640 STAPHYLINIDZA. 
not permit their association with the “Stenine.” The subfamily will include Stenes- 
thetus and Ctenomastax, besides its typical genus, and some others that have already 
been associated with Hvwsthetus ; and I have little doubt that Turellus (Sharp, Tr. Ent. 
Soc. Lond. 1876, p. 423), for which I have not previously ventured to suggest a position, 
also belongs to it. | 
EDAPHUS. 
Edaphus, Leconte, Class. Col. N. Amer. 1st edit. p. 67 (1861); Leconte & Horn, ibid. 2nd edit. 
p. 98 (1883). 
Tetratarsus, Schaufuss, Nunq. Ot. ii. p. 460. 
This genus consists of only five or six species, but has already been detected in North 
America, Europe, and Eastern Asia. ‘These insects are remarkable from their great 
resemblance to Luplectus in the Pselaphide. . 
1. Edaphus euplectoides. (Tab. XVII. fig. 1.) 
Dilute piceus, pedibus dilutioribus, nitidus, fere glaber, impunctatus; capite inter oculos depresso; prothorace 
basi profunde impresso. 
Long. vix 13 millim. 
Hab. Guatemata, Capetillo (Champion). 
Of short convex form, with small head. Antenne with the two terminal joints 
abruptly larger than the others. Head deeply depressed, and the surface thickened 
and somewhat raised in front of the depression. ‘Thorax broader than long, constricted 
at the base; behind with four fovese forming an almost continuous transverse depression, 
the pair on each side being only indistinctly separated, and the two pairs divided in the 
middle by a plica. Elytra longer than the thorax, with fine sutural strie, impunctate, 
polished. Hind body very short. 
The two examples obtained exhibit no sexual characters. 
Subfam. STENIN A. 
Rey’s recent definition of “Stenides” is satisfactory, and as a subfamily these insects 
are well distinguished by the quite exposed insertion of the antennae, and the broad 
separation of the hind coxe by a bilobed process of the metasternum, in conjunction 
with the small anterior cox inserted at the posterior part of the prostenum. The 
subfamily will comprise only Dianous and Stenus, for Megalops, which has been placed 
in it by some authorities, differs in some important structural particulars. 
STENUS. 
Stenus, Latreille, Préc. des Car. Gén. des Ins. p. 77 (1796) ; Erichson, Gen. et Spec. Staph. p. 689. 
Hemistenus, Motschoulsky, Bull. Mosc. 1860, pt. 2, p. 557. 
Areus, Casey, Rev. Sten. N. Am. p. 150. 
This genus is one of very large extent, about 500 species being known, and as it is 
