of Petalocerous Insects. 155 



Genns. Acanthurus. 



Nasus immarginatus, utrinque obtusangulus, apice rotundatus. 



AntenncB capite breviores, decemarticulatae : scapo brevi subtri- 

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

 quentihus tribus brevissimis pateriformibus ; sexto majori subturbi- 

 nato ; septimo brevissimo ; ultimis tribus capitulum majusculum 

 crassiusculum oblongum formantibus. 



Palpi articulo extimo elongato, lineari-laaceolato, tereti, apice 

 truncate, baud foveato. 



Prothorax longior quam in reliquis Trichiadis^ trapezoideus, 

 aatic^ disco bicarinatus : lateribus denticulatis. 



Coleoptra disco plano-concava, lateribus declivia, admodum 

 abbreviata. 



Abdomen segracnto penultimo toto et podice apertis, anus in 

 altero sexu stylo elongato instructus, sive podice styliformi. 



Corpus depressum, 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. 

 Ilorsfield's Javanese insects, is sufficiently distinguished from Tri- 

 chius, 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. Tuiciiius. 



Bigsbii. T. niger fulvescente-hirtus : elytris luteis ; niaculis 

 novem nigris. 



riate V. Fig. 7. 

 Long. Corp. Lin. 7. 



llubitat in CanadA prope Lacum St. Clair a D. Bigsby, M.D. 

 Icctus, cujus nomine merito condccoratur. 



Descr. Habitus fere T.fasciad, sed major & minus hirtus. 

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

 naso reflcxo, emarginato. Antenna: cum palpis luteie apice nigra?. 

 Prothorax trapezoideus, antice angustior, lateribus rotuiulatis : 

 postice repandus. Sciitcllum breve, apice rotundatum. Elytra 



