Coleopterological Notices. 329 



Colposcelis, Calyptopsis, Captiisa and others, is distinguished by 

 the narrow but truncate abdominal process, the short broadly oval 

 and outwardly pointed posterior coxae, a complete obliteration of 

 the metasternal groove, the entire and universal absence of wings, 

 and the thicker and denser integuments. In the genus Capnisa, 

 however, there is a feeble indication of the groove as a very fine 

 short impressed line opposite the inner part of the coxae ; this simply 

 denotes that Capnisa may have a remote line of affinity with some 

 other tribe, and is a matter of but little consequence when developed 

 to such a rudimentary degree. It will require but a short study 

 of the European genera, in conjunction with that of the single 

 genus Eurymetopon, to show that the nature of the front is of 

 quite uncertain value in a tribal sense. 



Edrotes must be placed in a distinct tribe on account of its very 

 peculiar mesosternal structure, but I can perceive no great necessity 

 for separating Craniotus from the Gnathosiini, except it be the more 

 widely separated posterior coxae. 1 Usecnus should be united with 

 the Zopherini. 



Thinobates. 



The two genera at present composing this group of the Epitragini, 

 as represented in the United States and Mexico, are both extremely 

 heterogeneous and are resolvable into some eight or nine distinctly 

 limited sections, which are at least of subgeneric value. All of the 

 species are more or less local and most of them extremely so ; indeed 

 the entire genus Eurymetopon is very circumscribed in habitat, 

 being confined to the country bordering the Mexican boundary of 

 the United States to the westward of San Antonio in Texas, and 

 with its principal focus in southern Arizona. Emmenastus, how- 

 ever, is more widely diffused, extending from the southwestern parts 

 of the United States through Mexico and Central America and 



1 The acute and prominent lateral lobes of the front, urged by Horn (Trans. 

 Am. Ent. Soc, 1874, p. 29) as an important tribal character, is apparently not 

 entitled to such rank ; the same difference can be observed between the front 

 of Epitragus submetallicus and E. pruinosus ; the form of the metasternal epis- 

 terna also seems to have been given too great value in this connection. The 

 genus is quite abnormal, however, and should certainly constitute an isolated 

 group of the tribe Gnathosiini. 



