232 REPORT OF STATE GEOLOGIST. 



Color as in T. parvipennis ; vertex less projecting in front of eyes 

 Llian in that species. Frontal costa, viewed from the side, less prom- 

 inent. Eyes larger. Antenna? filiform, the joints of the middle 

 third, three to four times as long as broad. Pronotum with its front 

 dorsal margin more or less rounded, but little produced forward upon 

 the head; its dorsal surface rugose as in parvipennis; its posterior 

 portion surpassing the tip of hind femora in the long form; reaching 

 the end of abdomen in the short form, 2\ polymorpha 

 Buvrn. (?). Development of inner wings, as in other 

 species, depending upon the length of pronotum. 



Measurements: Length of bod}^, male, 12 mm., 

 female, 14.5 mm.; of pronotum, male, 9.5 mm., fe- 

 male, 12 mm.; hind femora, male, 5.5 mm., female, 

 7 mm. 



This is a species of southern range which in Indi- 

 ana has been taken so far only in Vigo, Putnam, 

 Fig. 42. Tettioi- Mouroc, Crawford, Floyd, Knox and Posey coun- 

 '^'AfteTLu''^r^' ^^GS— ^11 i^ ^^6 southern half of the State. It fre- 

 quents the same localities and has the same habits 

 as T. parvipennis. Hancock has described a form as variety medialis 

 to which he referred many of the specimens submitted to him from 

 Indiana. This appears to be, in part, a connecting link between 

 parvipennis and lateralis, and an examination of a large series of 

 specimens from all parts of the Eastern United States will probably 

 show that the two species are the same. In that case lateralis would 

 have the priority in name. 



Sub-family TRYXALINiE. 



In the members of this sub-family the vertex is horizontal or a 

 little ascending; the face is decidedly oblique and usually meets the 

 vertex at an acute angle; the lateral foveola) are usually present and 

 well developed, though in a few genera they are absent or invisible 

 from above. The eyes are usually longer than that portion of the 

 cheeks lying below their orbits. The antennae are variable, bemg 

 often depressed, acuminate or clavate, and inserted between the mid- 

 dle or below the middle of the eyes. The dorsal field of the pronotum 

 has its front and hind margins of nearly equal width; the lateral 

 carinae usually distinct; the median carina cut by but one sulcus and 

 never crested, and the surface smooth. The tegmina and wings are 

 often short and imperfectly developed. Long and^short winged forms 

 of the same species are not uncommon. The wings are generally 

 transparent, never bright colored or with a black band. 



