12 STUDIES IN AMERICAN TETTIGONIIDAE (oRTHOPTERa) 



The characters used by us to differentiate the species are 

 easily comprehended, and we feel that the student will have little 

 difficulty in securing from the text, with the aid of the figures, 

 an understanding of the species of the genus. 



ORCHELIMUM ServiUe 



1839. Orchelinium Serville, Hist. Nat. Ins., Orthopt., p. 522. 



1891. Xiphidium Redtenbacher, Verhandl. k.-k. zool.-botan. Gesellschaft 



Wien, xli, p. 493. (In part; not restricted Xiphidion Serville, 1831.) 

 1907. Orchelinium Karny, Abh. k.-k. zool.-botan. Gesellschaft Wien, iv, 



heft 3, p. 82. 



Genotype. — Orchelimum cuticulare ^erviWe = glaberrimmn 

 (Burmeister) (by designation of Kirby, 1906 0. 



Differential Generic Characters.— When compared with the 

 related genus Conocephalus {Xiphidium of authors) the genus 

 Orchelimum is found to differ not in one or several invariable 

 characters, but instead can be distinguished by combinations of 

 characters and a general complex not found in the other genus. 

 In Orchelimum the stridulating field of the male tegmina is larger, 

 broader and in general more extensive, with the lateral section 

 more strongly produced and occasionally almost overhanging 

 (in subgenus Stenorhoptrum less indicated and in Metarhoptrum 

 little different from that found in Conocephalus). The male 

 cerci are never strongly and sharply deplanate distad, instead of 

 generally so as in Conocephalus; the dorsum of the same is 

 occasionally carinate and almost invariably more or less excavate 

 at or near the base of the median tooth (this never found in 

 Conocephalus), while the cerci are also always unidentate instead 

 of untoothed, unidentate or bidentate as in Conocephalus. The 

 male subgenital plate has the distal margin almost always more 

 or less V or U-emarginate, while in Conocephalus this portion is 

 generally more or less truncate. The ovipositor has the ventral 

 margin always arcuate in the distal half except in militare, while 

 in Conocephalus the rule is to have the margins straight. In all 

 the species the prostcrnum is bispinose instead of unarmed as is 

 occasional in Conocephalus, while the distal tibial spurs always 

 number three pairs, instead of less as is found in several subgenera 

 of Conocephalus. 



iSynon. Catal. Orthopt., ii, p. 271,(1906). 



