AMERICAN COLEOPTERA. 211 



gle lateral stria, the latter oval, without lateral stria?. I have seen 

 no example of Mesothes, but specimens of Mesoeoc/opus collaris 

 resemble rather strongly certain species of Cryptorama, and the 

 genus should stand between Catorama and Cryptorama, from the 

 latter of which it differs, aside from antennal formation, in its rather 

 widely exposed met-episterna. Eutheca is also unknown to me in 

 nature, but from description it must be very close to if not iden- 

 tical with our Eupactus, in which case LeConte's name being the 

 older must prevail. 



Anitys should follow Eutylistus in our arrangement. It differs 

 from the latter in its very strongly globose form, sides of pronotum 

 without marginal bead, tarsal joints gradually decreasing in width, 

 short recumbent pubescence, and in several other respects. 



Our genera may be tabulated as follows : 



Anterior coxae expanded at apex into transverse horizontal plates, which are not 

 concealed in repose; the articulation with the trochanter posterior. 

 Metasteruurn with broadly expanded anterior lobe which covers the mouth in 



repose ; hind coxal plates wider internally Petal i urn. 



Metasternum with a short anterior lobe which does not reach the mandibles. 

 Anterior coxae distant; two outer joints of antennal club closely united; 

 mesosternum depressed ; hind coxal plates wider externally. 



Eupactus. 

 Anterior coxae contiguous; two outer joints of antenna] club normally sepa- 

 rated ; mesosternum strongly elevated into a central keel, which is 

 horizontal and attains the level of the metasternum ; hind coxal plates 



narrow and parallel Tlieca. 



Anterior coxae not expanded into apical plates, and entirely shut in in repose; 

 the articulation with the trochanter apical. 

 Anterior coxae contiguous, head impressed or excavated beneath for the an- 

 tennae. 

 Elytra with confused punctuation; metasternum not lobed in front; epi- 

 pleurae not foveate for the hind knees; ventral sutures straight. 

 Antennae 10-jointed ; mesosternum with intercoxal hook-like process; 



metasternal episterna widely visible Catorama - 



Antennae 11-jointed ; mesosternum without intercoxal hook ; metepisterna 

 concealed, or at most very narrowly visible posteriorly. 



Cryptorama. 

 Elytra striate punctate; metasternum deeply narrowly excavated for the 

 middle tarsi, causing it to appear broadly lobed in front; epipleurae 

 foveate for the hind knees; ventral sutures arcuate at middle. 

 Metepisterna narrow, parallel ; pubescence appressed. 



Stichtoptyckns. 

 Metepisterna narrowly triangular; pubescence more or less bristling. 



Protheca. 



TRANS. AM. ENT. SOC. XXXI. JUNE, 1905. 



