492 On Aquatic Carnivorouti Coleoptera or iJytiscidtB. 



I. 44.— Genus IIYDROTRUPES. 

 Labial palpi very sliort and stout, their terminal joint subquadrate. 



()60. Hydrotrupes palpalis, n. sp.— Late ovalis, parum convexus, nitidus, subtus 

 ferrugineus, pectore nigricante, supra jenescens, capite antrorsum prothoracisque 

 lateribus ferrugineis, antennis crassiusculis pedibusque rufis ; capite thoraceque 

 reticulatis, hoc margine laterali crasso, elytris crebre sat subtiliter punctatis, punctis 

 seriatis fere nullis ; corpore subtus fere Ifevigato : tibiis anterioribus et intermediis 

 extus conspicue spinosis. Long 4§, lat. 2§ ni.m. 



T have seen only one individual of this peculiar insect, the appearance of which 

 suggests at the same time Hydrovatus and Agabus : the specimen is a male, and 

 though the front and middle tarsi cannot be said to be incrassate yet the three 

 basal joints bear beneath some glandular clothing. The numerous spines at the 

 sides and apex of the front and middle tibiae are conspicuously developed. The 

 very short and thick labial palpi, will readily allow the species to be identified. 

 The outline of the thorax and elytra is completely continuous. 



North Ameiica, (California; coll. Wehncke.) 931. 



L 4.5.— Genus METRONECTES. 



Coxal lines and coxal border very obsolete, almost absent ; antennae and palpi 

 short and stout ; hind coxa? but little developed, short, the anterior border but 

 little arched : %\nnofs of metasternum large. 



The unique species inhabits Corsica. 



661. Agabus aubei, Perris, Abeille, VII, p. 6. — Ovalis, minus convexus, nitidus, 

 niger, antennis palpis pedibusque rufis, femoribus piceis, supra obsolete reticulatus, 

 elytris punctis seriatis magnis ; prothorace cum elytris minus continuo, lateribus 

 leviter rotundatis, angulis posterioribus obtusis ; antennis brevibus, incrassatis. 

 Long. Q-7 , lat. 3§ m.m. 



The male distinctions are in this species extremely slight ; there is scarcely any 

 incrassation of the Iront and middle tarsi, and only the two basal joints are furnished 

 beneath with a small patch of short glandular hairs. 



The thickened antennae and pali)i of this species cause it to l)e very easily- 

 recognized. 



Coi-sica. 832. 



