Sc-pteiiiber— October iSSS.] 



PSYCHE. 



105 



very readily separated by quite unique 

 charaeters in the $ which were entirely 

 absent in the true Aiioplotnipcs. Fol- 

 l(j\ving the Jekelian phm this newly re- 

 cognized form should be placed as a 

 subgenus between his Ca)itJiotrupes 

 and subgenus Geotnipes for which the 

 name jSIelanotriipes is suggested, and 

 full particulars given further on. 



Geotrupes chalybaeiis is much less 

 convex than usual, the sides of the tho- 

 rax at base moderately explaiiate, the 

 sides of the elytra rather strongly ex- 

 planate in front, the margin being wide 

 as in Melatiotrnpcs and Auoploiriipes^ 

 but flatter ; the epipleur^E are also hori- 

 zontal instead of oblique as usual ; there 

 is within the margin a maiked constric- 

 tion of the sides of the elytra behind the 

 humeri. The most remarkable pecu- 

 liarity of the species is in the form of 

 the middle and hind tibiae. Instead of 

 having the apex on the outer side indi- 

 cated b}- a vvell-defined ridge as usual, 

 tlie ridge is completely absent, and only 

 its position is indicated by two or three 

 bristles, so that the apex as seen from 

 above or below is broadly rounded or 

 very obliquely truncate. This character 

 appears to be quite anomalous in Geo- 

 trupes, as, if it had existed in anyof the 

 species known to Jekel it would have 

 been noticed, as he is very particular in 

 giving the form of the tibiae and the 

 number of transverse ridges on the outer 

 face counting the apical as first. Some 

 further particulars will be given under 

 this species below. The name Pelto- 

 triipes might be used for this subgenus. 



The following arrangement of the 



subgenera is based upon Dr. Horn's, 



given in the " Transactions," vol. i. 



a. Middle and hind tibiae with apical 



ridge on the outer side. 



/;. Apterous, elytra connate, me- 



tasternum short, thorax dissimilar 



anteriorly in the two sexes, el>tia 



not striate. Mycotrupcs. 



bb. Alate, ehtra free, thorax similar 

 $ and 9 . 



c. Elytral margin moderate, an- 

 tennae with the second joint of 

 the club normal, entire, apex of 

 anterior tibiae produced inwardly 

 in. the $ , simply toothed in 

 the 9 . 



d. Middle tarsi of tlie $ very 

 short and thick, claws of the 

 same chelate. Onychoti-upes. 



dd. Aliddle tarsi and claws of 

 the $ normal. Cnemotritpes. 



cc. Elytral margin broad towards 

 the base, second joint of antennal 

 club more or less emarginate or 

 truncate beneath, but sometimes 

 not distinctly so, sutural stria 

 reaching the base, second in- 

 terrupted, apex of anterior tibiae 

 alike in both sexes. 



e. $ with anterior thighs tooth- 

 ed at base, anterior tibiae 

 with the third tooth from the 

 apex deflexed, partly inferior. 



]\/ela?iotnipes. 

 ee. The sexes alike. 



Anop/otrupes. 



aa. Middle and hind tibiae without 



external apical ridge. Peliotrupes. 



