June, 1898] 
Casey : North American Coleoptera. 
77 
The Cioidse consist of two. subfamilies, Cioinoe and Rhipidandrinse, 
distinguished by clavate and compactly serrate antennae respectively. 
The American genera of Cioinae are as follows: — 
Antennae 10 jointed .. 2 
Antennae 9-jointed. 7 
Antennae 8-jointed ; body glabrous.8 
2— Prosternum well developed before the coxae; lateral edges of the pro thorax 
acute to the apex.. 
Prosternum very short and transversely excavated before the coxae; 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 tibiae finely 
produced and dentiform externally at apex, sometimes simple.Cis 
Body glabrous, the anterior tibiae 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 setae. 
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 tibiae strongly, ob¬ 
liquely produced and acute externally at apex.. Plesiocis 
Body narrow, cylindrical, feebly sculptured and glabrous, the anterior tibiae thickened 
and externally rounded and spinulose at apex.Ennearthron 
8— Anterior tibiae swollen, rounded and spinulose externally at apex as in Ennear¬ 
thron ; head and prothorax strongly modified in the male.Ceracis 
Anterior tibiae 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. sal/ei, 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 Cioidse to my friend, P. 
Jerome Schmitt, of Westmoreland county, Pa., and Mr. Wickham has also contrib¬ 
uted a number of interesting species in Bostrichime, Cioidae and Sphindidce. 
