The Canadian Entomologist. — 
NGI? TN. LONDON, ONT., MAY, 1872. No. 5. 
DESCRIPTIONS OF 
NORTH AMERICAN HYMENOPTERA, No. 3. 
BY E. T. CRESSON, PHILADELPHIA. 
(Continued from Page 64.) 
Family ICHNEUMONID&. 
.Genus PERILITUS, Nees. 
This Braconid genus belongs to Wesmaels group Polymorphes, and 
the species described below to Haliday’s subgenus ÆZefeorus, which is dis- 
tinguished from the other genera or subgenera with petiolated abdomen, 
by the anterior wing having ¢hrce contiguous cubital cells. 
I. PERILITUS NIVEITARSIS. JV. s6.— gf 9.—Ferruginous, shining ; 
cheeks, sides of thorax and apex of abdomen thinly clothed with a short, 
whitish, somewhat pruinose pubescence ; face and mouth pale ferrugin- 
ous; palpi whitish ; occiput and space enclosed by ocelli, blackish ; 
antennæ entirely dark fuscous; prothorax and sutures of mesothorax 
blackish ; metathorax rounded, reticulated and with a transverse arcuate 
carina before the middle ; tegulæ pale yellow; wings hyaline, iridescent, 
costal nerve and stigma pale yellow or ferruginous, nervures fuscous; 
second cubital cell subquadrate, broader at base ; interno-discoidal cel of 
same length as the externo-discoidal; recurrent nervure on a line and 
confluent with the intercubital nervure ; four anterior tibiæ except tips, 
their tarsi and base of posterior tibiz yellowish, posterior tarsi white, apex 
of posterior tibiæ fuscous, terminal joint of all the tarsi black ; abdomen 
smooth and polished, first segment rugulose, sides margined, the disc with 
a faint longitudinal carina, lateral tubercles tolerably well developed ; ovi- 
positor nearly as long as abdomen, ferruginous, sheaths black. : Length 
.30 inch. 
Hab.—Massachusetts Two 9®,three Î,specimens. This is our 
largest species, and is easily recognized by the white posterior tarsi, the 
color of the body being much darker than that of the next species. 
2. PERILITUS PALLITARSIS. NV. sp.—f.—Yellow ferruginous or 
honey-yellow, shining, thinly clothed with a short whitish pubescence ; 
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