Genera Bledius, Heterocerus, and Dyschirius. 33 
I. Eyes finely granulated, naked. Middle coxz distant from one another. 
OxyTELus, PLATysTETHUS. 
II. Eyes coarsely granulated, hairy. Coxe approximated. 
1, No antennal grooves. 
a. Legs calculated for rooting; anterior tibize with only one row of 
spines, emarginate at the point. The lateral rib of elytra close 
to the margin. 
‘ | HAPLODERUS. 
6. Legs calculated for running ; tibie with fine hairs, not emarginated. 
he lateral rib of elytra distant from the margin. 
CARPALIMUS. 
2. Antennal grooves in front of the eyes. 
Legs constructed for digging; anterior tibize whole, with double row 
of spines; lateral nb of elytra distant from the margin. 
BLEDIvs. 
Two attempts have been made at a subdivision of the old 
genus Bledius, Leach; but they have failed to command general 
support, having been aimed rather at an isolation of some more 
remarkable species than a careful analysis of the mutual rela- 
tions of the species in general. Nevertheless such a general 
analysis, carefully executed, reveals so many important differ- 
ences between the species, particularly in the structure of the 
mouth and the prothorax, that it becomes impossible to preserve 
Bledius, Leach, as an undivided natural genus. This will have 
become manifest already to those who have studied the descrip- 
tions and details of the larva whiclh-I have given on a former 
occasion™ ; and the divisions of the old genus suggested by the 
differences between the larve correspond most closely to those I 
have now to point out in the perfect insects, and which may be 
thus summed up :— 
I. Terminal part of mandibles thick, with a strong sharp tooth be- 
hind the apex. Inner lobe of mazille spinulous, the terminal 
spines blunt and powerful. Anterior margin of Jabium straight ; 
lobes rounded, their margins ramified all round; the spines of 
the comb (see above, p. 32) ramified at their points. Posterior 
corners of pronotum rounded, not separated from the posterior 
margin. 
A. Sockets of first pair of cove externally open. 
Lobes of /abellum with three elongated ramifications, the innermost of 
which is very long, all profusely subdivided. 
Spinulous ridges of anterior tibie widely separated. 
BLeEDIvs, s. str. 
Danish species :—1. B. tricornis, Herbst, fr. Sometimes re- 
* In the “ Observationes de Metamorphosi Eleutheratorum,” in vol. iti. 
of the ‘ Naturhist. Tidsskrift,’ tab. 12. 
Ann, & Mag. N, Hist, Ser. 3, Vol. xx. 3 
