Casey — A Revision of the American Paederini. 235 



margin; hind tarsi ratiier elongate but distinctly shorter than the 

 tibiae, the basal joint much elongated but shorter than the remain- 

 der; head more or less broadly arcuato-truncate at base; sculpture 

 only moderately coarse, the head and pronotum strongly punctato- 

 reticulate, the elytra and abdomen asperately punctate; body more 



or less slender. Europe, Asia and North America Snnins 



Labrum advanced and prominent toward the middle, the teeth moderate in 

 size, broadly triangular, each with a longer and very slender seta project- 

 ing from its apex, the teeth separated by a moderate emargination, the 

 transverse bottom of which bears two very minute approximate den- 

 ticles, each of which has a long slender tactile seta projecting from its 

 apex; just without each of the principal teeth there is a small, angulale 

 emargination of the edge ; prosteruum long, nearly flat, not transversely 

 tumid but with a very small cariniform elevation paralleling and close 

 to the apical margin, the median line from this carina to the coxae 

 strongly carinate; posterior tarsi short, very much shorter than the 

 tibiae, the basal joint much elongated and as long as the entire remain- 

 der; anterior tarsi of the male thicker though scarcely dilated, the sub- 

 apical joints somewhat obliquely united, — suggesting Pinophilus; 

 head prolonged and strongly rounded at base; sculpture of the head 

 and pronotum consisting of large reticulations of somewhat feeble lines, 

 of the elytra of distinct, rather coarse and sparse impressed punctures, 

 the abdomen obsoletely and very finely, sparsely punctulate. Central 

 America *Dibeloiietes 



The diagnosis of Nazeris Fauv., has been taken from a 

 female of pallicUpes Eeit., and that of Dibelonetes Sahl., from 

 the male of a form which appears to constitute a variety of 

 the Central American fragilis Shp., from San Marcos, 

 Nicaragua. 



I greatly regret not being able to study the genus Cteno- 

 mastax Kr., in order to determine its relationships, but this 

 remark also applies to several other described genera. 



Sunius Erichs. 



Numerous species of this genus, frequently closely allied 

 among themselves, occur throughout the continent and are 

 everywhere plentiful in individuals. They have in common 

 a very monotonous uniformity of habitus which, in connec- 

 tion with their small size, has caused them to be greatly neo-- 

 lected by systematists. The ornamental coloration of many 

 forms is highly inconstant, especially so in the Texan incon- 

 stans, and, in americanus and some others, the abdomen, 



