414 G. R. CROTCH, M. A. 



joint shorter than the tibial spur, claws equal. % four anterior tarsi 

 compressed, narrowly dilated, claws simple. 



This genns differs from 1/j/Lius by the sexual characters, and from 

 Agabus by the narrow laciniae. 



I. regularis, (Leo.) Ann. Lye. v., 20.3. — Rather obovate, very convex, 

 uniformly reddish-brown, above darker; thorax with the sides nearly straight- 

 the margin rather broad but very faintly indicated; elytra thickly and closely 

 rugulose ; dorsal series visible, irregular, a well marked pale spot behind the 

 middle; posterior femora short, punctulate, apical angle produced, acute, cili- 

 ate, tarsi very short, spurs long unequal, last joint equal to fourth; 'J, tarsal 

 claws simple. 



San Diego. (Leconte, Horn.) 



llyobius ohhmgus, Mots. B. M., 1859, p. 48, seems to be a variety 

 of this species in which the lateral spots are obsolete. 



I ? bifarius, (Kirby) Faun. B. A. iv., p. 71, pi. 5, f. 6. — Ovate, sub-convex, 

 black, head in front and legs red; thorax rather short, sides a little rounded, ru- 

 fescent. broadly margined : elytra shining covered with minute longitudinal 

 striolae which do not anastomose (after the middle these begin to slope towards 

 the suture) ; prosternal process acutely carinate, posterior tibiae smooth, spurs 

 unequal, last joint of tarsi larger than fourth. % anterior tarsal claws elong- 

 ate, sinuate. 9 surface opaque. L. - 27 inch. 



Canada. (Horn, Leconte.) 



This species will probably form a new genus, or possibly go in 

 Eriglemis Th. ; it agrees with I. regularus in the shape of the 

 laciniae. 



AGABUS, Leach, Zool. Misc. iii., p. 69. (Type serricornix.) 

 Thorax margined, presternum acutely carinate, nietasteruuui emar- 

 giuate, short, laciniae linear, episterna not reaching the coxae ; claws 

 equal. % antennae with the joints dilated, forming a club; four an- 

 terior tarsi dilated, with very small discs beneath. 



A. Clavatus, Lee. Col. Kansas, 1859, p. 4. — Elongate oval, rufo-testaceous, 

 elytra darker; thorax with the sides straight, rather thickly margined; elytra 

 very finely punctulate, the serial punctures visible and very con fus^d : pos- 

 terior tibiae smooth (except the external row of deep punctures), ventral seg- 

 inents smooth, with a few scattered piliferous punctures. % antennae with the 

 last six joints incrassate, flattened, the last three infuscate; anterior claws 

 elongate. L. - 34 inch. 

 Kansas. (Leconte.) 



GAAIROBYTES, Thorns. Skand. Col. ii., p. 57. (Type gut aim.) 

 Distinct from Agabus by the triangular laciniae of the metastemum, 

 and simple antenna?. It contains the greatest part of the Eriehsonian 



