730 On Aquatic Carnivorous Coleoptera or Dytiscide. 
differ in any definite manner from the East Asiatic form : the female has no sexual 
sculpture. 
A pair from the Andaman Islands agree tolerably with individuals from Sumatra, 
but are perhaps of still shorter form, and the male is very small, the dimensions 
being 24 by 13 by 72 m.m. 
From Hindostan I have seen but two or three individuals, they agree with the 
East Asiatic form; the female has no sexual sculpture. 
The specimens from Bourbon and Mauritius are of short, robust and convex 
form, and the females have usually a fine sexual sculpture which occasionally is 
nearly or quite absent; I cannot distinguish the specimens from these insular 
localities from some of the Javanese specimens. 
The specimens from Madagascar although extremely similar at first sight can 
nevertheless be always distinguished with certainty, and are therefore con- 
sidered by me asa distinct species: but I believe connecting specimens will 
ultimately be found. 
The species is very abundant in Africa and is there usually of elongate form, 
with the lateral band on the elytra broad; the form, however, varies a good deal, 
the most elongate specimen before me is 31 m.m. long, by 153 by 9, while one of 
the shortest measures 27 m.m. by 142, by 83; the females never show any sexual 
sculpture, and the tarsi of the male do not differ in any appreciable manner from 
what obtains in the Australian individuals ; indeed many Australian individuals are 
quite indistinguishable from African ones, yet in Africa the females never have 
sexual sculpture while in Australia they nearly always possess such. The most 
elongate and peculiar of the African specimens are found in South Africa. 
The specimens found in the South of Europe quite agree with the African in- 
dividuals. 
The Nubian Trogus haagi, Wehncke, and the Caucasian C. gotschi, Hoch., are 
both pretty certainly to be referred to this species. 
1141. Cybister cinctus, n. sp.—Ovalis, convexus, supra olivaceo-niger, epistoma 
totum prothoraceque lateribus late testaceis, elytris margine externo (cum epipleuris) 
argute et late testaceis, subtus piceus, metathoracis episternis abdominisque lateribus 
testaceo-maculatis ; pedibus quatuor anterioribus testaceis, femoribus anterioribus 
fusco-maculatis, tibiis intermediis tarsisque pedibusque posterioribus piceis ; 
antennis testaceis. Long. 27, lat. 142 m.m. 
This species or race greatly resembles such convex forms of D. tripunctatus as 
have the yellow cincture very broad, it has, however, the yellow colour on the 
front of the head and at the sides of the thorax extended over a larger area than in 
any of those forms ; certain individuals from tropical Africa approximate a good 
deal to it in this respect, but the females found in Africa never have the least sexual 
