Longicornia Malayana. 31 



described below from Exocentrits, which, having a wide geo- 

 graphical range, may be expected to present a considerable 

 amount of variation. However, the narrower head, the more 

 slender antennae, with the greater length of the third and fourth 

 joints when compared with the scape, the absence of setse, and a 

 diflference of coloration, would seem, taken together, sufficiently- 

 distinctive characters, were it not that there are indications that 

 the most important of them, i.e. those of the antennas, may prove 

 to be too variable for generic use. Thus in S. melanolis, for in- 

 stance, the fourth joint is considerably shorter than the third, 

 while it is longer in S. mulatus, and about equal in S. svffusxis. 

 This shading away of characters is, unfortunately for the syste- 

 matist, more the rule than the exception in the Longicorn families. 



Sciades suffusus. 

 Leiopus suffusus, Pascoe, Trans. Ent. Soc, ser. 2, v. 37. 

 S. purpureo-fuscus, pube cinerea varius ; scutello triangulari ; 



antennarum articulis tertio quartoque sequalibus. 

 Hnb.— Aru. 



Dark purplish-brown ; head and prothorax covered with an 

 ashy pubescence, the spine small and placed rather behind the 

 middle; scutelliim equilaterally triangular; elytra varied with 

 blotches of greyish- ashy pubescence ; body beneath greyish ; 

 antennae and legs reddish-brown. 

 Length 2 lines. 



Sciades mulatus. 

 S. purpureo-fuscus, pube cinerea varius; scutello breviter ovato; 



antennarum articulis tertio quartoque aequalibus. 

 Hab. — Kxu. 



Closely resembles the last, but broader, the thoracic spine 

 placed much nearer the base, and the scutellum shortly ovate. 

 Length 2 lines. 



Sciades melanotis. (PI. H. fig. 2.) 

 S. purpureo-fuscus, pube grisea varius ; antennarum articulo 



tertio quarto longiore, scapo purpureo-fusco. 

 //a6. — Aru. 



Broader than the preceding, dull purplish-brown ; head with a 

 sparse greyish pile ; eyes subapproximate on the vertex ; pro- 

 thorax varied with patches (abrasions?) of a greyish pile, rather 

 convex, rounded at the side, the spine short and behind the middle; 

 scutellum subtransverse, rounded behind, except at the apex, 

 which is slightly pointed ; elytra with large patches of greyish 



