9 
bo 
THE CANADIAN ENTOMOLOGIST. 
base rufo-piceous ; thorax laterally and beneath honey-yellow ; mesothorax 
and scutellum fusco-ferruginous, the former darker laterally ; metathorax 
piceous-black, the flanks honey-yellow ; tegulæ yellowish-white ; wings 
hyaline, iridescent, nervures luteo-fuscous, stigma luteous ; legs luteous, 
posterior tibiæ paler, the extreme base and apex fuscous, their tarsi dusky 
towards the apex; abdomen long, slender, polished black, apical margin 
of third segment obscurely testaceous ; venter luteous. Length 2% lines. 
ffab.—Illinois. Easily distinguished from the other species by the 
black abdomen. 
2. Mesochorus agilis, Cresson. Proc. Ent. Society Phila., April, 7865, 
p. 200. 
2. Black, polished ; most of clypeus, extreme lower portion of cheeks, 
mandibles except tips, and the palpi, yellowish ; antennæ longer than the 
body, slender, brown-black ; tegulæ and a spot before pale yellowish ; 
wings ample, hyaline, iridescent, nervures pale fuscous, yellowish at base 
of wing, as well as costa and stigma ; legs obscure luteous, posterior coxæ 
fuscous, tips of their tibiz and their tarsi dusky ; abdomen piceous black, 
polished, apical margin of second segment, and the whole of the third, 
obscure luteous ; venter stained with yellowish. Length 3% lines. 
ffab.—Colorado. This is the largest species known to me. 
3. Mesochorus luteipes. N. sp.—¥ Black, shining ; face, mouth, and : 
lower part of cheeks luteous ; middle of face and tips of mandibles dusky ; 
antennæ nearly as long as the body, slender, fuscous, scape pale honey 
yellow ; prothorax beneath and tegulz luteous ; wings hyaline, iridescent, 
nervures and stigma pale fuscous; legs luteous, posterior coxe and 
femora slightly tinged with fuscous, the extreme base and apex of their 
tibiæ dusky, also more or less of their tarsi; abdomen above piceous- 
black, polished, most of the third segment dull luteous, apical segments 
have a brownish tinge ; venter rufo-testaceous. Length 2 lines. 
Hab.—New Jersey. Much smaller than Agz%s, which it resembles in 
haying the thorax almost entirely black; it is, however, abundantly 
distinct. 
4. Mesochorus basalis. WN. sp.—®. Honey-yellow ; spot covering 
ocelli and confluent with a large transverse mark on occiput, tips of 
mandibles, mesothorax, scutellar region, metathorax entirely and spot 
beneath wings, black; antennæ ferruginous; face luteous, with small 
dusky stains ; two faint longitudinal lines on mesothorax and most of 
scutellum, honey-yellow and concolorous with pleura; tegulæ pale luteous ; 
