Species of New- Zealand Cohoptera. 389 



prominent and has two short elevations, at the base two 

 distinct oblique costaa enclose a triangular depression ; it is 

 finely but distinctly granulate. Elytra quite as broad as 

 thorax at the base, the sides and apex nearly vertical ; the 

 suture slightly raised behind ; on each elytron there is a 

 distinct granular costa, which is curved outwards near the 

 base and becomes nodiform on the summit of the posterior 

 dtclivity, between it and the suture there are two series of 

 granules or punctures when examined in different lights ; 

 the external sculpture, though similar, is less definite. 



Antenme 1 1-articulate ; second joint obconical, stout, quite 

 as long as exj)osed part of the basal one, third longer than 

 fourth, joints 5-8 bead-like, ninth distinctly broader than 

 eiuhth and about half the breadth of the strongly transverse 

 tenth, the terminal subrotuudate. 



This can be distinguished from Heterargus nidis and the 

 species of Gat/ioc/es by the distinct oblique elevations near 

 the base of the thorax, 



A variety occurs in which the sculpture is less definite. 

 One antenna has only nine joints, the basal and terminal 

 three are normal, as is the club ; the missing intermediate 

 ones are atrophied and coalesce so as to form one joint 

 almost as thick as the second and about one-third as long as 

 the whole length of the antenna. 



Length 1^ ; breadth ^ line. 



Otara, Southland {Mr. A. Philpott). 



Obs. — The genera Heterargus and Gathocles, described 

 almost simultaneously at opposite sides of the earth, the 

 former by Dr. Sharp, the latter by myself, are, I think, 

 synonymous ; but as Dr. Sharp did not state whether the 

 antennae are 10- or 11-jointed, some uncertainty still exists. 



Prutarphius tricavus, sp. n. 



Body pale rufo-castaneous, obscured by sappy matter; 

 antennae and tarsi red. 



Head with granular sculpture, the lateral prominences 

 cover half of the basal joint of the antennae. Thorax broader 

 than long, the disk transversely convex and uneven, with two 

 broad irregular ridges which are less elevated in front than 

 near the middle; the intervening spaces assume the form of 

 an elongate frontal and two foveiform basal impressions, 

 near the sides there are a few minute granules ; the lateral 

 margins are thick, not much expanded and but little rounded, 

 with obtuse angles. Elytra rather short, broader than 

 thorax, transversely convex, the apex and sides vertical ; on 



