On Aquatic Carnworous Coleoptera or Dytiscide. 745 
I have seen only four individuals of this species ; three were in Castlenau’s collec- 
tion, labelled “Cybister javanus, Aubé, 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 large, being 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 epipleurze are somewhat flattened 
and oblique . 
The species is closely allied to the following one, but is really distinguished from 
it by the fine rugulosities 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, Trogus 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 segmentis 
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 
