440 Materials for a Monograph 



erally, slightly curved, and split on the underside only 

 at the tip. Tubercle of the vertex very small, pointed, 

 bilobcd. Epimera of the meso- and metathorax not cov- 

 ered by the sides of the meso- and metanotum ; wings 

 wanting ; metasternum with a short sharp spine ; legs re- 

 markably long and slender; coxae carinated externally, the 

 first pair having the carina elevated in the middle to a point ; 

 femora without spines ; hind femora turned inwards and 

 a little swollen at the base, extending over only the basal 

 half; under-sarface delicately channelled; the two anterior 

 tibiae are slightly longer than their corresponding femora ; 

 tarsi much compressed laterally ; anal cerci long and slen- 

 der ; ovipositor long and slightly ensiform, rounded off 

 very gradually at the extremity to a delicate point. 



This genus differs from Rhaphidophora in the propor- 

 tional lengths of the joints of the maxillary palpi, in the 

 want (3f spines on the first two pair of femora, and the 

 peculiarity of character in those of the posterior tibiae and 

 basal tarsal joint, as well as the shape of the latter, in the 

 convexity of the eyes, and in the non-development of 

 spines on the coxae of the mesothoracic legs ; most prob- 

 ably Rap/lid. palpata, Charp., of Europe, belongs to this 

 genus. 



1. H. SUBTERRAxNEA. 



Rapkidophora subterranea. Scudd., Proc. Bost. Soc. Nat. 



Hist. ; VIII. 8. (1861.) 

 Mammoth Cave, Kentucky, (Hyatt, D. C. Scudder.) 



THOriDISCHIA, Nov. gen. [Tpomg, iaxia). 



Head similar to Ceuthophihis \ antennic long and slen- 

 der, about three times the length of the body ; first joint 

 large and stout, considerably longer than broad ; second 

 much smaller but broader than the succeeding ; third long 

 and slender, narrowing anteriorly, the rest unequal ; eyes 

 subovate, very globose, slightly removed from the basal 



