255 



impression that yorkensis was distinct on account of the club 

 and the base of the prothorax. The antennae, however, are 

 very different sexually; in the male the lamellae of the club 

 are much longer than in the female, although in that sex they 

 are so long that a unique specimen would probably be 

 regarded as a male. On some specimens the convexity of the 

 prothorax is more pronounced than on others, but the differ- 

 ence is certainly less striking than is implied in the table, 

 and its apparent convexity is subject to alteration by the 

 closeness of its application to the elytra. Of yorkensis there 

 are in the Museum a cotype male and the type female ; of 

 planicollis there are two cotype females and a named male 

 (but not marked as a cotype), and, sex for sex, these agree 

 well in structure. There are also numerous other specimens 

 before me, and the species may be taken in abundance at 

 lights in Northern Queensland. The head and prothorax are 

 frequently more or less reddish-castaneous, but vary (in both 

 sexes) almost to black, occasionally they are scarcely darker 

 than the elytra ; pale females in colour are scarcely dis- 

 tinguishable from some forms of Haplonycha testaceipennis, 

 but may be at once distinguished by the base of the prothorax 

 being almost simple, instead of narrowly but conspicuously 

 upcurvec} as on that species. 



Neso ducalis, Blackb. 

 The carinae on the pygidium of this species is sometimes 

 very conspicuous, but varies so that on some specimens it is 

 not traceable. The male differs from the female in being 

 more parallel-sided, and with the lamellae of the club almost 

 twice as long. The size varies from 12 to 16 mm. 



Anodontonyx vigilans, Sharp. 

 A. creber, Blackb. 

 A. chalceus, Blackb. 

 A. indignus, Blackb. 



Two specimens, one without label, the other ( 4 ) labelled 

 "Austral.," in Dr. Sharp's writing, were sent by Mr. Arrow 

 as A. vigilans, a species comented upon by the late Rev. T. 

 Blackburn as incapable of determination^) but as nearest in 

 description to chalceus. They, in fact, agree well with three 

 specimens from his collection labelled as chalceus, and their 

 iridescence is quite as pronounced as on those specimens. 

 They agree also with two named specimens of indignus, a 

 cotype, and some other named specimens of creber. 



(4) Almost certainly one of the specimens mentioned by Sharp. 



(5) Ante, 1907, p. 260. 



