406 Rev. H. Clark on the Dytiscidsc 



this species diifers 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. Gumming, from South Australia. 



5. H, Caledonice, n. sp. 



H. ovatua, convexus, punctatus, riifus, capite rufo-flavo ; thorace rufo, ad 

 basin transverse fusco ; elytris maculis transversis irregiilaribus, hac ad 

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



Long. corp. 2 liu., lat. 1^ liu. 



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

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

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

 fuscous: elytra broad, pimctate, rufo-fuacous, with two in'egidarly 

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

 on 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 antennee 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. Htdroporus, Clairv. 



A. Thorace haud striolato. 



1. ObLONGI : THORAX ANGULIS POSTICIS CUM ELYTRIS VIX ANGULUM 



FORMANS. 



1. H. Hoivittii, n. sp. 



H. latus, robustus, punctatus, rufo-ferrugineus, elytris rufis, fuaco-no- 

 tatis, vel fuscis flavo-lineatis. 



Long. Corp. 3 lin., lat. 1| lin. 



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

 minute depressions near the anterior margin ; smface 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 sm'face is thickly punctate, near the an- 

 terior margin is a row of minute pimctures ; in colour riifo-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 either side is an obsolete stria, which vanishes near 



