72 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



6. Sides of pronotum elongated, the length on dorsal 



margin greater than the depth (Fig. i8a) 7 



Sides of pronotum not elongated (Fig. i8b) 8 



7. Sides of pronotum nearly vertical, flat above, lateral 



carinse parallel throughout (Fig. 17a) 



Dichromorpha p. 76 

 Sides of pronotum convex above, lateral carinas slightly 

 divergent behind (Fig. 17b) Clinocephalus p. 'jy 



8. Lateral carina more or less divergent before and be- 



hind (Fig. 20). The middle foveolse usually present 



on front edge of vertex (Fig. 21) Orphulella p. 78 



9. Tegmina without well developed intercalary vein. 



Median carinae of pronotum not high or sharp, and 



not cut in front of middle by principal sulcus 



Stenobothrus p. 83 

 Tegmina with well developed, elevated, intercalary vein. 

 Median carina of pronotum rather high and sharp, 

 cut plainly in front of middle by principal sulcus 

 (Fig. 25) Mecostethus p. 84 



Tryxalis Fabricius. 



Head with the vertex horizontal, the front rounded and pro- 

 jecting beyond the eyes to the distance between the eyes. Median 

 carina faint. Lateral foveola absent. Face very oblique. An- 

 tennae flattened at the base, tapering to a point, and about as 

 long as the head plus the pronotum. Pronotum with the disk 

 flat, the median and lateral carinae distinct and parallel. Median 

 carina cut behind the middle. Lateral lobes of the pronotum 

 parallel and perpendicular, slightly longer than high, the front 

 and hind margins sloping towards each other ventrally. Wing 

 covers usually extending much beyond the end of the abdomen. 

 Hind femora long and slender. Tibiae with only twelve spines 

 on exterior margin. 



T. brevicornis Linnaeus. Short-horned Locust. Plate 

 VH, 12. 



The females are usually either pale green dotted with brown, 

 or pale brown. The males are much smaller and usually have 

 the dorsal surface, face, fore and middle legs, and face of hind 



