THE CANADIAN ENTOMOLOGIST. 23 
wings hyaline, iridescent, stigma fuscous, nervures paler ; legs pale honey- 
yellow, coxæ and posterior tibiæ luteous, tips of the latter dusky, as well 
‘as-most of the tarsi; abdomen honey-yellow, the first, and the second 
segments except apical margin, black. Length 234 lines. 
Hab.—Massachusetts. 
5. Mesochorus americanus. AN. s5p.—®. Pale honey-yellow ; spot en- 
closing ocelli, sometimes more or less of occiput, tips of mandibles, 
mesothorax and more or less of metathorax above, black ; antennæ as 
long as body, slender, varies from rufo-testaceous to fuscous, with the 
scape luteous; scutellum and region honey-yellow ; tegulæ luteous ; wings 
hyaline, iridescent, nervures and stigma pale fuscous ; legs pale luteous, 
almost white, the femora tinged with yellowish, extreme apex of posterior 
tibiæ blackish; abdomen fusiform, very slender at base, first segment | 
above entirely black, second luteous, with the basal half black, the margin 
indented anteriorly, so that in some specimens the black is divided into 
two subquadrate spots, remaining segments luteous, with fuscous apical 
margins ; venter luteous. Length 2% lines. 
Hab.—Pennsylvania, Delaware, Illinois. 
6. Mesochorus totonacus. NV. sp—f§. Pale honey-yellow, metathorax 
and abdomen darker, smooth and polished ; tips of mandibles, antennæ 
except base, first segment of abdomen and basal half of second, black ; 
wings hyaline, iridescent, nervures and stigma blackish ; tips of posterior 
femora, of their tibiæ and of all the tarsi, dusky. Length 214 lines. 
Hab.—Orizaba, Mexico. 
7. Mesochorus vitreus, Walsh. ns. Inj. to Veg. in Llls., p. 30. 
“-f. General colour light rufous ; eyes and ocelli black ; antennæ 
fuscous, except towards base ; upper surface of thorax sometimes fuscous ; 
intermediate and posterior tibiæ with spurs equal to one-fourth of their 
length, posterior knees slightly dusky, tips of posterior tibiae distinctly 
dusky ; wings hyaline, nervures and stigma dusky ; abdomen, a trans- 
lucent yellowish-white in its central one-third, the remaining two-thirds 
piceous-black, with a distinct narrow yellowish annulus at the base of the 
third joint. The © differs from the ¢ in the head from the mouth 
upwards being piceous ; the thorax and pectus are also piceous-black ; 
abdomen asin the #. Length .o8—.13 inch.” 
Hab.— Illinois. Bred from the Army-worm (Leucania unipuncta, 
Haw). This species is unknown to me. The f seems to be closely 
allied to that of scctulus, n. sp., but the © is entirely different. 
