Annulosa Juvmiica. ^61 



the genus Omophron, but are also less variable in form, the tropica! 

 species being usually referable to the same genera as the Euro- 

 pean. It has therefore been impracticable in the present state of 

 entomological knowledge to exhibit clearly among them more 

 than the two families of Gyrinidce and Dytiscidce ; the former 

 appertaining to the normal group, with long anterior legs and 

 short antennae, and the latter to the aberrant, in which the ante- 

 rior legs are sho>t and the antennae setaceous. Three species of 

 Gyrinidce^ one of which forms the new genus Dineutus^ are found 

 in the Collection ; together with eight species of Dytiscidce^ 



The Philhydrida, between which and the preceding stirps an 

 interesting link is supplied by Spercheus, is divided into the 

 following families : normal ? with the palpi shorter than the an- 

 tennae, Heteroceridce ? y Parnidce : aberrant? palpi at least equal 

 in length to the antennae, Helophoridw^ Hydrophilldce^ and 

 Sphcerididce ? Of the first and third of these families Dr. Hors- 

 field has brought no specimen from Java; and of the second, 

 only one species, which is however valuable as an addition to the 

 single example previously'' known of the subgenus Dryops. Of 

 Hydrophilidce five species are described, all of which coincide 

 with well known genera ; as do also the two species of Sphcerididce, 

 It will have been remarked that among the aquatic Coleoptera, 

 only one new form has occurred in the collection. 



To the normal ? group of Necrophaga, in which the club of the 

 antennae is elongated, being 'composed of four or five joints, are 

 assigned the Scaphididce and Silphidce ; and to the aberrant?, with 

 the club short and formed only of two or three joints ?, the Niti' 

 dulidcE^ Engidce^ and Dermestidce. The connection of this with 

 the former stirps is found between the last named family and 

 the Sphcerididce. Of the Scaphididw no example is found in Dr. 

 Horsfield's collection, and there occurs only one of the Silphidce^ 

 and one of the Niiidulidce, In Engidce it is much richer, com- 

 prising fifteen species, and including two new forms, as well as 

 specimens of two established groups, Engis and Colydiuniy from 

 which it has been found necessary to detach other genera. Of 

 the Dermestidce only two species are noticed, one of which, the 

 Dermestes vulpinus^ is remarkable for its ubiquity, and the other 



