400 HETEROMERA. 
9. Macrobasis beckeri. (Tab. XVIII. figg. 20,3; 20a, antenna, ¢ .) 
Macrobasis bekeri (sic), Dugés, An. Mus. Michoacano, ii. p. 118 bis’. 
Hab. Mexico, Canelas in Durango (Becker '). 
Found in numbers by Mr. Becker. Specimens of both sexes are before me. 
M. beckeri agrees with M. diversicornis in the form of the antenne and anterior 
tarsi in the male; but differs from that species in the finer, darker, and sparser 
pubescence of the upper surface. The sides and front of the head, the occiput, and 
the sides, base, and apex of the thorax, and the suture very narrowly, are cinereo- 
pubescent, the rest of the pubescence being brown. All our specimens are more or 
less abraded and discoloured. 
10. Macrobasis humeralis. 
Macrobasis humeralis, Dugés, An. Mus. Michoacano, i. p. 58°. 
Hab. Mexico, Tepic (Flohr *). 
We have apparently not received an example of this species, both sexes of which are 
described by Dugés. “The antenne of the male are filiform, their first joint longer 
than the head, and equal to joints 2-4 united, the second joint longer than the third, 
and about one half as long as the first, joints 3-10 subequal, 1 and 2 shining. The 
head and thorax are black, the elytra ferruginous. The pubescence is greyish-yellow ; 
the elytra with a spot on either side of the scutellum and a streak on the humeral 
callus blackish-pubescent.” The form of the anterior tarsi of the male is not mentioned. 
11. Macrobasis tenuicornis. (Tab. XVIII. figg. 21,3; 21a, antenna, ¢ .) 
Elongate, black, above and beneath rather densely cinereo-pubescent, the elytra with a small spot at the base 
on either side of the scutellum and a small patch on the humeri blackish- or brown-pubescent ; the legs 
cinereo-pubescent, the tarsi in great part and the tips of the femora and tibize brown-pubescent. Head 
moderately large, very closely and finely punctured, with a fine median line, the latter ferruginous 
anteriorly, the palpi pitchy-brown; antennx black, very slender, setaceous, the basal joints very little 
thickened in the male; prothorax nearly as wide as the head, as long as broad, rounded at the sides 
anteriorly, parallel behind, closely and finely punctured, and with a fine median line; elytra elongate, 
much wider than the prothorax. . 
3. Antennz with the first joint long and slender, extending to the base of the head, and about as long as 
joints 2-4 united, not sinuate or emarginate on the inner side before the tip; joint 2 very little stouter 
than 3, and fully one-half longer than it; joints 3-11 elongate, subequal in length; joints 1 and 2 thickly, 
the others densely, punctured. Anterior tibia with a single spur. Anterior tarsi with the first joint 
slightly longer than the second, not dilated, concave and smooth at the base beneath. Sixth ventral 
segment feebly emarginate. 
Length 124-144 millim. (¢ 9.) 
Hab. Mexico, Chilpancingo (fH. H. Smith). 
Two males—one from Chilpancingo, the other from an unknown locality; the latter 
is contained in Mr. F. Bates’s collection. ‘This species differs from its allies in the 
very long and slender basal joint of the male antenna, this joint being unemarginate on 
