186 
9. TRICHOPEPLA Stal 
Kery To SPECIES 
Sides of pronotum arcuate; head scarcely tapering; antennae black, first anten- 
nal rufous; basal half of scutellum finely and densely punctate..... atricornis. 
Sides of pronotum nearly straight; head distinctly tapering, with three pale 
impunctate stripes; antennae black, basal two or three segments pale; basal 
half of scutellum coarsely and unevenly punctate...............-. semivittata. 
TRICHOPEPLA ATRICORNIS Stal 
Trichopepla atricornis Stal, Enum. Hemip., Pt. 2, p. 34. 1872. 
Recorded from Illinois and Wisconsin, west to California and Alaska. 
Not represented in our collections. 
TRICHOPEPLA SEMIVITTATA Say 
Pentatoma semivittata Say, Descrip. n.sp. Heterop. Hemip. N. A., 1831; 
Compl. Writ. Ent. N. A., Vol. 1, p. 319. 
Ranges from Canada and Maryland west to Colorado. Our material 
shows a remarkable variation in size and color. Specimens from south- 
ern Illinois are smaller (5-7 mm.) and paler, the square black spots of 
the connexivum often reduced to rufous shades on a yellowish ground- 
color, while those from central Illinois measure 7—8,5 mm. and are usually 
darker, with distinct black connexival spots. ‘One specimen, evidently 
this species, has the antenna black except the basal joint. Dubois, Car- 
bondale, Alto Pass, Cobden, Parker, Dongola, Brownfield (S. Ill); Ur- 
bana and Seymour (C. Ill.)—June 7-22, July 3, 16, 17, 18, August 24, 30, 
and October 7. On the latter date they were abundant near Urbana in 
all stages, and Van Duzee so found them near Buffalo, N. Y., November 3. 
The food plant is the common wild carrot. 
10. NeortrcLossa Kirby 
[This genus and Aelia are exceptions to the general rule in this 
subfamily in having the prothorax produced anteriorly on venter in the 
‘form of a thin plate on each side, each plate being reflexed near its inner 
margin and continued caudally in the form of an erect slender ridge as in 
Scutellerinae. The other structures in the genera are, however, similar 
to those of the Pentatominae, and as the nymphs agree better with those 
of the latter than with Scutellerinae, in having the anterior tergal scent- 
glands in line with the posterior pairs, it appears to me inadvisable with 
the available data to suggest any change in the subfamily arrangement. ] 
Ktty To SPECIES 
NYMPHS 
Dorsal surface of head evenly rounded................e0ec eect eeeeee sulcifrons. 
Dorsal surface of head with a large circular depression on disc....... cavifrons. 
IMAGINES 
Head dorsally evenly convex transversely and longitudinally, at sides narrowly 
elevated above lateral carina; general color pale, fusco-punctate; head with 
Pale median: Wrme sees 3/0 oie srecetssoraperaln eievans miaroteas terol ncecmeedeusleial cise tate resale carole undata. 
