206 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



tex is concave with a median carina wliich continues to the end of the 

 body. The tempora are entirely wanting. The frontal costa is a high, 

 narrow ridge just below the vertex, very quickly expanding to form a 

 very narrow deeply sulcate costa with the walls elevated and nearly 

 parallel except on the lower part of the face where they expand slightly. 

 The antennai are short, triquetrous, placed higher than the eyes. The 

 eyes are elongate ovate and are placed nearly horizontally. The ocelli 

 are above the eyes instead of in front of them. The pronotum has 

 all of the carinse distinct and parallel, the median only being cut by 

 the principal transverse incision about one-fourth the distance from 

 the posterior border which is straight. The lateral lobes are vertical, 

 with the lower border straight, the lower angles sharp, the anterior 

 obtuse, the posterior acute, the anterior border very oblique and straight 

 and the posterior border with a reentral angle. Mesosternal lobes 

 approximate, at least behind, in both male and female, metasternal 

 lobes approximate behind in the female, approximate throughout in 

 the male. Tegmina very rudimentary. Supra-anal plate of the male 

 very long and acute, much exceeding the last ventral segment. Pos- 

 terior femora very slender, scarcely compressed, with the apical angles 

 produced. Spines of the posterior tibia minute and very numerous. 

 Inner apical spur of the posterior tibiae much longer than the outer. 



This genus is based upon the single species formerly known asAchu- 

 rum brevipenne, Thos. The genus Achurum was founded upon the 

 species A. sumichrasti, Sauss., and made by Stal to include the closely 

 allied species A. acridodes, Stal, but these species are so radically dif- 

 ferent from R. brevipenne, Thos., in the structure of the posterior 

 femora, and in the last ventral segment of the male, as well as in the 

 tegmina, in the absence of the lateral foveol», and in other particulars, 

 that it makes the erection of a new genus advisable. 



In part, Truxalis (Achurum) Sauss., 1861. Orth. Nov. Am. Ser. 

 11,15. 



In part, Achurum, Stal, 1873. Recen. Orth. I, 89. 



In part, Achurum, Brunner, 1893. Rev. Sys. Orth. 118. 



R. BREVIPENNE, Thos. Fig. la, lb. 



Length (male) 31 mm. (female) 43 mm. 



Tegmina " 4.5 mm. " 5 mm. 



Antennae " 9 mm. " 6.5 mm. 



Post.Fem. " 14 mm. " 19 mm. 



