AMERICAN ORTHOI'TKHA. 239 



5. T. obMCuruM sji. n. (I'laU' Vll, li^rs. !t. !*a iuid 10, 10a). — Cei)hal<i-ili)r.sal 

 outline as sli(»\vn plate ix. figs. 23 and 25. Diflers from tlie foregoinfi, T. inflatus. 

 which it most resenil>les. in having stature more slender, hut broader than T. 

 angustus. The vertex is about as wide, but the pronotum is flattened on the 

 dorsum, and the lower margins of the lobes strongly distended laterally ; surface 

 of dorsuiu finely rugose. Wings overreach apical process. 



5a. Plate VII, fig. 10, 10a. — Not quite as broad through the shoulders, about the 

 same length, having the pronotum nearly horizontal and becoming concave pos- 

 teriorly ; median carina hardly raised between the shoulders, very thin, almost 

 disiippearing in its backward course to the apex; pronotum not strongly con- 

 stricted, corrugations but slightly shown ; dorsum not flattened quite as much ; a 

 short wing form also occurs. As stated above it is not named, jjending further 

 study. Length 9 1^ m'"- 

 Riverside, 111. 



(). 'I'. gil»l>osu!>i sp. n. (Plate VI, fig. 5, 'mi). — Cephalu-dorsal outline ai-- in 

 fig. 30, plate ix. Vertex in jtrofile produced, angulate, frontal costa excavate but 

 little in front of the eyes, the carinated front border of face below bent forward, 

 rather flattened at the middle, face slightly oblique, eyes prominent ; from above 

 the small mid-carina of vertex projects plainly from the middle of the excised 

 front border; pronotum truncated in front, flattened on dorsum, the latter is 

 broad, with a pronounced anterior dorsal hump between the shoulders, raised 

 above level of eye; behind the hump the dorsum is sharply depressed, behind 

 this again a much smaller protuberance, rarely a broken surface follows in profile, 

 luetlian carina slightly more distinct than the lateral ones; dorsum not uncom- 

 monly with transverse roughened lines: apical process not greatly lengthened, 

 sometimes reaching beyond the wings, but oftener not passing the latter; lateral 

 angles of dorsum strongly projecting over the tegmina ; tegmina witii surface 

 l)unctate and granulate. Length of body 9> H-"' "i'"- ^ pronotum 9- 10.5 mm. 



By contrast with ^n(niihitut< the vertex is strons^ly pointed, and 

 the frontal costa is sharply excavate. The general color of speci- 

 mens is often like the ground upon which they find subsistence. 

 S[)ecial markings occurring in this species is shown in plate viii, figs. 

 14-20. In recent specimens a tinge of opaque green is often found 

 with dark mottlings on the sides of the abdomen. It frequents the 

 more shaded portion of the banks of the Des Plains River, and is 

 found from early iSpring to late Fall. Flight is not often attempted, 

 rather preferring to hug the ground closely. 



Ablircviated variety. — A slightly smaller form exists with charac- 

 ters nearly the same, excepting the })ronotum and wings; met with 

 in the same situations. The pronotum is not extended into such a 

 slender point Iiehind, the sides are more nearly .straight, very fre- 

 (piently individuals are found with the tip of the apical process 

 slightly decurved or distoi'ted, :nid just reaching the end of the 

 wings and posterior knee. The shortness of the body in this variety 



TRANS. AM. ENT. SOC. XXIII. JULY, 1H96. 



