BY W; MACLEAY, ESQ., F.L.S. 339 



3rd. Thorax as broad as long 



A. brevis, Westw. 

 — . parallelocerus, Westw. 

 — . Westwoodii, MacLeay, W. 



— . Eockhamptonensis, n. sp. 



Section 2. — Antennce with the joints 2 to 9 less than three 

 times broader than the leno-th. 



A. Wilsoni, Westw. 

 — . Howittii, n. sp. 

 — . brevicollis, n. sp. 

 — . denudatus, Westw. 



A. polihis, n. sp. 

 — . latipennis, n. sp. 

 — . angusticornis, MacLeay, W. 

 — . Kingii, MacLeay, W. 



The first of these groups contains two distinct types. A. Mas- 

 tersii cylindricolUs and Watey'housei constitute one of them. They 

 are insects of large size, with the antenna3 moderately broad, the 

 thorax elongate and widest in the middle, and the elytra long and 

 truncate. The others are of the A. Macleayi type — antennce short 

 and broad, and thorax almost parallel-sided. 



The second group, of which A. Hopei Westw. — an insect placed 

 most unaccountably in Gremminger and Harold's Catalogue in the 

 genus Phymatopterus — may be taken as the type, has the antennas 

 broad, the thorax broadest in the middle, and the elytra more or 

 less covered with long hair. 



The third group is the most numerous in species, and the most 

 difficult of definition of the whole genus. The autennee are very 

 short and broad, the thorax is more or less quadrate, broadest in 

 front, and rounded and ciliated at the anterior angles, the tibi^ 

 are of great width, and the elytra are for the most part short, 

 with a corneous apex. In explanation of this last peculiarity, I 

 may state that all the Gerapteri have the extreme edge of the ter- 

 mination of the elytra thinned down as it were into a corneous 

 semitransparent substance, and in most species this corneous edge 

 is more or less emarginate and sinuate. In the present group 

 this is particularly the case. I have long had an idea that the 



