DIONYCHUS.—SCLEROSOMUS. 313 
DIONYCHUS. 
Dionychus, Germar, Ins. Spec. Nove, p. 311 (1824) ; Schénherr, Gen. Cure. iii. p. 580; vii. 1,p.18; 
Lacordaire, Gen. Col. vii. p. 41. 
The species of this genus, if D. parallelogrammus be taken as the type, are scarcely 
separable from Cholus, except by their stouter legs. 
1. Dionychus parallelogrammus. 
Dionychus parallelogrammus, Germ. Ins. Sp. Nove, p. 314, t. 1. figg. 9,961; Schénh. Gen. Curc. 
i. p. 583°; Lacord. Gen. Col. vii. p. 41, nota’. 
Archarias sulcatus, Stev. Mus. Ces. Mosq. ii. p. 99+. 
Hab. Panama, Chiriqui (7rétsch).—Braziu }-3, 
We have received a single specimen (a small ¢ ) of this species from Chiriqui. The 
male has the rostrum and legs longer and more slender than the female. In fully 
developed examples of the former sex the prosternum is feebly bituberculate towards 
the anterior margin. ‘The vestiture of the under surface is very dense and piliform. 
SOLENOPUS. 
Solenopus, Schonherr, Curc. Disp. Meth. p. 268 (1826); Gen. Cure. iii. p. 597; Lacordaire, Gen. 
Col. vii. p. 44. 
A genus including several conspicuous well-known South-American forms, one of 
which has been recorded from Mexico. The males, at least of S. cacicus, S. spinicollis, 
and S. dilineatus, differ from the females in having the prothorax rounded at the 
sides, and as wide as, or a little wider than, the elytra; the rostrum and legs much 
thickened, the latter clothed with very long projecting hairs in S. cacicus; the anterior 
coxe flattened and transversely lamellate in front; and the metasternum and the base 
of the abdomen very broadly excavate. In both sexes the prosternum is bituberculate 
behind the anterior coxe. 
1. Solenopus bilineatus, (Tab. XVI. figg. 25, 3; 25a, prosternum. ) 
Solenopus bilineatus, Lacord. Gen. Col. vii. p. 45, nota*; Pasc. Journ. Linn. Soc., Zool. xi. p. 475? 
Hab. Mexico! (coll. Pascoe, in Mus. Brit.).—Gutana, Cayenne ?. 
Apparently not uncommon in Guiana. The habitat ‘‘ Mexico ” requires confirmaticn, 
A male from Cayenne is figured. 
SCLEROSOMUS. 
Sclerosomus, Schénherr, Gen. Cure. ili. p. 604 (1836) ; viii. 1, p. 22; Lacordaire, Gen. Col. vii. p. 45. 
A genus including a few South-American forms*, and one from Mexico is now 
added. It is chiefly recognizable by the very short metasternum, and is separable 
* Dionychus mutabihs, Féhr., has a very short metasternum, as in S. incommodus, Gyll. 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 4, January 1904. 2SS 
