OF NEW ZEALAND. 71 



Group HYDROPORnXE. 



Antenna eleven-jointed, inserted immediately in front of, and a little 

 below, the eyes. Scutellum frequently indistinct. The three first joints 

 of the four front tarsi nearly equally dilated in both sexes and sponge- 

 like underneath; their third joint bi-lobed, fourth very small, nodiform, 

 hidden between the lobes of its predecessor ; posterior tarsi five-jointed, 

 rarely with four ; coxa of the same pair of normal form. Prosternum 

 in general straight. 



Hydroporus. 



Clairv. ; Lacord. Hist, des Ins. Coleop., Tom. i., p. 415. 



Mentum trilobed, the middle lobe very small and acute. Last 

 joint of the /^/longer than the preceding one, fusiform ; that of the 

 labial truncated at the end and slightly arched. Labrum sloping, some- 

 times feebly, sometimes strongly, emarginated, ciliated. Head wide, 

 sometimes margined. Antenna setaceous, their two first joints longer 

 than the others, the third and fourth often shorter. Prothorax, in 

 general, lobed at the middle of its base. Scutellum invisible. Elytra 

 variable in form. Legs slender, the three first joints of the four anterior 

 tarsi not at all, or very slightly, longer than broad, the last free ; posterior 

 tarsi filiform, their claws equal, and mobile. Prosternum narrow, fre- 

 quently widened, spatuliform, and plain behind. 



Body of variable form, sometimes oval and a little convex, some- 

 times short and more or less thickened, often pubescent. 



136. H. wakefieldi, Sharp ; Entom. Mon. Mag., June, 1876, 

 p. 20. Fuscus, sub-opacus, pedibus testaceis, thoracis lateribus, ely- 

 trisque flavosignatis, crebre punctatus ; thoracis lateribus minus curvatis, 

 antrorsum leviter angustatis. 



Long. Corp., 4j mm. 



Mas. Femoribus posterioribus apicem versus triangulariter dilatatis. 



Head closely and rather finely punctured, blackish, with the clypeus 

 reddish at the front margin. Antenna yellow, joints 5-10 infuscate, 

 with their bases pale. Thorax blackish, with the sides broadly 

 yellow, the hind angles are nearly rectangular, and the sides are but 

 little curved, and distinctly narrowed towards the front, the anterior 

 angles being greatly produced, the surface is finely, closely, and evenly 

 punctured, the punctation becoming more indistinct towards the sides. 

 Elytra blackish, with yellow marks, very variable in extent, they are 

 nearly dull, and are evenly and finely but distinctly punctured, and on 

 the middle of each is a series of larger punctures, they are regularly 

 curved towards the apex. Legs yellow, with the hind tarsi more or less 

 infuscate, the hind tibiae also sometimes darker. The under surface is 

 fuscous, closely and evenly punctured. The prosternal process is 

 elongate, and much compressed laterally; the fourth joint of the front tarsi 

 is quite visible between the lobes of the third joint. 



