van Horn), Veitch (Craighead, 

 Snyder), Virginia; Washington, District of Columbia (Howard, 

 Champlain) ; Linglestown, Pennsylvania (Champlain) ; Trj^on, North 

 CaroUna (Fiske). 



Host. — Chittenden records this species as a parasite of Xylotrechus 

 colonus. The unpublished records of the Branch of Forest Insects, 

 Bureau of Entomology, give the hosts as follows: Form A from 

 Xylotrechus colonus; form B from. Leptura nitens and CaUidiumaereum; 

 &nd form irom. Romaleum atomarium. 



Group INStTLABIS. 



Group cliaracters. — Facal quadrangle wider than long; face punc- 

 tured or punctato-striate; frons sparsely punctured; vertex shining 

 sparsely punctured; posterior orbits obliquely striate below; post- 

 ocellar line subequal with the ocellocular; antennae of male with 

 short hair, angles of pronotum not prominent ; scutum sparsely punc- 

 tured or punctato-striate ; propodeum punctured, carinae or a carina 

 strong but not prominent, angles not toothed; basal area triangular, 

 separated from the areola by the short coalescing of the median 

 carinae or the two areas confluent; first tergite in female about two 

 and one-half times as long as basal width, without median carinae 

 or a carina from spiracle to apex; second tergite in female slightly 

 longer than apical width; tergites coriaceous, granular or finely 

 transversely aciculate; base of third tergite in male without de- 

 pressed areas laterally; nervulus interstitial or slightly postf ureal; 

 nervellus perpendicular or reclivous, broken at about middle; ovi- 

 positor longer than abdomen. Black; head and sometimes thorax 

 with some yellow markings; legs reddish, the posterior ones paler; 

 wings hyaline; antennae black in both sexes. 



XORroES INSULARIS (Cresson). 



Poemenia insularis Cresson, Proc. Acad. Nat. Sci. Phila., 1878, p. 380. 

 Xylonomus insularis (Cresson) Cresson, Trans. Amer. Ent. Soc, 1887, p. 220. — 

 Harrington, Can. Ent., vol. 23, 1891, p. 134. 



" Ti^'pe.— Cat. No. 1521, Acad. Nat. Sci. Philadelphia. Notes from 

 type, homotype and specimens listed below. 



