of the North American Orthoptera. 433 



form quite a distinct feature of the North American 

 Orthopteran fauna. I was able to show there that R. 

 xanthostomd) Scudd. should not be united in the same 

 genus with the others, and that R. subterranea, Scudd. had 

 features in its structure which lacked conformity with those 

 possessed by other members of the genus. A closer and 

 more extended study has convinced me that there are 

 here three well-marked genera, and that no one of them 

 can properly be referred to Rhaphidophora. Ceuthophilus 

 may be applied to the more abundant forms, living in 

 concealment under stones, with which must be associated 

 R. stygia, Scudd., found in the shallow Hickman's Cave ; 

 of this genus I am acquainted with no less than twelve 

 species, besides one which I have not seen, Phal. scabripes, 

 Hald., undoubtedly belonging here. Under the genus 

 Hadenoecus we may place R. subterranea, Scudd., restricted 

 to the deep caves of Kentucky, while Tropidischia is pro- 

 posed for the genus under which R. xanthostoma^ Scudd. 

 of California, should be placed. 



CEUTHOPHILUS, Nov. gen. (mtfof, <j>ttog). 



Head rather large, oval; antennas long, slender, cylin- 

 drical ; first joint as broad as long, larger and stouter than 

 the rest, which are about equal in thickness, gradually 

 tapering to the extremity; second quite short; third long- 

 est; the remainder unequal. Eyes subpyriform, subglo- 

 bose, crowded against the first swollen joint of antennas. 

 Maxillary palpi long and slender; first two joints equal, 

 smallest; third fully equal in length to first and second 

 together ; fourth three-fourths as long as third ; fifth nearly 

 as long as third and fourth together, somewhat curved, 

 swollen towards extremity, split on the under side almost 

 its entire length. Sides of the thoracic nota broad, mostly 

 concealing the epimera ; wings wanting ; legs rather long ; 

 coxae carinated externally, the third pair but slightly, the 



JOURNAL B. S. N. H. 55 NOVEMBER, 1862. 



