of Petulocerous Insects, 153 



Genns. Acanthurus. 



Nasus immarginatus, utrinque obtusangulus, apice rotundatus, 



Jntenn(B capite breviores, decemarticulatae : scapo brevi subtri- 

 gono hirto ; pedicello brevissimo ; articulo tertio turbinate, se- 

 quentibus tribus breTissimis pateriformibus ; sexto majori subturbi- 

 nato ; septirao brevissimo ; ultimis tribus capitulum majusculum 

 crassiusculum oblongum formantibus. 



Palpi articuld extimo elongato, lineari-lanceolato, tereti, apice 

 truncato, baud foveato. 



Prothorax longior quam in reliquis Trichiadis^ trapezoideus, 

 antice disco bicarinatus : lateribus denticulatis. 



Coleoptra disco plano-concavaj lateribus declivia, admodum 

 abbreviata. 



Abdomen segraento penultimo toto et podice apertis, anus in 

 altero sexu stylo elongato instructus, sive podice styliformi. 



Corpus depressura, supra reticulato-acuductum, subtus squamu- 

 lis canaliculatis tectum. 



Type of the genus Trichius hemipterus F. 



This genus, of which I have seen a second species amongst Dr. 

 Horsfield's Javanese insects, is sufficiently distinguished from Tri' 

 chiusy not only by its depressed form, but also by its long trape- 

 zoidal prothorax, its short elytra, many-toothed cubitus, and the 

 mucro that arms the anus of the male. 



Genus. Trichius. 



Bigsbii, T. niger fulvescente-hirtus : elytris luteis ; maculis 

 noyem nigris. 



Plate V. Fig. 7. 

 Long. Corp. Lin. 7. 



Habitat in Canada prope Lacum St. Clair a D. Bigsby, M.D. 

 lectus, cujus nomine merito condecoratur. 



Descr. Habitus fere T.fasciati^ sed major & minus hirtus. 

 Corpus ovatum, nigrum, fulvescente-hirtura. Caput quadratum : 

 naso reflexo, emarginato. Antennce cum pal pis luteae apice nigrae. 

 Prothorax trapezoideus, antice angustior, lateribus rotundatis : 

 |)ostice repandus. Scutellum breve, apice rotundatum. Elytra 



