SUBFAMILY V. -DECTICIN2B. 



Orthopterans seen. They are much more active during early life 

 than in the mature state when they crawl rather than leap. In 

 captivity they feed as readily upon animal as upon vegetable 

 food, and in the natural state probably feed upon the dead bodies 

 of such small animals as they can find. The earliest hatched 

 reach maturity in central Indiana about the first of June, and 

 may then often be found resting on the leaves and stems of low 

 shrubs and weeds, but seldom climb over two or three feet from 

 the ground. The adults are far less numerous than the young, 

 the vast majority of the latter probably falling a prey to the 

 many ground-frequenting sparrows and other birds, as they do 

 not hide by day as do the members of the genus Ceuthophilus. 



The following key is based largely on that of R. & H. in their 

 Revision, the order being changed to agree with the sequence of 

 the species treated, the language simplified and some additional 

 characters given. 



Fig. 194. Structures of ,-ltlaiiticiis. a i, Dorsal outlines of disk of male pronotum 

 (p) and tegmina (t) when projecting, X 'o! a ls outlines of subgenital plate of female 

 showing shape of notch, X - a > f tcstacciis; b, pachymerus; c, dai'isi; d, monticola; e, 

 americanus; f, gibbosus; g, dorsalis; h, calcaratiis; i, ylabcr. j 1, Outlines of tips of 

 hind tibia; showing the inner apical spurs, X 5- J> tcstaccns; k, ylabcr; 1, calcaratiis. 



( Afur R. & H.) 



KEY TO AMERICAN SPECIES OF ATLANTICUS. 



. Disk of pronotum distinctly narrower near apical third or fourth, its 

 margins or lateral carinae thence distinctly diverging backward, its 

 length never twice the greatest width (Fig. 194, a g.) 

 b. Lateral carina? of disk of pronotum sharp, the angles very dis- 

 tinct; tegmina of male never completely covered by the pro- 

 notum. 



c. Subgenital plate of male angularly emarginate but never deeply 



and narrowly cleft; notch of subgenital plate of female V- or 



U-shaped, the projections each side never long and sublanceo- 



late (Fig. 194, a d) ; cercus of male in front of tooth stout. 



d. Length of exposed portion of male tegmina more than half 



that of pronotum; hind femora less than twice as long as 



pronotum; notch of subgenital plate of female narrowly V- 



shaped, its side projections short, broadly rounded (Fig. 



