400 REVISION OF THE AMYCTERIDBS, 



jeeting ends of the third interstices; with three isolated tubercles on each elytron, 

 situated posteriorly. 



Other characters as in H yhorrhynchtis. 



The S])('cies H. rufiosiis Macl., for which this genus is proposed differs so 

 widely from the other species included in Hyhorrhynchus, that I cannot regard 

 it as congeneric with them. The absence of tubercles on head and rostrum, the 

 position of the clypeal plate, the shape of the prothoras and the arrangement 

 of the few isolated elytral tubercles all form points of distinction. At the same 

 time it appears to be more nearly allied to Hyborrhynchus than to any other 

 genus, and the rugosities of the head correspond in position to the tubercles of 

 Hybnrrhyiicli us. 



Only the one species is so far known, and like most of the other species 

 of the group, this is found in the south-western corner of the continent. 



Neohyboerhynchus rugosus (Macl.) 



Hyborrhynchus rugosus, Macleay, Trans. Ent. Soc. N.S. Wales, i., 1865, p. 

 298. 



c?. Elongate, narrow. Black, densely clothed with brown depressed pubes- 

 cence; with lighter setae on head and jirothorax. 



Head with upper .surface convex and somewhat rugose, an ol)lic|ue ridge on 

 each side of median ridge convergent on base of rostrum ; a raised lidge on each 

 side above eyes. Rostrum separated from head above by a rather lightly im- 

 pressed sinuate line; upper surface concave, the concavity narrowed behind by 

 the approximation of the internal i-idges, the latter long and prominent; lateral 

 margins raised in a distinct, though not high, ridge, not tuberculate nor angulate, 

 separated from the internal ridges posteriorly by an elongate basal fovea. An- 

 tennae elongate, .slender; funicle with second joint longer than first; club 

 moderately long, not pedunculate. Eyes briefly ovate. 



Prothorax longer than broad, widest anteriorly and somewhat narrowed to 

 base; apical margin slightly produced above and with feeble ocular lobes; disc 

 with well-marked subapical constriction; median line impressed; set with rather 

 irregular, obscure granules. 



Elytra elongate, slightly widened posteriorly; base with rather strong for- 

 ward projections at ends of first and third interstices, width across outermost 

 e(|ual to width of base of prothorax; disc with punctures narrow, transversely 

 confluent, separated by transvei-se rugae, giving the derm a wrinkled appear- 

 ance; thir<l interstice raised and culminating in a large acute tubercle above 

 declivity; fifth witli two tubercles, sinallcr tlian the one on the first, and situated 

 anterior and posterior to it. 



Venter flat, with scattered light-coloured setae. Legs simple. 



9. Similar but larger and broader; elytral tubercles slightly smaller. Ven- 

 ter ('onvex. 



Dimensions: d'. 12 x 4 nun.; 9- 15 x 5.5 mm. 



TTab. — Western Australia: King George Sound. 



The clong.ate, .strongly transversely convex form, and the three isolated 

 tubercles above the declivity on each elytron render this species readily lecog- 

 iiisalilo. 



1* .\ R .\ II Y I! o i; 1! H V X C II U .s, n. g. 



Genotype — Acav tholophus convexiusenhis Macl. 

 Small, much broader across elytra than across i)rothorax. 

 Head separated from rostrum by a transverse sulcus; supraoi-bital crests 

 present, single, erect. Rostrum deeply excavate above, lateral margins tuber- 



