June, 1S98.] Casey: North American Coleoptera. 77 



The Cioidce consist of two subfamilies, Cioince and Rhipidandrinse, 

 distinguished by clavate and compactly serrate antennce respectively. 

 The American genera of Cioinas are as follows : — 



Antennce 10 jointed 2 



Antennce 9-jointed 7 



Antennce 8-jointed ; body glabrous 8 



2 — Prosternum well developed before the coxae ; lateral edges of the prothorax 



acute to the apex 3 



Prosternum very short and transversely excavated before the coxce; lateral edges of 



the prothorax becoming subobsolete at the apex 6 



3 — The prosternum simple or nearly so 4 



The prosternum tumid or carinate along the middle 5 



4 — Body setose or pubescent the vestiture erect and bristling, the anterior tibice finely 



produced and dentiform externally at apex, sometimes simple Cis 



Body glabrous, the anterior tibice wholly unarmed at apex ; elytral suture margined 

 toward tip ; body elongate, the head rather less deflexed than usual, the head 

 and prothorax simple in the male, the latter with a deep rounded setigerous 



fovea at the centre of the first ventral segment Orthocis 



5 — Body glabrous or with very short decumbent pubescence or inclined setce. 



Xestocis 

 6 — Body very short, oblong-oval in form, with stiff erect pubescence as in Cis. 



Brachycis 

 7 — Body stout, convex, coarsely cribrate and setose; anterior tibice strongly, ob- 

 liquely produced and acute externally at apex Plesiocis 



Body narrow, cylindrical, feebly sculptured and glabrous, the anterior tibice thickened 



and externally rounded and spinulose at apex Ennearthron 



8 — Anterior tibice swollen, rounded and spinulose externally at apex as in Ennear- 

 thron ; head and prothorax strongly modified in the male Ceracis 



Anterior tibice narrowly triangular, the external edge straight throughout and 

 minutely spinulose ; head and prothorax not modified in the male. . Octotemnus 



The term glabrous, as used above, signifies the absence of distinct 

 pubescence; with high power each puncture can be seen to bear a very 

 small hair. Many of Mellie's species are still unknown to me, and 

 the localities of some of them may be open to doubt; a few may possi- 

 bly be synonyms, as, for example, atripennis , which may have been 

 founded upon a damaged specimen of fuscipes. It is possible that the 

 Cis pumicatus of Mellie may prove to be an Octotemnus. Ceracis is 

 very closely allied to Ennearthron, and was indeed considered to be 

 more properly a subgenus by Mellie. The figure of C. sallei, on plate 

 4 of the monograph, seems to have been taken from a specimen of 

 Ennearthron mellyi* 



* I am indebted for several very interesting species of Cioidce to my friend, P. 

 Jerome Schmitt, of Westmoreland county, Pa., and Mr. Wickham has also contrib- 

 uted a number of interesting species in Bostrichince, Cioidce and Sphindidce. 



