730 On Aquatic Carnivorous Coleoptera or Dytiscidce. 



differ iu any definite uianaer from the East Asiatic form : tlie 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 as' a 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 15^ by 9, while one of 

 the shortest measures 27 m.m. by lih, by 8^; 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 

 elono-ate and peculiar of the African specimens are found in South Africa. 



The specimens found iu 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, ely tris 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. 14* 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 



