BY W. MACLEAY, ESQ., F.L.S. 337 



others. The antennge have the first joint thicker, but not longer 

 than the rest ; the second shorter, and from the fourth they 

 become evidently more attenuated. The labium is wanting, but 

 the edge of the epistome is deeply emarginate. The head above 

 is nearly square, flat on the vertex, and hollowed out in front, 

 with a lateral carination, which is curved behind so as to form 

 the posterior angles ; beneath it is concave and canaliculate in the 

 middle, while near each side there is a strong rugose ridge which 

 terminates suddenly near the base. 



The form of the thorax is also very unusual, it is flat, broadest 

 in front, but scarcely so broad as the head, narrowed rapidly to 

 the base and subtrnncate in front and behind, with a lateral re- 

 curved margin broadest at the posterior angles. The elytra are 

 of an almost perfectly oval form. The legs ai^e not strong for 

 the size of the insect ; indeed, the tibite are slight and without 

 external teeth, the tarsi ai'e also rather slight, the first joint is 

 long, the rest get gradually shorter. 



I can scarcely venture to give an opinion as to the position of 

 this remarkable insect among the Garahidce. 



It would appear quite as much out of place among the 

 Cnemacanthidce or Stomidce as Diodes, and I cannot see any 

 affinity in either genus to Aclnopus. 



On the other hand, there is, judging by description, for I have 

 never seen the genus myself, a marked approach in the anatomy 

 of the mentum labium, &c., to Lwperca of Castelnau. 



All the Paassidfe of Australia belong to the genus Gerapierus 

 of Swederus, a name applied to those of the family which have 

 ten joints to the antenna?. 



The genus has since been largely subdivided, and two of the 

 subgenera Arthropterus MacLeay and Phymatopterus Westwood 

 are peculiar to this country. Of the first of these there are many 

 species though all extremely rare. A. Macleayi Don. the original 

 species, long remained the sole representative of the group, to 

 this Professor Westwood added about twenty years ago the 

 species hrevis, denudatus, parallelocerus, subsulcatus, and Wilsoni, 



