128 Mr. II. W. Bates on the Longicorn 



Hybolasius, nov. gen. 



Gen. Hebeseci affine. Corpus oblongum, tomentosum. Caput re- 

 tracturn, fronte quadratum. Antenna; corpore paulo longiores, 

 ciliatae ; scapo quam articulo tertio multo breviore, brevitcr cla- 

 vato ; articulis tertio et quarto caeteris singulis multo longioribus, 

 hoc paulo curvato. Thorax lateribus tuberculatis. Elytra apiee 

 rotundata, basi utrinque cristata. Pedes robusti ; femora clavata ; 

 tibiae gradatim dilatatae, intermediis vix emarginatis. 



This genus is founded on a common New-Zealand insect, 

 the Lamia crista of Fabricius, which White placed in the 

 genus Pogonocherus. It agrees with Pogonocherus in many 

 essential characters — such as the structure of the sterna, the 

 form of the sockets of the anterior and middle coxas, and the 

 divaricate claws ; but the antennas resemble much more nearly 

 those of Hebesecis and the allied genera, differing chiefly in 

 the shorter and more regularly clavate scape. There is, how- 

 ever, scarcely any difference in the formula? given by Lacordaire 

 of the two groups Hebesecides and Pogo?iocherides, although he 

 places them so widely apart. The genus is also closely allied 

 to the Chilian (Ectropsis, placed by Lacordaire in the Exo- 

 ceni 'rides group. 



Hybolasius crista. 



Lamia crista, Fab. Syst. En torn. p. 170. 



Fabricius describes the basal tubercles of the elytra as tri- 

 dentate ; but, as I have satisfied myself by examination of 

 his type specimen in the Banksian collection, they are not 

 toothed at all, but surmounted by a compressed pencil of hairs. 

 This type is a large form of the species (3f lines), of tawny 

 brown colour, with the narrow black posterior fascia unaccom- 

 panied by a broader dark belt. Most of the examples I have 

 seen (from Auckland) are smaller, about 3 lines, with much 

 darker brown elytra, having the shoulders and an apical spot 

 tawny, and a broad posterior blackish fascia, the anterior 

 margin of which is black, margined again anteriorly with 

 light tawny. But all connecting gradations occur, and I 

 believe they form only one variable species. It may be 

 known from its congeners by the elevated penicillated crests, 

 the robust acute lateral thoracic tubercles, and the finely striated 

 integument of the thorax. 



"&' 



Hybolasius viridescens, n. sp. 



H. subdepressus, hirsutus, fuscus ; elytris herbaceo-viridibus, medio 

 dorsi fulvescentibus, strigaque obliqua nigra ; thoracis tuberculis 

 latoralibus magnis obtusis, dorso hand striato, medio trituberculato ; 



