448 BRUCHIDES. 
17. Bruchus aberrans. (Tab. XXVI. fig. 7.) 
Convexus, subtus albido-griseo-vestitus ; supra nigro-fuscus, prothorace ochraceo bilineato, elytris versus suturam 
nigro ochraceoque submaculatis ; pygidio nitido, apicem versus albido notato ; abdomine ad latus utrinque 
nigro, nitido; pedibus anterioribus testaceis, posterioribus nigris, tarsis testaceis; antennis clavatis, 
articulis 5° ad 11™ longitudine laterioribus ; femoribus posterioribus inflatis, subtus externe multiserratis, 
interne a medio ad apicem dentibus irregularibus minus elongatis, circiter sex, instructis. 
Long. 4—5 millim. 
Hab. Panama, David, Bugaba, Taboga Island (Champion). 
This is a very peculiar species, apparently not nearly allied to any known form. The 
very broad antenne, the strongly and regularly arcuate tibie, and the remarkable 
adornment of the pygidium make it easily recognized. The head is somewhat narrow 
and rostrate, but much less so than in B. brasiliensis. The thorax is very narrow 
in front, much broader behind, with the sides concavely arcuate and the hind angles 
acute, the base strongly lobed in the middle. The elytra are finely punctate-striate. 
The pygidium is finely pubescent and dull at the base, but beyond this is shining and 
sparingly punctate, and adorned with a narrow mark of very dense white pubescence, 
which in the female forms an oval spot separated by about its own length from the 
hind margin, but in the male is more elongate so as to reach the extremity. 
A series of fourteen examples was obtained showing considerable variation in size and 
in the depth of the ground-colour, which is sometimes nearly black, sometimes of a dark 
vinous-red tinge. The example figured is a female from David. 
The antenne and general form suggest that this should belong to the subgenus 
Pachymerus, but the different armature of the femora, and the fact that the meta- 
sternum is not perpendicular in front will necessitate the isolation of the species in a 
separate subgenus or genus. 
§ 2. Thorax conic, its sides either not curvate, or slightly convexly arcuate ; hind femora 
only moderately dilated, armed with a tooth and one, two, or three denticles ; 
antenne rather short, simple, only subserrate ; ventral rings never elongate, the 
penultimate three usually very short ; pygidium usually perpendicular. 
This group, so far as our species are concerned, is homogeneous, but it is approximated. 
by various members of Groups § 1, § 3, § 4, § 5, and 9 6. 
18. Bruchus mundulus. 
Convexus, niger, fusco albidoque variegatus, antennarum basi pedibusque rufis ; prothorace pygidioque singulo 
ad basin in medio macula conspicua albida; femoribus posterioribus sat dilatatis, dente parum elongato 
denticulisque omnium minutissimis duobus instructis. 
Long. 23 millim. (capite deflexo). 
Hab. Mexico, Guanajuato (Sallé). 
Antenne short and very broad; five basal joints red, the others black and strongly 
