124 ADEPiiAGA. [rcrilephis. 



armed with a curved spine beneath : three species are comprised in the 

 genus besides our own, which is the only one found in Europe ; these 

 are found respectively in the Island of Bourbon, in TeneriOe, and in 

 JSTubia. 



P. areolatus, Creutz. Oblong, pubescent ; head and thorax pitch- 

 black, elytra pitchy or brownish, with a common lighter patch across the 

 middle ; antennae- brownish with base lighter ; thorax hardly broader 

 than the head with eyes, almost as long as broad, cordiform, much con- 

 tracted behind, posterior angles sharp, projecting, dorsal furrow deep, 

 base with a shallow fovea on each side near posterior angles ; elytra much 

 depressed, almost parallel-sided, more finely pubescent than thorax, with 

 rather well markecl, feebly punctured striae,, becoming evanescent towards 

 sides and feebler towards apex, third interstice with the usual two pores ; 

 legs yellowish red. L. 2| mm. 



Rare, although found in some numbers where it occurs. Dudden Sands, near 

 Broughton-in-Purness, Lancashire ; Conway (confluence of the Conway and Lhigwy), 

 Nortli Wales (Brewer, &c.); Scotland very local, riparial, Solway district (taken in 

 some numbers by Dr. Sharp) ; it ranges over the middle and south of Europe, and 

 has occurred in Norway, and it is found also in Algeria and the Caucasus district. 



AEPUS, Samouelle. 



This genus comes nearer to Trechus than does the genus PeriJephis, 

 and forms a further link in the chain of connection between the Eem- 

 bidiina and Trechina, the palpi being intermediate in form between the 

 two above-mentioned genera ; the ligula is plurisetose as in Treclnis ; 

 the anterior tarsi have the penultimate joint armed with a spine as in 

 Perileptus and Lymnoium: the species are remarkable for their structure, 

 and also for their peculiar habits ; they are found under stones, usually 

 below high-water mark in spots that are entirely submerged at high 

 water ; occasionally a curious Hemipteron AepopMlus is found in com- 

 pany with them ; four species are known, two from Europe, one from 

 Madeira, and one from Chili : the larva of Aiipus is described by 

 Co(iuerel (Annal. de la Soc. Ent. Fr. 1850, p. 529, PI. xvi., Fig. 3); 

 it is found in the same situations as the perfect insect, and is distin- 

 guished by its very large head and mandibles ; like the larvte of Bem- 

 bidium it possesses only one tarsal claw ; Westwood figures this larva 

 and the pupa in error as those of Mkrahjmma Johnsfoni, a species which 

 is found in the same situations as Aepus. (Classif. i. p. 166, Fig. 15, 16 ; 

 see also page 169.) Cf. Laboulbene, Ann. Fr. 1862, p. 564-65, 



I. Dorsal furrow of thorax deep ; elytra longer, parallel- 

 sided A. MAEINUS, Strom. 



II. Dorsal furrow of thorax indistinct ; elytra short, some- 

 what widened behind A. ROBINII, Lahoulb. 



A. xnarinus, Strom. {fuJvescem, Sam.). Entirely testaceous, 

 apterous, very depressed, slightly pubescent, with long outstanding hairs 

 especially at apex and sides of elytra ; head very large, as long as thorax, 



