June i 9 oo.] Casey : On North American Coleoptera. 63 



of the club, and there is no vestige of an enlargement of the second 

 joint before the club as there is in Rypobius, Gronevus and Ortho- 

 perns. The structure of the shaft differs in fact very radically, and, 

 in this way, these genera are widely isolated. Corylophodcs resembles 

 Bathona in general structure, but, besides the characters indicated in 

 the table, it differs in the generally more narrowly oval form of the 

 body, shorter and less developed prothorax, finely margined along the 

 basal lobe, and more slender and less coarctate five antennal joints 

 immediately succeeding the third. The tarsi are nearly similar, but 

 the anterior are feebly dilated in the male. The three species before 

 me may be thus distinguished among themselves : — 



Elytral punctures sparse but rather coarse, deeply impressed and very distinct, black- 

 ish-piceous, the limb of the pronotum broadly transparent and hyaline ; legs and 

 antennae paler. Length 0.9 mm. ; width 0.72 mm. Rhode Island, Pennsyl- 

 vania and North Carolina (Asheville) marginicollis Lee. 



Elytral punctures extremely minute and subobsolete 2 



2 — Form narrowly oval, rufo-piceous in color, the pronotum with broad hyaline 

 margin as in the preceding and succeeding species. Length 0.85 mm. ; width 

 0.65 mm. Florida impunctatus, sp. nov. 



Form more broadly oval, black, the legs, trophi and antennae pale ; prothorax trans- 

 verse, the basal angles obtusely blunt as usual. Length 0.8-0.9 mm. ! width 

 0.7-0.75 mm. Texas (Brownsville) SUbtropiCUS, sp. nov. 



As pointed out by Mr. Matthews, the distinguishing feature of Cory- 

 lophodcs is the slender third antennal joint shorter than the second, 

 but the author makes no allusion at all to the remarkable post-coxal 

 plates. The genus as extended by its author in the " Monograph" is 

 very composite, and I am unable to place the C. schwarzi, described 

 therein from California. 



Gronevus, gen. nov. 

 This and the succeeding genus differ very greatly from the two pre- 

 ceding, in the very short and almost obsolete post-coxal plates, the 

 meso-coxal being even much less developed than in Orthoperus, but 

 the subtransverse line at the base of the metepisterna is present as 

 in that genus ; the comparatively wide and steeply inflexed epipleurse 

 distinguish them at once however from Orthoperus and Eutrilia. They 

 also differ quite radically in antennal structure, and from all others of 

 the tribe, in the shorter and slightly dilated tarsi. In Gronevus the 

 limb of the pronotum is hyaline and moderately widely subexpla- 

 nate, the base not margined, and the hind angles are acute and dis- 



