AMERICAN COLEOPTERA. 261 



as long as wide, fourth to seventh strongly transverse, very com 

 pactly joined, together less than twice as long as their width ; eighth 

 to tenth forming a broad club much longer than all the preceding; 

 eighth transversely triangular, more or less emarginate on apical 

 edge, about as long as the six preceding; ninth similar but less 

 strongly transverse; tenth elongate oval Prothorax evenly con- 

 vex, sides nearly straight. Elytra with two nearly entire marginal 

 stria?, and in some species a shorter basal third stria. Prosternum 

 short, concave, produced behind into two long more or less widely 

 separated processes, which fit into excavations of the mesosternum. 

 Anterior coxa? widely distant, perpendicular, entirely concealed in 

 repose. Mesosternum deeply excavated and largely concealed under 

 the metasternum, which is more or less channeled longitudinally, 

 and produced between the widely separated middle coxae in a short 

 broad lobe, which is squarely truncate in front and more or less nar- 

 rowed behind by the tarsal grooves. Ventral sutures anteriorly 

 arcuate at middle, deeper at sides. Tibia? not compressed. Tarsi 

 short, first joint as long as the two or three following, these very 

 strongly transverse and somewhat emarginate ; terminal joint longer, 

 stout. 



I have restricted this genus to those species in which the proster- 

 num is produced behind into two long slender horn-like processes. 

 This peculiar structure is not mentioned in any of the European 

 works to which I have had access, and though properly described 

 by LeConte in his diagnosis of Dorcatoma, more than half of the 

 species referred by him to this genus do not possess this character. 

 Of the species on our present list incomptum, tristriatum and granum 

 have therefore been removed from Dorcatoma, and with intermedium 

 erroneously referred by LeConte to Coznocara, and several unde 

 scribed species are made to constitute the new genus Eutylistus 

 herein described. 



Our species of Dorcatoma * are then three in number, separable 

 as follows : 



"*" Of the eight European species of Dorcatoma, five — dresdensis, setosella, chryso- 

 melina, serra and dommeri — are before me. The first four of these are doubtless 

 true members of the genus, though I have verified the existeuce of the proster- 

 nal horns in the first two only. Dommeri would fall in Eutylistus. Of the three 

 remaining species, punctnlata and flavicomis I should judge from their relations 

 to the above, were properly referred ; of lanuginosa I know nothing. 



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



