0?? Aquatic Carnivorous Coleoptera or Dytiscidce. 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 S. 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, raaculis 

 conspicuis margineque externo testaceis. Long. 13, lat. 8 m.m. 



In 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. 

 1070), 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 females of the 

 species. 



Borneo. 986. 



