HydrophiUdcs of Netv Zealand., 475 



Hydkostygnus, n. g. 



Corpus ovale, convexuni ; labrum porrectum, emarginatum, 

 palpi maxillares crassiusculi, parum elongati, articulo pseudo- 

 basali sat elongato, sequente longiore, hoc quam ultimo paulo 

 longiore ; mentum baud latum, longitudine vix latius ; antennae 

 9-articulatae, articulis intermediis omnino discretis ; pedes inter- 

 mediae plus minusve distantes, metasternum inter eas productum, 

 cum mesosterni processu conjunctum ; tibiis crassis, mucronibus 

 elongatis praesertim anteriorum, femoribus posterioribus subtus 

 punctatis, sed vix perspicue pubescentibus, tarsis omnibus subtus 

 densius pubescentibus, posteriorum articulo basali brevi quam 

 secundo triplo breviore ; corpore subtus omnium densissime sub- 

 tilissime pubescente. 



This is another peculiar genus ; it bears a great 

 resemblance in appearance to Cyclonotum, but belongs 

 rather to the Hydrohiini in the neighbourhood of Saphy- 

 drus and Rygmudus ; the large exposed labrum, the thick 

 legs, and the tarsi hairy beneath, are characters which, 

 taken conjointly, distinguish this from all the other New 

 Zealand forms of HydropJiilidcs. The two species known 

 to me, though similar in general appearance, differ in 

 some important structural characters, which will be 

 alluded to in the specific descriptions ; at present there 

 would be no advantage in treating them as distinct 

 genera. 



Hydrostygnus hrouni, n. s. 



Ovalis, baud latus, convexus, nitidus, nigro-piceus, marginibus 

 piceis, antennis palpisque testaceis, pedibus piceis tarsis rufescenti- 

 bus ; corpore supra crebre sat fortiter punctato elytrisque prseterea 

 seriebus decern conspicuis punctorum majorum. Long. 5| mm., 

 lat. 3 mm. 



The epistome is broadly emarginate behind the large labrum ; 

 the eyes not prominent, indistinctly facetted. The punctuation of 

 the head and thorax is rather close and distinct, that of the elytra 

 is more scanty, and becomes obsolete towards the apex, the serial 

 punctures are rather large, deep, and approximate, and that next 

 the suture is behind deepened into a definite stria. The basal joint 

 of the antennae is as long as the three following together, but 

 shorter than the club ; the mesosternal portion of the pectoral 

 prominence is very short, and has the form of a crescent attached 

 to the front of the middle of the metasternum, the middle legs 

 being widely separated ; the prominent middle of the metasternum 

 is coarsely punctate, the tibise are only moderately stout, and the 

 hind tarsus is moderately laxly articulated. 



