On Aquatic Carnivorous Coleopiera or Dytiscide. 561 
esculpturatis, margine anteriore extus abrupte minus longe deflexo; prosterni 
processu apice sat elongato. Long. 8, lat. 4 m.m. 
The male has the basal joints of the 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 seoment is with- 
out carina or rugee. 
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 
I. limbatus (No. 794), and in respect to the structure of its cox 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, (Yanghi-hissar). 8953. 
804. Ilybius apicalis, Sharp, Tr. Ent. Soc. Lond. 1873, p. 51.—Ovalis, sat con- 
vexus, sat nitidus, rufus, supra vneus, limbo late ferrugineo ad apicem trihamato ; 
5) 
supra densius subtiliusque reticulatus ; pedibus posterioribus brevibus et crassis, 
coxis valde elongatis, fere esculpturatis, margine anteriore extus abrupte longiusque 
deflexo. Long. 9, lat. 3? m.m. 
The male has the basal joints of the front 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, eacept 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 Ilybu, 
and by its large hind coxe approximates to Coptotomus; the prosternum has the 
longitudinal ridge along its middle not so acute as in the other Ilybii. 
Japan, 855. 
UnassociaveD Grnera. (Nos. 54 to 60). 
The following seven genera are not sutticiently accordant inter se 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 ciliz at 
the angle of the posterior femur, such as exists in the Agabini; and they do not 
possess the stigmatic rugee of the Colymbetiai; and their individuals are nearly 
always inferior in stature to those of the latter group. 
