THE GENUS THIONIA STAL 



This genus is especially well represented in Central and 

 South America. Of the seven species ocurring in the United 

 States, only four, bullata, simplex, elliptica, and quinquata 

 are known from the Southern States. 



Briefly characterized as follows: Body usually long, at times 

 short, strongly built. Head with the eyes as wide as the thorax. 

 Vertex not produced beyond the eyes, the lateral edges not sharp, 

 the anterior margin nearly straight. Frons vertical, as wide as long 

 or longer than broad, somewhat narrowed between the eyes, tricari- 

 nate, the lateral carinae curved, united above with the median carina; 

 clypeus convex. Antennae short. Ocelli present. Elytra long or 

 short, extended reaching beyond the apex of abdomen, narrowed and 

 rounded behind; the longitudinal veins run rather straight, curved 

 more or less strongly in the apical region with the convexity in- 

 wards; the radial nerve consists of two long simple veins; the inner 

 ulnar always simple, the outer is forked before the middle; cross- 

 veins are not numerous, mostly simple and very little branched; a 

 forked vein in the clavus. Wings present. Hind tibiae with two spines. 



Logotype of the genus: Thionia longipennis (Spin.) 



Key to the species of Thionia 



1. General color pale green; frons with a single median keel, 

 simplex Germ. 



... General color dark brown, spotted, 2. 



2. Frons about a third longer than wide, with a single median keel, 



7.50 mm. elliptica Germ. 



Frons quadrate, tricarinate, the outer carinae curved somewhat 

 bow-shaped, 6.50-7 mm., bullata Say 



... Frons tricarinate, narrow, the lateral margins a little arched, 

 quinquata Metcalf 



Thionia bullata SAY 



(1830 Jr. Acad. Nat. Sci. Phila., vi, p. 240; Compl. ii, p. 375, 



Plata) 



Recorded from Ont, N. Y., N. J., Pa., D. C., Ga., Fla. 

 and Ohio. 



Somewhat elongate oval, yellowish-brown, spotted with pitch brown. 

 Vertex as long as wide, nearly straight in front, flat, with two shallow 

 depressions posteriorly; a median groove-like depression. Frons longer 

 than broad, widened below, being distinctly broader towards the apex 

 than between the eyes; the anterior margin fuscous. Frontal sur- 

 face weakly curved, the distinct median and lateral carinae of which 

 extend onto the long, triangular clypeus; the lateral carinae some- 

 what curved inwards towards the apex; the genae separated from the 



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