of the North American Orthoptera. 441 



joint of antennae ; maxillary palpi, long and slender ; first 

 and second joints short, the second a little the longer; third 

 more than twice the length of the second ; fourth nearly 

 as long as third ; fiftii nearly equal to third and fourth 

 together, a very little curved, swollen at the tip, and split 

 a little way down the under-side ; tubercle of the vertex 

 small, but sharply prominent, deeply bisected ; sides of the 

 thoracic nota shorter than in Hadenascus, the meso- and 

 metanotum not extending downwards so far as the pro- 

 notum ; wings wanting ; legs long and slender, especially 

 the hindmost pair ; the coxsb have the lower edge pro- 

 duced on the inner side to a small duM spine, and they are 

 also carinated externally, the carinae of the pro- and meso- 

 thorax being produced to a spine as in Ceuthophilus ; the 

 femora and tibiae are four-sided, and have all the edges 

 minutely and closely spined, except the posterior femora ; 

 these are swollen, though not heavily, at the basal portion, 

 which is not turned inwards, as in the two preceding 

 genera, and has the rectangular spinous character of the 

 other femora upon the terminal half, and even affecting 

 the swollen portion ; the under-surface is deeply and nar- 

 rowly channelled ; the two anterior tibiae are somewhat 

 longer than their corresponding femora ; there are no 

 heavy spines upon any portion of the legs except upon 

 the extremity of the hind tibiae where there is a pair of 

 moderately long ones ; tarsi much compressed laterally ; 

 anal cerci blunt, channelled interiorly. 



This genus differs from Raphidophora in the character of 

 its maxillary palpi, the absence of any peculiar develop- 

 ment of spines upon the legs, in the shape of the joints of 

 the tarsi, and the globosity of the eyes. 



1. T. XANTHOSTOMA. 



Raphidophora xanthostoma, Scudd., Proc. Bost. Soc. Nat. 



Hist. ; VIII. 12. (1861.) 

 Crescent City, Cal. (A. Agassiz.) 



JOUKNAL B. S. N. U. 56 NOVEMBER, 1862. 



