BRUCHUS. 457 
About the size of B. placidus, but shorter and more convex, and distinguishable by 
the scanty clothing of the elytra, which consists of nearly white pubescence, forming 
very slender, extremely indistinct, white longitudinal lines on the black ground, and 
between these lines two transverse series of equally faint white flecks across the middle. 
The second, third, and fourth joints of the antenne differ but little in their lengths, 
and the penultimate joints are strongly transverse. The hind tibie are armed at the 
extremity with a rather short spur, not quite so long as the width of the apex of the 
tibia. Only one example was met with in each locality. The black ground-colour in 
this insect is feebly diluted with red, and this slight reddening is more conspicuous in 
the example from Guatemala than in the Bugaba exponent. 
38. Bruchus crassulus. 
Brevis, convexus, niger, subtus pallide griseo-vestitus, supra pallide subvariegatus; antennis brevibus, crassis,. 
testaceis, medio fuscis ; tibiis quatuor anterioribus testaceis; femoribus posterioribus dente parum elongato 
armatis. 
Long. 3 millim. 
Hab. Panama, Volcan de Chiriqui, 2500 to 4000 feet (Champion). 
This species is readily distinguished by the single tooth of the femur, there being on 
its hind margin only a faint indication of one additional denticle ; the femur is not much 
dilated, and the thick tibia is scarcely at all curved, and there is a short but quite defi- 
nite mucro at its extremity. So far as I can judge by a single individual, there is no 
distinct pattern on the upper surface, which, however, is much flecked in an irregular 
manner with white, and the black ground-colour is indefinitely spotted with red. The 
antenne are coloured in a similar manner to those of B. obsoletus, but are considerably 
shorter; the general shape is shorter and more convex than in B. obsoletus, and the 
pygidium is longer and narrower. 
39. Bruchus vacillator. 
Niger, hic inde tenuiter griseo-maculatus ; antennis pedibusque anterioribus et intermediis testaceis, illis bre- 
vibus et latis, articulis penultimis fuscis ; femoribus posterioribus dente elongato denticulisque duobus. 
instructis. 
Long. 4 millim. 
Hab. Mexico, Guanajuato (Sallé). 
This is another species represented only by a single example. It has much the 
appearance of B. incensus and B. pictifemur, but is distinguished from them by the 
form of the thorax, which is not so elongate and has not concavely-arcuate sides. 
The head is very short, the eyes widely separate, the vertex not carinate. The thorax 
is rather short, much narrowed to the front, coarsely punctate, minutely speckled with 
ochreous pubescence, on the middle with two distant, very minute, white specks. 
Elytra rather elongate, finely striate, minutely speckled with ochraceous and pallid grey. 
BIOL. CENTR.-AMER., Coleopt., Vol. V., November 1885. 3n 
