IO6 CONNECTICUT GEOL. AND NAT.- HIST. SURVEY. [Bull. 



The species of this sub-family occurring in Connecticut are 

 readily distinguished by the presence of a distinct spine or 

 tubercle on the prosternum between the legs of the front pair. 

 The head is smaller and less swollen than in the two preceding 

 sub- families, and the face (in our species) is nearly perpendicular. 

 The disk of vertex is never depressed, the lateral carinse are low, 

 rounded, or often absent. Foveolse often wanting or indistinct. 

 The disk of pronotum without tubercles or wrinkles, the hind 

 margin usually broadly rounded but never acute-angled. Median 

 carina low, sub-equal throughout, lateral carinae usually rounded 

 or obsolete. Tegmina are present in our species, and, while 

 usually well developed, are in a few species very short. The 

 inner wings usually transparent, not bright colored. The pre- 

 vailing color of most of the species of this sub-family is dull 

 olivaceous brown, though some are mottled with delicate colors, 

 yellow, green, reddish, or purple. 



Among the Acridina are the most abundant and injurious 

 insects of the whole order. Nearly all of the species pass the 

 winter in the egg stage and begin to reach maturity in early 

 June, though most species are not common until July. " The 

 males of the Acridina rarely stridulate, and then only when at 

 rest, by rubbing the inner surface over- the outer surface of the 

 tegmina." 



Key to Genera. 



1. Size small, tegmina not over 25 mm. in length. Lobes 



of mesosternum transverse or equally long and broad. 

 The inner margin usually rounded ............... 2 



Size larger, tegmina 27 mm. or more in length. Lobes 

 of mesosternum longer than broad, the inner margin 

 straight ......................... Schistocerca p. 107 



2. Color usually dull, largely brownish or olivaceous. 



Vertex at its narrowest point between the eyes more 

 than twice the width of the second antennal joint. 

 Sub-genital plate of male without a sub-apical tubercle 3 

 General color when fresh bright pale green, with a 

 conspicuous narrow purple mid-dorsal line generally 

 on the head, extending across the pronotum and the 



