35 



tubercles on its elytra. A small conical and very conspicuous 

 tubercle stands just within and behind the humeral callus, and 

 there is another similar to it between it and the suture but 

 further from the base of the elytra. At the summit of the hind 

 declivity of each elytron is a transverse row of four or five 

 tubercles, which in the two females before me (one of which I 

 regard as the type of the species) are similar to the subl)asal 

 tubercles, but in the unique male (attributable I think to this 

 species) are much smaller. 



The disposition of the variegated pubescence is very intricate 

 and difficult to describe. It produces the following arrangement 

 of colors ; — the head is dark fuscous with the cheeks and a broad 

 stripe down the middle whitish ; the pronotum is of a more or 

 less pale brown with on either side of the middle line a large dark 

 brown subbasal blotch edged externally by some very pale 

 pubescence. The elytra in the two females are intricately mottled 

 with dark and pale brown, — the latter in one of them very pale, 

 in the other strongly ochraceous. In the male example the 

 external portions of the elytra are mottled as in the female while 

 the rest of their surface is almost entirely ochraceous. The 

 undersurface and legs are of ashy color thickly peppered with 

 small black spots. Joints 3 — 7 of the antennae are whitish 

 except near the apex (much more conspicuously in the male than 

 in the female), and the close and somewhat elongate hairs 

 fringing the antennae beneath are of the color of the pubescence 

 from which they spring. 



It is just possible that this insect is A. crossotoides, Thorns., 

 but the description under that name is too slight for confident 

 identification, and moreover (even sucH as it is) does not agree 

 with the present species. It describes the elytra as having four 

 fasciae of black pilosity and also some black tubercles. If these 

 four fasciae be taken as " two on each elytron" their number 

 would seem to suggest the idea of their referring to the series of 

 tubercles mentioned above as present in this insect, but in that 

 case their color does not agree, nor can I find any way of count- 

 ing the tubercles so as to make four transverse rows and some 

 tubercles besides. 



N.W. Australia. 



A. didyma, sp. nov, Nigricans, tomento griseo ochraceo et 

 nigricanti variegata, labro testaceo, antennis pedibusque 

 picescenfcibus ; capite prothoraceque dense subgranulose 

 punctulatis ; hoc ante medium transversim sulcato, utrinque 

 in dorso sat fortiter gibboso et ad latus tuberculo magno 

 acuto armato ; elytris inaequalibus (sc. puncturarum inter- 

 stitiis irregulariter elevatis, certo adspectu lineas varie 

 dispositas formantibus), basin versus cristas binas (altera 



