On Aquatic Carnivorous Coleoptera or Dytiscide. 689 
broadly yellow. The elytra have some large isolated yellow spots—five or sIx on 
each wing-case—viz., a large spot near the scutellum, a large humeral mark, two 
rather large spots placed transversely just behind the middle, a transverse oblique 
subapical mark, and a small one at the extremity ; the yellow colour on the outer 
margin extends from the base to very near the apex, so that all the outer yellow 
marks, except the small apical one, are connected together by this band of yellow 
colour. The posterior legs are very short and stout. 
This form is similar to 8. guttatus, but is much shorter and broader, and has the 
black colour of the upper surface less predominant. I have seen only one indivi- 
dual—a female. 
Celebes. 985. 
1080. Sandracottus ornatus, n. sp.—Latiusculus, sat convexus, nitidus, niger, 
supra testaceo-variegatus, antennis pedibusque anterioribus testaceis, femoribus 
posterioribus picescentibus ; capite thoraceque testaceis, illo vertice signaturisque 
duabus in medio nigris, hoc anterius et posterius nigro, elytris nigris, maculis 
conspicuis margineque externo testaceis. Long. 13, lat. 8 m.m. 
Tn this species the head is yellow, with the vertex and two isolated marks on the 
middle placed at an angle to one another, black; the thorax is yellow but has a 
black band in front, and a still larger basal one black, these two bands are scarcely 
connected together on the middle. On each wing-case there is a large humeral 
mark and two small basal spots yellow, the humeral mark surrounds a longitudinal 
black mark nearly or quite dividing the humeral mark into two isolated parts, just 
behind the middle are two rather large yellow marks, placed transversely so that 
with those on the other wing case an interrupted band is formed; there is also an 
oblique subapical yellow mark, and a minute apical spot: all the external of 
these yellow marks, except the minute apical spot, are connected together by an 
extension of the humeral mark along the lateral margin; the minute apical spot 
indeed is but little separated from this yellow band. 
The species seems to be closely allied both to Hydaticus insignis, Wehncke (No. 
1076), and S. rotundus, it differs from the former by its rather broader form, and 
by the black colour covering a much larger portion of the wing-cases so that the 
yellow marks are much reduced in size: it is scarcely so short and broad as S. 
rotundus and has the black colour less predominant on the head and thorax, but 
more predominant on the wing-cases ; there being two small yellow marks on each 
near the scutellum instead of one large one as in S. rotundus, while the humeral 
mark is divided by a black longitudinal mark. I have seen two femaies of the 
species. 
Borneo. 986. 
