On Aquatic Carnivorous Coleoptera or Dytiscidce. 745 



I hgive seen only four individuals of this species ; three were in Castlenau's collec- 

 tion, labelled "Cybister javauus, Aube, Java;" the fourth specimen is in M. de 

 Bonvouloir's collection, labelled "Javanus'" but without locality. The specimens 

 were all in very bad condition, and all four evidently from one source. 



Java. {]) 1096. 



1166. Cybister celebensis, n. sp. — Ovalis, supra olivaceo-niger, capite anterius 

 prothoraceque ad latera testaceis, elytris vitta intramarginali, versus apicem hamato- 

 dilatata, testacea ; subtus niger, pectore utrinque late testaceo, abdomine segmen- 

 tis 3-.5 ad latera testaceo-maculatis ; pedibus quatuor anterioribus testaceis, tarsis 

 intermediis piceis ; pedibus posterioribus nigricantibus, femoribus ad apicem late 

 rufis; elytris versus apicem subtiliter sed perspicue coriaceo-rugulosis. Long. 29, 

 lat. 16 m.m. 



The male front tarsi are rather laro-e, beings about 3 m.m. in the transverse 

 direction ; the intermediate feet have a large patch of short sexual pubescence on 

 each of the two basal joints. The female has a highly developed sexual sculpture, 

 the thorax being nearly covered with irregular rather fine scratches, and the elytra 

 bear elongate scratches which extend about four-fifths of the length, but leave the 

 sutural portion smooth except at the base ; the epipleurse are somewhat flattened 

 and oblique 



The species is closely allied to the following one, but is really distinguished from 

 it by the fine I'ugulosities on the elytra. From C. crassus and allies the greater 

 extent of dark colour on the undersurface readily distinguish it. I have seen only 

 a pair of the species. 



Celebes, (A. R. Wallace). 1097 



1167. Cybister rugosus, Macleay, Tragus ruyosus, M.C. — Ovalis, parum latus, 

 nigricans, capite anterius prothoraceque ad latera testaceis, elytris vitta intramar- 

 ginali, versus apicem hamata, testacea, pectore utrinque pallido, abdomine segmeutis 

 3-5 ad latera testaceo-maculatis; pedibus quatuor anterioribus testaceis, tarsis 

 intermediis piceis ; femoribus posterioribus ad apicem rufis ; elytris versus apicem 

 profunde coriaceo-rugulosis. Long. 29, lat. 16 m.m. 



The male front tarsi are rather large, attaining 3 m.m. in the transverse direction ; 

 the intermediate feet have a large patch of short sexual pubescence on each of the 

 two basal joints. The female characters are very variable : usually that sex has a 

 highly developed sexual sculpture, the thorax being covered with irregular 

 scratches and the elytra bearing coarse, elongate ones, which extend four-fifths of 

 the way to the apex, but leave the suture bear except at the base ; in certain speci- 

 mens the elytra are entirely covered with scratches except on a minute space at the 



