410 Ml". D. Sluu-p's Cuiitributions 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 punctured, with an excessively fine abbre- 

 viated impressed line on the middle. Elytra a good deal 

 longer than the thorax, sparingly and indistinctly punc- 

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

 pleurfB piceous. Hind body pitchy, with the extremity 

 reddish ; the segments scarcely punctured, but finely 

 strigose at the sides and base. Legs reddish-yellow. 

 Ega ; a single individual. 



ISOINIALUS. 



This genus at present consists of about twenty-five 

 described species found in all the warm parts of the 

 world ; the genus Chasolium, Cast., is apparently not 

 sutficicntly distinct h-om Isomalus to be at pi-esent 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 develojmient in other individuals of the 

 same sex and species disappears entii-ely. 



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

 perdepressus, nitidus, fere hevis, rufo-castancus ; capite 

 oblongo; thorace lateribus antice rcctis, postice rotundatis, 

 margine anteriore utrinque inq)resso ; elytris thorace paulo 

 longioribus. Long. corp. 2^ lin. 



Antennfc slender, shorter than head and thorax, red, 

 scarcely thickened towards the extremity ; 10th joint 

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

 long as loth. Palpi red. Head as broad as thorax, 

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

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

 fi-ont nearly sti-aight, liehind the middle rounded and 

 narrowed towards the base ; the front margin on each 

 side bears a rather large inq)ression, 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 



