406 Rev. H. Clark on the Dytiscidoe 



this species differs by its greater breadth and less elongate form, as 

 well as by the absence of markings on the elytra. 



I have seen but two examples of this species, one from " Australia," 

 in the cabinet of the British Museum, and a second in my own collec- 

 tion, supplied to me by Mr. Cumming, from South Australia. 



5. H. Caledonia, n. sp. 



H. ovatus, convexus, punctatus, rufus, capite rufo-flavo ; thorace rafo, ad 

 basin transverse fusco ; elytris maculis transversis irregularibus, liac ad 

 medium, hac apicem juxta, nigris ; pedibus antennisque rufo-fuscis. 



Long. corp. 2 lin., lat. l£ lin. 



Ovate, convex, thickly punctate throughout, of a rufous colour : head 

 broad, rufo-navous, the base being narrowly fuscous : thorax broad, 

 very thickly punctate, in colour rufous, the basal margin being broadly 

 fuscous : elytra broad, punctate, rufo-fuscous, with two irregularly 

 formed markings, the one medial, the other near the apex ; but the two 

 ou either elytron are for the most part, apparently, not always united 

 together, but broadly separated at the suture from those on the other 

 elytron ; the form of these maculations varies in different examples ; in 

 one example they take the form of broad, almost unbroken, transverse 

 bands, in others of smaller isolated spots : legs and antenna rufo-fuscous. 



H. Caledonice is narrower somewhat, and more elongate, than other 

 species known to me of this continent. 



Two examples of this species are in the British Museum, from New 

 Caledonia. I have received the species from Mr. Cumming, from the 

 same locality. 



Genus 2. Hydroporus, Clairv. 



A. Thorace haud striolato. 



1, OBLONGI : THORAX ANGULIS POSTICIS CUM ELYTRIS VIX ANGULUM 

 FORMANS. 



1. H. Howittii, n. sp. 



H. latus, robustus, punctatus, rufo-ferrugineus, elytris runs, fusco-no- 

 tatis, vel fuscis fiavo-lineatis. 



Long. corp. 3 lin., lat. 1^ lin. 



Ovate, broad, robust, punctate, rufo-ferruginous : head with two 

 minute depressions near the anterior margin ; surface almost imper- 

 ceptibly punctate : thorax transverse, the anterior margin emarginate, 

 the sides constricted in front so as to form a continuous line with those 

 of the elytra and head ; the surface is thickly punctate, near the an- 

 terior margin is a row of minute punctures ; in colour rufo-ferruginous, 

 the base being more or less broadly marked with fuscous : elytra 

 robust, thickly punctate, and at the sides pubescent ; at some distance 

 from the suture on cither side is an obsolete strin, which vanishes near 





