406 INSECTA. 



The following species is placed by Count Dejean among his 

 Tachypi. 



B. Jiavipes ; Panz. Faun. Insect. Germ. XX, 2 ; Cicindela 

 Jiavipes, L. Very similar to the Elaphrus riparius ; two lines in 

 length ; thorax rather nai'rower than the head, cordiform, trun- 

 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 *. 



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 f . 



The Pentamerous Aquatic Carnivora form a third tribe, that of 

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

 natation ; the four last are compressed, ciliated or laminiform, and 

 the two last at a distance from the others; the mandibles are almost 



Certain species, whose thorax, although narrowed near the posterior angles, is 

 less than in the others, so that the posterior margin is scarcely narrower than the 

 anterior, compose the genus Notaphus, Dej. and Megerle. 



Among those in which the thorax is considerably narrowed behind, its length 

 is sometimes only a little greater than its width, and it has the form of a truncated 

 heart : such are the Peryphus of these naturalists. Sometimes much shorter in 

 proportion, its form approaches that of a cup or of a heart with a very broad base ; 

 in some it is even rounded at the posterior angles. They form the genus Lcja of 

 the same. The Tachypi, on account of the extraordinary protuberance of their 

 eyes, and other relations to the Elaphri, are sufficiently distinct ; but such is far 

 from being the case with the other genera ; it is impossible to mark them by rigor- 

 ous characters. Those which might be drawn from the respective and comparative 

 length of the second and third joint of the antennae, appear to me to be also uncer- 

 tain. See the Catal. de la Coll. des Coleop., of Dejean. 



* Add Carabus tricolor, Fab.; — C. modeslus ; — cursor; — biguttatus ; — 'i-gutfafus ; 

 — yullultt, Id.;— C. minutus, Panz. Faun. Insect. Germ. XXXVIII, 10 ;— C. 

 pygmceus, Fab.; — Panz. lb. 11 ;— C. articutatus, Panz. lb. XXX, 21 ; — Cicindela 

 quadrimaculata, L; — Carabus pulchellus, Panz. lb. XXXVIII, 8; XL, 5 ; — C. do)-is, 

 Panz. lb. 9 ; — Elaphrus rvpesi)^, Fab. ; Panz. lb. XL, 6 ; — C. decoi-us, Panz. lb. 

 LXXIII, 4 ;— C. usiululus, L. ; — Panz. Tb. XL, 7, 9 ; — C. bipvnctatus, L. ; Oliv. 

 Col. Ill, 35, xiv, 163; — Ehiphnis rujicollis, Panz. lb. XXXVIII, 21; — Elaphms 

 imprtssus, Fab.; Panz. lb. XL, 8 ; — ElapJirus paludosvs, lb. XX, 4. 



f Trechus riibens, 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 Masoreus of Zicgler and Dejean appears 

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

 allied to the Harpulus coUaris 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 savans are a kind of narrower and more elongated 

 Trechi with a subisomctrical thorax, in the form of a reversed and truncated trian- 

 gle, 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. 



