Mr. Westwood on the Affinities of Clinidium. 215 



CokopteraJ and the attempt which I have made to render the structure of 

 already described insects more fully known, will be held a sufficient re- 

 compence for the want of novelty. 



In tracing affinities, perhaps, no organs are of such essential import- 

 ance as the trophi, and it is consequently to be regretted, that as Mr. 

 Kirby's specimen of 



Clinidium Guildingii. 

 was not dissected, some of the most material parts of the mouth remain 

 uninvestigated. I beg, however, to call the student's attention to the 

 characters given by Mr. Kirby of the mandibles, terminal joint of the 

 maxillary palpi, and especially the " Mentum latum, utrinque tumi- 

 " dum," and the delineation of this latter organ in Plate II. fig. 2. The 

 apterous body which is not depressed, the apparent want of reticulated 

 eyes, and the levigated spaces regarded by Mr. Kirby as their representa- 

 tives, the formation of the tips of the tibiae, and the pentamerous tarsi, are 

 also characters which the student will not fail to consider worthy of attention. 



After the observations of Mr. Kirby on its want of affinity with the 

 families referred to in his paper, it was with pleasure that I received an 

 insect from Germany, singularly enough on the very day on which the 

 account of the Clinidium Guildingii was published, which, even upon a 

 casual examination, appears to bear so great an affinity to that insect, 

 that I have little doubt that the time is not long passed when they would 

 both have been even considered referable to the same genus. It is equally 

 singular that the situation of the former insect has hitherto equally 

 been matter of doubt with the authors who have noticed it. 



The insect to which I refer is the 



Rhysodes exaratus. 

 Tab. Supp. xlvi, fig. 1. 

 The genus was proposed (but not described) by Latreille, and adopted 

 by Iliiger, Gyllenhal, Sturm, and other authors ; but it was reserved for 

 Dalraan to give in the Analecta Entomologica, p. 93, an elaborate and 

 detailed account of the interesting insect composing the genus. This de- 

 scription being unaccompanied by any figure, and the insect not having 

 been elsewhere figured,* I feel convinced that a representation of it will 

 not be considered an uninteresting accompaniment to Mr. Kirby's figure 

 of Clinidium. There are, however, certain material characters not suffi- 

 * See Note A. 



