410 Mr. D. Sluu-p's Contributions to the 



punctured, and with two large, well-defined impressions. 

 Thorax a good deal broader than long, rounded at the 

 sides, and a good deal narrowed behind, similar in colour 

 to the head ; the surface shining, rather sparingly but 

 quite distinctly ])unctured, with an excessively fine abbre- 

 viated impressed line on tlie middle. Elyti-a a good deal 

 longer than the thorax, sparingly and indistinctly punc- 

 tured, pale shining-yellow ; the suture infuscate, and the 

 pleura? piceous. Hind body pitchy, with the extremity 

 reddish ; the segments scarcely punctured, but finely 

 strigose at the sides and l)ase. Legs reddish-yellow. 

 Ega ; a single individual. 



ISOMALUS. 



This genus at present consists of about twenty-five 

 described species found in all the warm parts of the 

 world ; the genus Chasol/um, Cast., is apparently not 

 gufficiently distinct from Isomalus to be at present adopted 

 with advantage. The species are of the most difficult 

 character, in so far as their discrimination from one 

 another is concerned. I am not able to point out any 

 external characters to distinguish the sexes ; in certain 

 species some males have the head very large, but it seems 

 that this extra development in other individuals of the 

 same sex and species disappears entirely. 



1. Isomalus agilis, n. sp. Latiusculus, parallelus, 

 perdepressus, nitidus, fere lasvis, rufo-castaneus ; capite 

 oblongo; thorace lateribus antice rectis, postice rotundatis, 

 margine anteriore utrinque impresso ; elytris thorace paido 

 longioribus. Long. corp. 2^ lin. 



Antennfe slender, shorter than head and thorax, red, 

 scarcely thickened tow^ards the extremity; 10th joint 

 almost as long as broad; 11th elongate, fully twice as 

 long as 10th. Palpi red. Head as broad as thorax, 

 oblong, the sides quite parallel, shining red, almost im- 

 punctate. Thorax qiiite as long as broad; the sides in 

 fi-ont nearly straight, behind the middle rounded and 

 narrowed towards the base; the front margin on each 

 side bears a rather large impression, and at the hind 

 angle on each side are two indistinct depressions, one in 

 front of and external to the other. Elytra a little longer 

 than the thorax, red, very shining, a little infuscate at the 



