128 MB. D. SHARP ON SOME 



finer and more distant. The individuals of both species vary 

 mucli in size, and the Ceylonese are usually mucli smaller than 

 the Japanese ; the largest of the former, however, attains the size 

 of the smallest of the latter. 



Balangoda, 15th March, 1882 ; three examples. 



Peoltctus. 



Prolyctus, Zimm. Trans. Am. Ent. Soc. 1869, p. 274. 

 Machlotes, Hoi'n (nee Pascoe), Proc. Am. Phil. Soc. xvii. p. 585. 



I do not think Prolyctus and Machlotes (the latter = Mrotyla- 

 thris, teste Eeitter) should be looked on as one genus, for though 

 the two are allied the differences are too numerous to justify 

 their union. Machlotes has the front tibise merely angulose at 

 the apex, not strongly spinose ; the tarsi much shorter than in 

 Prolyctus^ the basal joint being, in fact, not longer than the fol- 

 lowing ; the front coxae comparatively but little separated, the 

 first ventral segment much less elongate, and the thoracic sculp- 

 ture very extremely developed. 



I have some doubt whether I am following a correct course in 

 associating, as I have done, the JBothrideres hituberculatus, Eeitter, 

 with the North- American insect for which the genus Prolyctus 

 was founded ; for B. hituberculatus has the front, and more 

 particularly the middle, coxse less widely separated : but, looking 

 at the great general resemblance of the two forms, I am not 

 inclined to propose a new generic name for the Singhalese 

 insect at present; and it is clear that it is better placed in Pro- 

 lyctus than in Bothrideres, of which the European B. contractus 

 is the type. 



Pboltctus bitttbeeoulatfs. (Plate VI. fig. 9.) 

 Bothrideres hituberculatus, Reitt. Stett. ent. Zeit. xxxviii. p. 347. 

 Dikoya ; a series of twelve. 



Dastaecus poeosus. 



Dastarcus porosus, Walk. Ann, N. H. 1858,, p. 209. 

 In Dikoya and at Peradeniya ; three examples only. This 

 species inhabits also the Andaman Islands. 



Pycnomeeus alteenans. (Plate VI. fig. 7.) 

 Penthelispa alternans, Reitter, Stett. ent. Zeit. xxxviii. p. 349, 

 Bogawantalawa and Dikoya ; six specimens. 



