BRUCHUS. 4538 
of the surface uniform, and the second joint of the antenne smaller, so that there is a 
conspicuous difference between it and the third joint. The mucro at the extremity of 
the hind tibia is very short, as in B. obsoletus. It is equally similar to B. difficilis, but 
that species has the third joint of the antenne small, and three distinct denticles on the 
hind femur. Only four very fragmentary examples are before me, but from these it is 
clear that the colour of the surface is variable; when there is a vitta of red colour on 
the elytra the resemblance to B. difficilis is considerably increased. I am not able to 
detect any sexual characters. 
27. Bruchus pruininus. 
? Bruchus pruininus, Horn, Trans. Am. Ent. Soc. iv. (1878), p. 3277. 
Hab. Norta America, Arizona 1—Mexico, Guanajuato (Sal/é). 
I refer a single mutilated example to this species with some doubt. It presents no 
salient points of distinction when compared with Horn’s description 1, except that it is 
apparently less densely clothed with pubescence. It is exactly similar in appearance to 
B. vexatus, but the thorax is shorter, the two basal spots are not present on it, the 
hind femur bears two denticles in addition to the tooth, and there is apparently no 
mucro to the tibia. This last point is not quite clear, as the hind legs are much 
mutilated. 
28. Bruchus vexatus. 
Niger, tenuiter albido-vestitus ; prothorace basi utrinque scutelloque albo-maculatis, antennarum basi tibiisque 
anterioribus fuscis ; prothorace conico, fortiter punctato; femoribus posterioribus dente lato armatis. 
Long. 23 millim. 
Hab. Mexico, Toxpam (Salle). 
Head short and broad, eyes widely separated. Antenne short, the basal joints infus- 
_-eate yellow ; third joint a good deal longer than the second or the fourth, penultimate 
joints strongly transverse. Thorax rather elongate, very coarsely punctate, clothed 
sparingly with white pubescence, which is concentrated at the base on each side to form 
a small spot; scutellum densely clothed with white pubescence. LHlytra rather elongate, 
somewhat deeply striate ; black, sparingly but uniformly clothed with very fine white 
pubescence ; interstices not sculptured. Under surface rather more closely and less uni- 
formly clothed with white pubescence ; hind coxe quite bare. Pygidium rather small. 
Hind femora short, somewhat incrassate, armed with a single rather large tooth; tibia 
short and stout, slightly curved at the base, armed at the extremity with a rather short 
mucro. 
29. Bruchus pertinax. 
Niger, griseo-vestitus, supra variegatus ; antennarum basi tibiisque anterioribus testaceis ; antennis brevibus, sat 
