196 Bulletin American Museum of Natural History. [Vol. XXXVII, 



Family III. DYTISCIDyE. 



Megadytes fraternus Sharp. Porto Rico (Gundlach, U. S. N. M.). 



Megadytes gig aniens (Castelnau). Porto Rico (Gundlach and Van 

 Zwaluwenburg). The Cuban species may not be identical; it is labelled 

 I'herminieri in U. S. N. M. Coll. 



Eunectes occidentalis White is a synonym of E. sticticus (Linne); also 

 the citation on p. 398 of Eretes sticticus (Linne) for the Guadeloupe species is 

 an error, there being but one species involved. The author of E. occidentalis 

 appears to be Erichson. 



Thermonectes margineguttatus (Aube). Porto Rico (Gundlach). 



Thermonectes circumscriptus (Latreille). Porto Rico (Gundlach); St. 

 Thomas (U. S. N. M.). 



Rhantus calidus (Fabricius). Haiti (A. M. N. H.). 



Copelatus posticatus (Fabricius). Porto Rico (Gundlach); Haiti, St. 

 Vincent (U. S. N. M.). 



Copelatus angustatus Chevrolat. Porto Rico (Gundlach). 



* Celina grossula Leconte. Cuba (U. S. N. M.). 



Laccophilus americanus Aube (—proximus) Porto Rico (Gundlach). 



Pachydrus obniger (Chevrolat). Porto Rico (Gundlach). 



Family IV. GYRINIMl. 



Dineutes longimanus (Olivier). Porto Rico (Gundlach); Jamaica (U. S. 

 N. JVL). 



Dineutes metallicus Aube. Porto Rico (Gundlach) ; Guadeloupe (Fleu- 

 tiaux); Jamaica (U. S. N. M.). 



Gyrinus rugifer Regimbart. (?) Dominica (A. M. N. H.). 



Family V. HYDROPHILIDyE. 



Hydrochus pallipes Chevrolat. Porto Rico (Gundlach). 



* Hydrochus rugosus Mulsant. Cuba (A. M. N. H.). 



Derallus rudis Sharp. Cuba (A. M. N. H.). 



Stethoxus intermedins (Jacquelin Duval). Culebra (U. S. N. M.). 



According to Mr. F. Winters teiner, who has studied our collections of 

 Hydrophilidae, the West Indian species intermedins (Duval) is not identical 

 with the Central American species ater (Olivier). 



