J837.] PHYTOPHAGOUS COLEOPfERA OF CEYLON. 95 



Thorax narrowly transverse, three times as broad as long. Scutellum 

 triangular. Elytra with a more or less distinct basal depression, 

 semipunctate-striate, their epipleurtB not continued below the middle ; 

 the four anterior tibise unarmed, the posterior ones with a small 

 spine ; the first joint of the posterior tarsi as long as the two 

 following ones together; claws appendiculate. Prosternum distinct; 

 the anterior coxa! cavities closed. 



Pexodorus will enter Chapuis's eighth group, the Oxygonince, on 

 account of the closed coxal cavities and the narrow transverse 

 thorax. From Oxygona the genus is distinguished by the short 

 ovate general shape of its body and the elytral epipleurse, which are 

 obsolete below the middle. 



Pexodorus ceylonensis, sp. nov, (Plate X. fig. 10.) 



Black or metallic green ; the basal joints of the antenna?, the 

 four anterior legs, and the posterior tibioe testaceous ; thorax 

 impunctate ; elytra finely and closely punctate-striate. 



$ (?). Elytra with deep basal depression ; antennae entirely 

 testaceous ; all the femora and the posterior tibiae black. 



Length l|-2 lines. 



Head rather broader than long ; the frontal elevations ovate, but 

 little raised and small ; eyes entire, of oblong shape ; clypeus rather 

 flat ; labrum obscure fulvous. Antennae two thirds the length of the 

 body, testaceous, the three or four apical joints fuscous. Thorax 

 rather more than three times as broad as long, the posterior margin 

 slightly rounded, the sides narrowly margined, nearly straight, the 

 anterior angles somewhat broad and slightly produced, furnished as 

 well as the posterior ones with a single hair ; the surface entirely 

 impunctate. Elytra widened towards the apices, with a shallow 

 basal depression ; the surface finely and very closely punctate-striate; 

 the posterior femora strongly incrassate, piceous, the others and the 

 tibiae and tarsi testaceous. Prosternum narrow ; mesosternura 

 much broader, its base slightly emarginate. 



Dikoya, 



I am not quite sure whether I rightly refer two specimens, which 

 differ from the others in the very deep elytral depressions and 

 diiferently coloured legs, to the female sex. lu the absence of other 

 distinguishing characters it is as well to regard them as such. Some 

 specimens are of a metallic greenish or bluish colour and the antennae 

 are entirely flavous; in others the colour of the latter is nearly black; 

 but I cannot discover any other differences of importance. 



Philogeus (gen. nov. Halticinorum). 



Ovate, convex, subcylindrical. Anterior coxal cavities open ; eyes 

 large ; palpi robust ; antennae with dilated apical joints. Thorax 

 transversely subquadrate, with a shallow transverse groove near the 

 base, the anterior angles oblique, notched before the middle. 

 Elytra finely punctate-striate, not depressed below the base. 

 Posterior femora strongly incrassate, their tibiae dilated at the apices, 

 with a shallow longitudinal groove, armed with a spine ; the first 



