Enykdus.] CLAVIOORNIA. 101 



in June, 1879, the rare species E. minutissimus, Aube, in large numbers 

 in flood refuse at Eepton ; this species was then unknown to Britain, 

 and rare on the continent; the collector, however, who has in recent 

 years given most work to the British Euplecti, is Mr. W. G. Blatch, 

 whose arrangement I have in the main followed, and to whose valuable 

 monograph on the genus (published in the Entomologists' Monthly 

 Magazine, for February, 1886) I am much indebted, as I am also to 

 Mr. G. E. Waterhouse's monograph which appeared in the Transactions 

 of the Entomological Society, Vol. I., 3rd Series, Part II. 



The species of Euplectus are distinguished from Triclwnyx and the 

 continental genus Far onus by the fact that the tarsi have only a single 

 claw ; the sexual differences, as a rule, are unimportant, but are very 

 marked in one or two cases. 



I. Abdomen with a more or less sharply defined de- 



pressed area in the middle of base of the two first 

 visible dorsal segments ; dorsal striae on elytra 

 distinct, and reaching more or less nearly to 

 middle, 

 i. Colour lighter, red, or rufo-testaceous. 



1. Head with a distinct basal fovea ; length 2 mm. E. KuNZEI, Avh&. 



2. Head without any distinct basal fovea ; length 



less than 2 mm. 



A. Antenna? longer; size larger; frontal fur- 



rows broader E. DUPONTI, Aube. 



B. Antenna) shorter ; size smaller;' frontal fur- 



rows narrower and more curved .... 



a. Head and thorax more or less strongly 



punctured throughout; head broader, 

 a* Thorax less narrowed behind ; the two 



large frontal punctures on the head not 



situated close to side margins . . . . E. PUNCTATUS, Mule. 

 b* Thorax more narrowed behind ; the two 



large frontal punctures on the head 



situated close to the hind margins . . . E. KAESTENI, Reich. 



b. Head punctured only at sides above eyes ; 

 thorax not, or scarcely punctured; head 



narrower E. SiCUfATUS, Eeich. 



ii. Colour darker, pitchy-black, brownish-red, or cas- 

 taneous. 



A. Head with a distinct basal fovea E. NANUS, Reich. 



13. Head without any distinct basal fovea 



a. Antenna? shorter ; head longer in proportion 

 to its width (usual habitat in hot-beds and 



decaying grass heaps) E. SANGUINEUS, Denny. 



b. Antenna? longer ; head shorter in proportion 

 to its width ; (usual habitat under bark and 



in decaying wood) E. PICEUS, Mots. 



(nigricans, Chaud.) 



II. Abdomen without any distinct depressed area at the 



base of the first two visible dorsal segments ; dorsal 

 stria on elytra very short or entirely absent. 

 i. Elytra with short dorsal striae; colour rufo-tes- 

 taceous j length 1}-1 T 7 S mm E. NTTBIGENA, Reitler. 



