252 HETEROMERA. 
still finer and shallower towards the apex, the interstices quite flat throughout; the rest much as in 
M. isthmicus. 
Length 83-9 millim. (3 2.) 
Hab. Panama, Bugaba (Champion). 
Two examples, differing as above. 
ELOMOSDA. 
Elomosda, ¥. Bates, Ent. Monthly Mag. vi. p. 273 (1870). 
This genus is apparently confined to Central America; it contains a single species 
of large size. Elomosda somewhat closely resembles the genus Hegemona of the 
“‘ Misolampides.” 
1. Elomosda belti. 
Elomosda beltii, F. Bates, loc. cit. p. 275, t. 2. f. 8, go’. 
Hab. Guaremaua, Coban (Champion); Nicaracua, Chontales (Belt 1, Janson, coll. F. 
Bates). 
ACROPTERON. 
Acropteron, Perty, Del. Anim. artic. de Brasil. p. 64 (1830); Lacordaire, Gen. Col. v. p. 426; 
Maklin, Monogr. in Act. Fenn. vii. p. 103 (1862). 
Arthroplatus, Solier, in Gay’s Hist. fisica y politica de Chile, Zool. v. p. 246. 
Sphenosoma, De}. Cat. 3rd edit. p. 233. 
This genus contains a large number of closely allied species, all of which are confined 
to Tropical America; Maklin, in his Monograph (op. cit.), described twenty-two, 
including two from Central America, and since then none appear to have been recorded. 
Twelve species inhabit our country, no less than ten of which are described as new. 
The species are apparently not widely distributed, and seem to be confined to a limited 
area. A large number of undescribed South-American forms exist in collections. I 
have not been able to trace for certain a single one of our species south of the isthmus 
of Panama, nor to identity any of the Central-American species before me, A. agriloides 
excepted, with any of those described by Maklin. The Central-American species all 
belong to Maklin’s “ Division B,” in which the thorax is uninterruptedly margined at 
the base. 
Certain South-American species (A. rufipes, &c.) are of a bright metallic green or 
purple tint (these mostly belong to Maklin’s “ Division A,” in which the basal margin | 
of the thorax is more or less obsolete in the middle); those inhabiting our country, 
however, are all more or less of a greenish-bronze or brownish-zneous colour. The 
males of some species have the underside of the femora (more distinctly so in the South- 
American forms of Maklin’s “ Division A”) fringed with short hair beneath *, and the 
trochanters with a few longish bristles; the posterior tibie shallowly or abruptly emar- 
* This and the shorter antenne in the female are the only sexual characters noticed by Miklin and 
Lacordaire. 
