60 Journal. New York Entomological Society. [Vol. vm. 



7 — Minute in size, blackish, the elytra gradually rufescent behind the middle, 

 sparsely, finely and very obsoletely punctate, the punctures almost effaced ; legs 

 yellow ; abdominal plates well developed, extending almost to the middle. 

 Length 0. 7 mm. ; width 0.47 mm. Oregon exigUUS, sp. nov. 



CORYLOPHID^. 



The Corylophidae constitute a small family, evidently allied to the 

 Silphidas, as shown by antennal structure, and, like them, display 

 great variety in external habitus ; they are, however, remarkably 

 homogeneous among themselves in sternal and abdominal structure. 

 In Orthopenis a relationship with Scaphidiidse can be observed, and 

 there are some characters, such as the 4-jointed tarsi with the third 

 joint small, the post-coxal plates of the Corylophini and the project- 

 ing rounded pronotum of the Parmulini — homologous with Crano- 

 phorini, — which proclaim an indubitable relationship with the Coc- 



Fig. 2. — Antennse of Cokvlophid.e — 1 Bathona {Corylophodes is similar, except that the 

 third joint is shorter than the second); 2 Gronevus (also nearly of Rypobius): 3 Sericoderus ; 4 

 Orthoperus ; 5 Kutrilia ; 6 Molamba lunata ; 7 Molamba obesa ; S Sacium montanum ; 9 Ar- 

 throlips nun ins : 10 GEnigmaticum californicum. 



cinellidoe. The chief difference in tarsal structure between these two 

 families resides, indeed, simply in the freedom of the third joint, 

 this being generally anchylosed to the fourth in Coccinellidae. The 

 anterior coxae are narrowly separated, displaying variations which 

 serve to define tribal groups, and the cavities are brOadly closed be- 

 hind ; the intermediate are more widely separated and the posterior 

 mutually very remote. The scutellum is always distinct, though 

 small, the abdomen hexamerous, the first segment being much the 

 longest and the palpi short, stout and acuminate. The American 

 species may be assigned to four tribes as follows : — 



