Annulosa Javanica. 201 



the genus Omophro?i, but are also less variable iu form, the tropical 

 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 Gi/tinidce 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 short and the antennae setaceous. Three species of 

 Gi/rinidce, one of which forms the new genus Dmeutus, are found 

 in the collection ; together with eight species of Dytiscidce. 



The Philhydridiiy between which and the preceding stirps an 

 interesting link is supplied by Spercheus, is divided into the 

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

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

 in length to the antenna?, Helophoridie ^ Hydrophilidfe, and 

 Sphcerididw ? 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 Sjfhcerididce. 

 It will have been remarked that among the aquatic Coleoptera, 

 only one new form has occurred in the collection. 



To the normal ? group of Nec?'ophaga, in which the club of the 

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

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

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

 dulidce^ Engidce^ and Dermestidee. The connection of this with 

 the former stirps *is found between the last named family and 

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

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

 and one of the Nitidulidce. 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 Colydium^ from 

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

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

 Dermesles vulpinusy is remarkable for its ubiquity, and the other 



