292 ENTOMOLOGICAL NEWS. [ July, 16 
The present insect is very closely related to giganteus, dif- 
fering chiefly in the distinctly and strikingly more slender 
form. The less broad pronotum is much more regularly oval 
and the marginal fields of the tegmina are distinctly narrower 
in the present species. 
Both the present species and giganteus, as far as we are 
able to determine from females, agree in the following char- 
acters: 
Head with interocular width in males from slightly less than to a 
full one-fourth the interocellar width, in females from one-fourth to 
one-third: the interocellar width. Head shining blackish, the ocelli and 
soft portion of clypeus buff. Ocelli with flattened surfaces slanting 
laterad, the inner margins slightly raised above the flattened plane of 
the space between the ocelli. Tegmina very ample, rounding broadly 
distad to distinct but not. sharply rounded apex which in position is 
situated slightly nearer the costal margin. Dorsal surface of abdomen 
in both sexes with sixth segment strongly acute-angulate produced 
latero-caudad; seventh much narrower across abdomen and but slightly 
projecting beyond caudal margin of sixth, with small rounded latero- 
caudal projections; eighth still narrower across abdomen with caudal 
margin straight; supra-anal plate strongly quadrate produced, bilobate. 
Cerci moderately slender, slightly incurved, tapering distad to acute 
apex, with about seventeen short joints, (in females of giganteus 
twenty to twenty-two); polished and slightly convex above, very 
hairy and strongly convex below with narrow deep lateral marginal 
channels. Concealed male genitalia:—Mesad, from above a soft sur- 
rounding mantle, a moderately stout short tapering blunt chitinous 
projection extends caudad; the surrounding mantle having the free 
dorsal and distal margins fringed with small blunt chitinous projec- 
tions, these longer and more like short blunt teeth of a comb on the 
sinistral margin. Dextrad of this organ, from a broad chitinous base, 
a stout subchitinous shaft is directed caudad curving regularly out- 
ward, the convex surface is subchitinous, the inner surface soft, the 
apex more chitinous and flattened, broadened and blunt. Male sub- 
genital plate convex, asymmetrical, distal margin broadly convex from 
sinistral base to mesal portion of distal half, there rounding sharply 
into deep concave emargination at dextral base, within which the mar- 
gin is much softer and subchitinous. Minute slender cylindrical styles 
present on this margin at the inner bases of the cerci, the sinistral five 
times as long as broad and situated in a small indentation of the exter- 
nal surface near the margin, the dextral eight times as long as broad and 
situated in a more decided indentation of the margin itself. Ventro- 
cephalic margins of cephalic femora supplied proximad with three or 
