ALL0CHR0MA. 183 



robust ; the elytra are distinctly broader than the thorax, and for the 

 most part brightly coloured. Its transverse and rectilinear thorax, 

 together with the unarmed posterior tibia?, will also separate it from 

 those groups to which, from the form of the palpi, it is nearly allied. 



1. Allochroma humerale. 



A. ovale, robust ton, subdepression, nigrum; capite brevi, ad apicem 

 elongatulo, longitudinaliter carinato, punctato, ad basin penii 'us 

 granulato, rufo (inter oeulos nigro maculato) ; thorace transverso, 

 ad apicem U niter constricto, antice (ad latera) depresso, cequato, 

 punctato, rufo, maeula longitudinaliacl medium, alterisque apud 

 angulos anticos, nigris ; elytris robustis, punctato-striatis, jiavo- 

 pubescentibus, fusco-nigris, ad humeros rufo notatis ; antennis 

 rufis, art. 5—8 rufo-fuscis ; pedibus rufis, tibiis anterioribus 

 {tarsorv/mque apieibus) fuscis. 



Long. corp. 3^ lin., hit. 2 lin. 



Oblong, oval, slightly convex, robust, black. Head very short, 

 depressed, almost vertical, slightly elongate ; eyes large, but not pro- 

 minent, situated at the back of the head ; at the base of the antenna? 

 (immediately above their insertion) a short longitudinal fovea is 

 apparent ; below the insertion of the antenna? is a longitudinal ridge, 

 extending nearly to the mouth ; the surface is punctate, especially 

 at the base, where it is almost granulated ; the colour is rufous, with 

 a dark fuscous suffused spot between the eyes and close to the base. 

 Thorax transverse, slightly constricted towards the head ; the anterior 

 angles considerably depressed ; the sides submarginate ; surface 

 smooth and equate throughout, very thickly punctate, rufous, with a 

 dark fuscous medial longitudinal line (which is broad, and widening 

 towards the middle) extending from the head to the basal margin ; 

 the depression also of the anterior angles is of a dark fuscous colour. 

 Scutcllum triangular, impunctate, rufo-fuscous. Elytra somewhat 

 broader than the thorax, robust, short, punctate-striate, of a dark 

 fuscous coloixr, clothed throughout with a short flavous pubescence ; 

 from the base of the elytra (between the scutellum and the humeral 

 angle) is a broad longitudinal rufous band, diminishing gradually in 

 breadth and terminating medially at the fifth stria. Antenna* filiform, 

 short, rufous, with the fifth to the eighth joints rufo-fuscous. Legs 

 rufous, with the anterior tibia? (as well as the apex of the tarsi) 

 fuscous. 



A. humerale may be distinguished from its congeners by its greater 

 size, and more particularly by the short and thick Savons pubescence 

 on its elytra. 



From the district of the River Amazon. 



