COLEOPTERA. 319 



cated, and as long as it is wide; eyes large; the body blackish; 

 green above, bronzed beneath and mottled with cupreous-red; 

 two large impressed puncta on each elytron near the suture; 

 base of the antennae, palpi and legs yellowish. Very common in 

 the environs of Paris(l). 



Trechus, Clairv. 



The last joint of the exterior palpi, from its thickest part to its 

 -origin, as long as the preceding or longer, so that the two united 

 make a fusiform body(2) 



The Pentamerous Aquatic Carnivora form a third tribe, that 

 of the Hydrocanthari, Lat. The feet of these Insects are 

 fitred for natation; the four last are compressed, ciliated or 

 laminiform, and the two last at a distance from the others ; 

 the mandibles are almost entirely covered ; the body is al- 

 ways oval, the eyes but slightly prominent, and the thorax 

 much wider than long. The terminal hook of the maxillae is 

 arcuated from its base ; those at the extremity of the tarsi are 

 often unequal. 



They compose the genera Dytiscus and Gyrinus of GeofFroy. 



(1) Add Carabus tricolor, Fab.; C. modestus; cursor; biguttatus,- 4-gutta- 

 tus ; guttula, Id.; C. minutus, Panz. Faun. Insect. Germ. XXXVIII, 10; C. 

 pygmoeus, Fab.; Panz. lb. 11; C. articulatus, Panz. lb. XXX, 21; Cicindela 

 quadrimaculata, L.; Carabus pulchellus, Panz. lb. XXXVIII, 8; XL, 5; C. doris, 

 Panz. lb. 9; Elaphrus rupestris, Fab.; Panz. lb. XL, 6; C decorus, Panz. lb. 

 LXXIII, 4; C. uslulatus, L.; Panz. lb. XL, 7, 9;C. bipunctatus, L.; Oliv. Col. 

 111,35, xiv, 163; Elaphrus ruficollis, Panz. lb. XXXVIII, 21 ; Elaphrus impres- 

 sus, Fab.; Panz. lb. XL, 8; Elaphrus paludosus, lb. XX, 4. 



(2) Trechus rubens, Clairv., Entom. Helv., II, ii, B,b. The Carabus meridianus, 

 which he figures in the same plate, A, a, is a Stenolophus. Carabus micros, Panz., 

 Faun. Insect. Germ. XL, 4. The genus Masohetjs of Ziegler and Dejean, ap- 

 pears to me to approach that of Trechus. The species on which it is- founded is 

 closely allied to the Harpalus collaris of Gyllenhal. The maxillary palpi, as in 

 Trechus, have a fusiform termination, the penultimate joint merely being a little 

 shorter than the last. The anterior tarsi are slightly dilated in the males. This 

 Insect seems to connect Trechus with various small species of the Stenolophus of 

 Dejean. 



The Blemi of these same savanfcare a kind of narrower and more elongated 

 Trechi with a subisometrical thorax, in the form of a reversed and truncated tri- 

 angle, with much larger mandibles that project beyond the labrum. They are 

 found along the sea-coast of France, under stones, and even in the sea. 



