NO. 1530. THE DECTICINjE F NOR TH AMERICA— CA UDELL. 331 



curved moderately upward and somewhat .shorter or a little longer 

 than the posterior femora, in one species short and sulifalcate. 



Tyjje. — Ei'emopedes sGudderl Cockerell. 



This genus seems to naturally' unite those of our genera of Decticinas 

 having the prosternum unarmed with those having it armed. Some 

 specimens of even the same species have the prosternum wholly 

 unarmed, while others have a pair of short but moderately distinct 

 spines. This makes .some species almost indistinguisha])le from cer- 

 tain members of the previous genus, Stipator. E.specially is this true 

 of Eremopedes halU, which is difficult!}^ separable from St'qxiior sfe- 

 ve7imni, except b}^ the cerci of the males. The extreme superficial 

 resemblance of these two species is the cause of a queer blunder hav- 

 ing been made," 



Eremopedes is very clo.sely allied to Idiostatus, but presents several 

 points of difference. The females of Ereiiropedes generally have the 

 ovipositor more strongly curved upward, and the elj^tra are usually 

 wholly concealed beneath the pronotum, while in rdiostatus they are 

 more or less extended beyond the pronotum. The elj^tra of the males 

 are usually shorter in ErenK^edcs and the lateral carina? of the pro- 

 notum of both sexes are scarcely indicated, while in Idlostatus they 

 are more or less distinct, especially posteriorly. The prosternum. so 

 far as known, is never armed in Idiostatm^ while it is .sometimes in 

 Ereiiioj>edes. 



Doctor Scudder proposed the genus Eremopedes in the year 189-1, 

 but he l)ased it upon an undescribed species, thus giving it no stand- 

 ing. The first species described under the genus was CockerelPs 

 acudderl^ and, according to rules covering such cases, that is therefore 

 the type of the genus. Thus the genus is credited to Cockerell. This 

 view is the opposite of that formerly held by me, but it seems the 

 proper one, as otherwise many changes would result, such as the 

 replacement of Atlanticus Scudder by Engoniasph Brunner, etc. 



There are five species of Eremopedes. They occur mostly in the 

 southwestern United States and seem to l>e nocturnal in habit, hiding 

 by day in nooks, under bark, etc. The species are separable by char- 

 acters giv^en in the following table, given for convenience in two parts, 

 one for the males and one for the females: 



KEY TO THE SPECIES OF EREMOPEDES MALES. 



A. Cer-fi shaped as fig. 37, projecting almost one-half their length bej-ond the last 



aljdoniinal segment scudderi, p. 333 



A'. Cerci shaped as figs. 36 and 3S, projecting hut little beyond tlie la.st abdominal 

 segment. 



B. Smaller, pronotum 6 mm. or less in length ; cerci sliaped as fig. 38 balU, p. 33.5 



B\ Larger, pronotum more than 6 mm. in length; cerci shaped as fig. 36. 



cphippiittd, p. 332 

 The males of hrerkauda and albofusciala unknown. 



«See discussion under Eremopedes halli, p. 336. 



