SUBFAMILY V. DECTICIN/E. 587 



pear to be omnivorous in their choice of food, and, when kept in 

 captivity, even cannibalistic. They are foimd for the most part 

 in dry, upland open wooded districts or mountainous regions, 

 where they are active during the day. On account of their com- 

 paratively wingless condition they probably do not wander far 

 from their hatching place. In color they are usually a dull gray- 

 ish- or yellowish-brown, their hues thus corresponding closely 

 with the dead leaves and other herbage of their abiding places. 

 As the males stridulate only at night, and the adults of both 

 sexes move slowly and only when closely approached, they are 

 seldom seen and are probably more plentiful than they appear to 

 be. The principal literature pertaining to the subfamily which 

 will be of interest to the American student is as follows: Her- 

 man, 1874; Scndder, 1894a ; Caudell, 1907, 1908; Rehn & He- 

 bard, 1916a. 



KEY TO EASTERN GENERA OF DECTICIN."E. 71 



a. Ovipositor straight or nearly so (Fig. 195) ; tegmina of male shorter 

 than pronotum; prosternum usually armed with a pair of spines; 

 lateral lobes longer than deep. I. ATLANTICXJS. 



00. Ovipositor distinctly curved upward (Fig. 199); tegmina of male 



longer than pronotum, sometimes fully developed; prosternum 

 unarmed; lateral lobes as deep as long. II. IDIONOTUS. 



1. ATLANTICUS Scudder, 1894a, 179. (Gr., "a mythical island.") 



The members of this genus possess the characters of the sub- 

 family above given. In addition they have the head of medium 

 size, not prominent, disk of pronotum much produced behind over 

 the base of abdomen, front margin truncate; lateral carime al- 

 ways evident, sometimes gently rounded, again sharp and prom- 

 inent; lateral lobes longer than deep, their front margins nearly 

 straight and vertical, lower one short, oblique, the angle between 

 the two obtuse, lower hind angle broadly rounded, hind margin 

 long, oblique and sinuate; tegmina of male vaulted, overlapping, 

 their stridulating field large but mostly concealed beneath the 

 pronotum; tegmina of female wholly concealed; fore femora un- 

 armed or with one to five spines on outer lower margin ; hind 

 femora variable in length and stoutness, their lower margins un- 

 armed, or the inner one with several spines; last dorsal segment 

 deeply emarginate at middle, the notch enclosing the small tri- 

 angular or rounded deflexed supra-anal plate. Cerci of male 

 subcylindrical, variable in length and thickness, armed within, 



71 A single specimen of Pediodectes (Stipator) nigromarginata ('amldl, is recorded by 

 that author ( 1907, ,!4<>) as being in the Scuclder collection from Georgia, but it cannot 

 be found and the record is probably erroneous, the species being otherwise known only 

 from Kansas, Oklahoma and Texas. 



