292 REVISION OF THE TENEBRIONIDJE OF AMERICA, 



COELUS, Each. 

 i .1 ins. Esch., Zool. Ail. III. p. ",. 

 I . cilia tus, Esch., Zool. Atlas Heft. III. p. 5, pi. II, fig. 1. 



C. globosus, Lee, Ann. Lye. 5, 183. 



This species differs from the preceding in being more broadly oval and more convex. 

 The sides of the thorax arc also more strongly rounded. These differences appear to be 

 very feeble, and in a larger series may vanish. Both specie-, are found mi the sea shore 

 el' California. 



ETJSATTUS, Lee. 



Eusattus, Lee, Ann. Lye. V.. p. 181. 



Discodemus, Lee, Class. Col. X. A., p. 223. 



( lonipinus, Lee., ibid. 



The last two genera indicated by Dr. Leconte in his Class, of the Coleoptera of North 

 America, and subsequently reunited under Eusattus (List, p. 60), cannot be retained as 

 distinct, affording an illustration of the little value a character may have in a tribe after 

 having been found to be of great importance in tribes not remotely separated. Instances 

 ol' this kind are by no means of rare occurrence in Tenebrionidae. In this instance the 

 relative width of epipleura and elytra! fold have been assumed as the points of separation, 

 and with species mi closely allied in all other important generic characters, I have deemed 

 it more prudent to adopt the later view' of Dr. Leconte, rather than establish two other 

 genera in addition to the above-mentioned. From an inspection of the following table it 

 will be seen that but one species is needed to complete a series uniting all the forms of 

 epipleura-. viz : a species between robustm and reticulatus, in which the epipleura shall 

 occupy nearly the entire indexed portion of the elytra by being gradually wider from apex 



to base. The presence or absence of a prominent elytra! margin appears t rather oi 



specific than generic value. When scientific zeal shall cause northern Mexico to be more 

 thorougly explored, species will be found which will without, any doubt fully confirm the 

 view here adopted. With the present illustration before us, it is to be hoped that stu- 

 dents of local fauna? will give the subject of genera due consideration, ft must be borne 

 in mind that in Tenebrionidie a want of stability of characters is one of the most marked 

 peculiarities of the family, and in the present paper, nearly a hundred new genera could 

 have been described from characters for which abundant precedents could have been found. 



Our species may be arranged as follows; 

 Elytra with a distinct, more or less acute margin. 



Epipleura occupying entirelj the indexed portion of elytra. robust us. 



Epipleura narrow, suddenly dilated at base. 

 Epipleura and elytra! fold nearly smooth. 



Elytra faintly sub-costate with interstitial reticulations, r c t i e ulatus. 



