RHINOTMETUS. 45 



surface near the scutellum ; colour dark bright blue. Antennae ro- 

 bust, filiform, black. Legs black, the femora being dark fuscous. 



The colour of the head and thorax of this insect is evidently sub- 

 ject to slight variation ; occasionally it is, instead of dark fuscous, a 

 perfect black. 



Distinguished at once by its much smaller size from all its con- 

 geners with which I am acquainted. 



Brazil ; the Island of S. Paulo. In the collections of M. Deyrolle 

 and Mr. "Waterhouse. 



10. Rhinotmetus ruficollis. 



R. oblongo-ovatus, robustus, antice attenuatus, punctato-striatus, 

 niger; capite transverse, producto, antice carinato, super basin 

 antennarum transverse foveolato, ad basin rugoso, rufo ; thorace 

 elongato, antice subattenuato , ad basin depresso, impunctato, 

 glabro; elytris sat latis, punctato-striatis, purpureo-nigris ; an- 

 tennis robustis, filiformibus, piceis ; pedibu$ robustis, piceis, 

 femoribus posticis fusco suffusis. 



Long. corp. 3^ lin., lat, 1^ lin. 



Oblong-ovate, robust, subcylindrical, attenuated in front, impu- 

 bescent, punctate-striate, black. Head transverse, produced in front ; 

 from the margins of the labrum two carinations extend obliquely 

 towards the base of the antennae, while between them an acute lon- 

 gitudinal ridge is produced upwards between the insertion of the 

 two basal joints, less prominent above the base, and terminating in 

 a transverse fovea, which connects the upper and inner margins of 

 the eyes (sometimes the upper portion of this medial ridge is ob- 

 solete) ; eyes tolerably large and prominent, situated at some di- 

 stance from the base of the head ; the surface at the base rugose, and 

 the colour throughout darkly rufous. Thorax elongate, subattenu- 

 ated and rounded in front ; the anterior angles obsolete and much 

 depressed; the sides parallel at the base and marginate; at the 

 base is a broad transverse depression (sometimes represented by 

 two subcircular depressions, one on either side of the medial line) ; 

 the surface impunctate, rufo-glabrous. Scutellum triangular, im- 

 punctate, and rufo-fuscous. Elytra considerably broader than the 

 thorax, robust, ovate, deeply punctate-striate, impubescent, black 

 (sometimes shaded with a purple hue). Antennae robust, filiform, 

 piceous. Legs robust, piceous, the posterior femora being suifused 

 with fuscous. 



Brazil (the neighbourhood of Rio Janeiro). 



This species may be at once recognized among its congeners by its 

 rufous prothorax, darkly cyaneous elytra, and piceous legs. 



