316 INSECTA. 



the shores of rivers, Sec. in Europe, North America, Egypt and the 

 Cape of Good Hope. M. Desmarest has described the larva of the 

 most common species. Its form approaches that of the larva of a 

 Dytiscus. The anatomical observations of M. Dufour appear to 

 confirm this affinit\(l). 



The others, in which the body is tolerably thick, have large and 

 very prominent eyes; antennae that are slightly enlarged near the ex- 

 tremity, and composed of short joints, mostly in the form of a top 

 or of a reversed cone; one of the two spurs of the internal extre- 

 mity of the two anterior tibiae is inserted higher than the other, with 

 a notch between them. The four or three first joints of the anterior 

 tarsi of the males are in general but slightly dilated. The palpi 

 are never elongated. They are shore Insects, and peculiar to Europe 

 and Siberia. 



Sometimes the labrum is very short, transversal, and terminated by 

 a straight line. The last joint of the exterior palpi is. almost obco- 

 nical, thicker and truncated at the extremity. The mandibles ad- 

 vance considerably beyond the labrum. The anterior tarsi of the 

 males are sensibly dilated. 



Elaphrus, Fab. — Elap/irus, Blethisa, PelophilayDe']. 



In some of them, and the largest — Blethisa^ Bonelli — the thorax 

 is wider than it is long, plane, bordered laterally, almost square and 

 slightly narrowed towards the posterior angles. 



Here, the three first joints of the anterior tarsi of the males are 

 strongly dilated and cordiform. They are the Pelophilee of De- 

 jean(2). 



There, the four first joints of the anterior tarsi of the males are 

 slightly dilated — they form the Blethisa, Dejean(3). 



In the others, the thorax is at least as long as it is wide, convex, 

 cordiform and truncated. The body is proportionably more convex 

 than in the preceding subgenera. The four first joints of the ante- 

 rior tarsi are slightly dilated in the males. These latter alone com- 

 pose his genus Elaphrus. 



E. uliginosiis; C. iiliginosus, Fab.; Blaphnc» riparius, Oliv., 

 Col. II, 34,1, 1, A — E. About four lines in length, of a black- 

 ish-bronze, with numerous puncta; little depressions or fossulae 

 on the front and thorax, and others with a violet bottom and 



(1) See Encyclop. Method., article Omophron,- Entom. Helv., II, xxvi; Lat. 

 Gener. Crust, et Insect. 1, 225, vii, ", and the Spec. Dej., II, p. 257, et seq- 



(2) Carabus borealis,Tsib. ; Nebrialorealis, Gyllenh. ;Panz. Faun. Insect Germ. 

 LXXV, 8. 



(3) Carubui muUipunctatus, Fab.; Panz. lb. XI, 5. 



