218 Mr. Westwood on the Affinities of Clinidium. 



" tis;" and Mr. Kirby describing the Clinidium as taken in a rotten tree. 

 Or if we direct our attention to structure, we find the same formation of 

 antennae and labrum, the same long and acute terminal joint of the 

 maxillary palpi and minuteness of mandibles, maxillee, labium, and la- 

 bial palpi, the same subdepressed body, the similar neck, the same 

 shortness of legs, apparently the same spinosity at the tip of the tibiae, 

 and the same number of joints in the tarsi. 



Such are the chief resemblances, constituting a very intimate affinity ; 

 but there are numerous points of disagreement, although not of such 

 material importance, between the two genera. 



Their geographical distribution is distinct, Clinidium being an inhabit- 

 ant of the tropical regions of the islands of the New World, whilst Rhy- 

 sodes appears to be distributed throughout the southern half of Europe, 

 the habitats given by Dalman being " Warnaus Blekingiae," Tauria, the 

 Croatic Alps; " et ut Americae Borealis — an recte? — communicavit Dom. 

 " Sturm." In addition to which list M. Lefebvre has captured it in pro- 

 fusion in Sicily, and Latreille informs us that M. Leon Dufour has disco- 

 vered it in the Pyrenees. 



We also find a material variation in the formation of the mentum, 

 which in Clinidium (notwithstanding the inability under which Mr. Kirby 

 laboured to state the formation of the trophi so accurately as he could 

 have wished) is described as being " latum, utrinque tumidum,"* whilst 

 in Rhysodes it is flat and " antice sinuatum lobo medio acuto," forming, 

 in fact, the under side of the head, as represented fig. 1, A. The presence 

 of reticulated eyes in Rhysodes is also a distinguishing character, if these 

 organs be really wanting in Clinidium ; upon which question I must beg 

 to refer the student to the observations of Mr. Kirby and those suggested 

 above. In their general outline also, there is a considerable difference, 



* It is material, for the purpose of tracing the affinities subsequently slated, 

 to notice this formation ; and a question may arise whether this tumidity is not, 

 in fact, the bilobed production of the anterior part of the under side of the 

 head, and whether the lower lip and its appendages do not arise between the two 

 lobes as in Passandra, &c. Should, however, the mentum be transverse, and 

 merely swelled on each side, this circumstance of itself evidently shows an 

 approximation to the swelled bilobed formation of the under side of the head 

 in those genera. 



