On Aquatic Carnivorous Coleoplera or Di/tiscidce. 561 



esculpturatis, marginu antei'iore extus abrupte minus longe deflexo ; prosterni 

 j^rocessu apice sat elongate. Long. 8, lat. i ra.m. 



The male has the basal joints of tlie front and middle tarsi a little incrassate, and 

 furnished beneath with rather short hairs bearing minute palettes ; the claws of the 

 front feet are rather short, and the anterior one rather strongly curved ; there is 

 only a very slight difference between the two claws on the hind feet, the outer 

 being scarcely at all shorter than the inner one, the apical ventral segment is with- 

 out carina or rugte. 



I have before me only one extremely immature male individual of this very in- 

 teresting .species, the claws of the hind tarsi completing the connexion in -this 

 respect with the genus Agabus. It is in size, colour and form extremely similar to 

 1. limbatus (No. 794), and in respect to the structure of its coxce and prosternal pro- 

 cess connects it with Dytiscus fuliginosus (No. 792), the wings of the metasternum 

 being decidedly a little less abbreviate than in D. fuliginosus. 



Centra] Asia, (Yauglii-hissar). 853. 



804. Ilybius apicalis, Sharp, Tr. Ent. Soc. Lond. 1873, p. 51. — Ovalis, sat con- 

 vexus, sat nitidus, rufus, supra a?neus, limbo late ferrugineo ad apicem trihamato ; 

 supra densius subtiliusque reticulatus ; pedibus posterioribus brevibus et crassis, 

 coxis valde elongatis, fere esculpturatis, margine anteriore extus abnipte longiusque 

 deflexo. Long. 9, lat. 3f m.m. 



The male has the basal joints of the IVont and middle tarsi a little incrassate, 

 and furnished beneath with rather short hairs, which bear small palettes; the claws 

 on the front feet are short, and the anterior one rather strongly curved ; the outer 

 claw on the hind feet differs little from the inner one, except that it is distinctly 

 shorter ; the last ventral segment is simple in both sexes. 



This species is in respect of its hind legs the most highly developed of the Ilybii, 

 and by its large hind coxse approximates to Coptotomus ; the presternum has the 

 longitudinal ridge along its middle not so acute as in the other Ilybii. 



Japan. 855. 



Unassoci.\ted Genera. (Nos. 54 to 60). 



The following seven genera are not sutficiently accoi'dant inter ae to justify their 

 establishment as a natural group ; but they may readily be recognized by the 

 following negative characters. They none of them possess the group of ciliee at 

 the angle of the posterior femur, such as exists in the Agabini ; and they do not 

 possess the stigmatic rugoe of the Colynibetiui ; and their individuals are nearly 

 always inferior in stature to those of the latter group. 



