216 Mr. J. 0. Westwood on a new Genus 



a slight prwut facie resemblance, in general contour, to the more 

 paraUel-sided Hadri (such as the H. alpinus and Paivce), — a circum- 

 stance which has suggested its trivial name. 



XVIII. — Descripiion and Figures of a new Genus and Species of 

 Gallerucida?. By J. 0. Westwood, Esq. 



Genus CnALCExrs. 



Corpus oblongo-ovale, subconvexiun, Iteve, uitidimi ; capite brevi, lato, 

 supra transverse ; facie verticali, magna ; protliorace transverse, capite 

 baud majore; elytris subovalibus. Caput transversum, breve, supra 

 parum convexum ; ocidis rotimdatis, angulos anticos laterales occupanti- 

 bus, vertice in medio in tubercuhim rotimdatum (in cujus parte antica 

 insident antennas basi approximatfe) paidlo elevatum. Fades magna, 

 quadrata, verticalis, infra ti-imcata ; clypco parvo, distincto, antice angus- 

 tato ; lahro parvo, antice rotundato, margine setoso. Mandibulte latse, 

 breves, extus rotimdatte, antice convexse ; maxillcB parvse, lobo apicali 

 tenui curvato, apice acuto ; palpi maxillares parvd, tenues, articulo l^o 

 brevissimo, 2^0 et 3tio longioribus ad apicem sensim incrassatis, 4to 

 miuuto aciiminato. lloition par\iun, breviter subcordatum, lateribus 

 rotundatis. Labium ejusdeni formte et paullo majus. Falpi lahiales 

 parvi, articulo basali minute, 2do majore sensim incrassato, S'io parvo 

 acuminate. Antennce fere corporis longitudine, in medio paullo cras- 

 siores, apicem versus attenuatse, articido l^o capite longiore, tenui, apice 

 clavato, 2do niinuto, S'i" longitudine dimidium articidi Imi excedente, 

 reliquis setosis et sensim longitudine decrescentibus, intermediis eras- 

 sioribus, apicalibus attenuatis, ultimo appendicula minuta conica ter- 

 minate. ProtJiorax brevis, transversus, capite paullo angustior, lateribus 

 et margine postico margine tenui elevate instructis. Scutelhon trian- 

 gulare. Flytra ovata, convexa, Isevia, tenue marginata. Prostermim 

 simplex. Pedes mediocres, femoribus satis robustis ; tihiis paidlo in- 

 curvis ; tarsis dilatatis, subtetrameris ; unguihus basi appendiculatis. 



Ohs. The description and di-awing of the pai'ts of the mouth are 

 not so complete as I could have wished, not having considered 

 myself at liberty to dissect the specimens lent to me by the au- 

 thorities of the Ley den Museum. 



Chaloenus latifrons. (PI. XII. fig. 1.) 



C. luteus ; antennis in medio, facie, mandibulis, tibiis tarsisque piceis ; 



elytris Isete pui-pureis ; corpore supra Isevi ; elytrorum lateribus serie 



marginali punctorum impressis. 

 Long, coi-p. lin. 3^. 

 Hab. Batang Singalang. In Mus. Lugdunensi. 



Facies in medio parum coueava, utrinque lineis duabus impressis 



