898 HETEROMERA. 
g. Antenne with the basal joint nearly as long as joints 2-5 united, slightly flattened, becoming stouter 
outwardly, sinuous in its apical half, and excavate on the inner side beyond the middle, somewhat thickly 
punctured ; joint 2 concave beneath, not quite twice the length of, and only a little stouter than, 3; joints 
3-11 slender, becoming gradually longer and thinner, 3 distinctly shorter than 4, 5-10 subequal in length. 
Anterior tibie with a single spur. Anterior tarsi with the basal joint scarcely dilated, concave beneath, 
as long as the second. Sixth ventral segment feebly emarginate. 
Length 124, breadth 33 millim. (<¢.) 
Hab. Nortu America, Arizona !.—Mexico, Ventanas in Durango (Hége). 
Dr. Horn’s description !, taken from a single male, from Arizona, nearly agrees with 
a specimen of the same sex from Durango. The Durango male has the basal joint of 
the antenne sinuous in its apical half, and excavate on the inner side beyond the 
middle: the Arizona male is described! as having “the basal joint arcuate, gradually 
wider from base, not contorted at apex.” As there are some other slight discrepancies, 
I have thought it advisable to give a description of the Durango insect. 
6. Macrobasis disparilis. (Tab. XVIII. figg. 18,3; 184, antenna, g .) 
Elongate, narrow, parallel, black; the head, the flanks, the basal and apical margins, and sometimes a line on 
the middle of the disc of the prothorax, the scutellum, the suture, the apical and lateral margins of 
the elytra very narrowly, and a small spot at the middle of the base of each, the under surface, and legs, 
cinereo-pubescent, the rest of the pubescence black or blackish-brown, sparse, and fine. Head moderately 
large, closely and finely punctured, finely canaliculate in the middle, the epistoma separated from the front 
by a deep groove; antenne slender, setaceous, black ; prothorax narrower than the head, about as long as 
broad, the sides rounded anteriorly, parallel behind, and slightly widened at the base, the disc triangularly 
depressed in the middle behind and with a well-marked median groove, the surface closely and finely 
punctured; elytra very long and parallel, wider than the head, sparsely, minutely punctate; beneath 
closely punctured; legs black. 
3. Antenne with the basal joint exceedingly elongate, nearly reaching the base of the prothorax, and about 
equalling joints 3-9 united, flattened and moderately stout, gradually thickening outwardly, and abruptly 
sinuous in its apical third ; the second joint equally stout, flattened-cylindrical, slightly curved, as long as 
joints 8-5 united, and not half the length of 1; joints 3-11 slender, moderately elongate, gradually 
becoming thinner outwardly, subequal in length; joints 1 and 2 very sparsely, the others densely 
punctured. Maxillary palpi flavous. Anterior tibie with a single spur, sinuous, Anterior tarsi with 
the first joint partly flavous, flattened and sinuous, much shorter than the second, above and beneath 
shining and almost glabrous, concave on the underside and at the base on the upperside. Sixth ventral 
segment feebly emarginate. 
9. Antenne slender from the base; joint 1 not equalling 2 and 3 united, 2 one-half longer than 3, 3-11 
formed as in the male. Maxillary palpi black. Anterior tarsi with the first joint normal, longer than 
the second. 
Length 10-12, breadth 23-3 millim. (¢ Q.) 
Hab. Mexico (Sallé, ex coll. Sturm), Puebla (Sal/é), Omilteme in Guerrero 8000 feet 
(H. H. Smith). 
Seven examples. In this species the basal joint of the male antenna is so much 
elongated that it nearly reaches the base of the thorax. M. disparilis is allied to 
M. diversicornis and M. beckeri. Inthe colour and arrangement of the pubescence it 
is extremely like Epicauta cinctipennis, Chevr., with which species it was confounded 
in the Sallé collection. 
