HETEROMERA. 493 
reflexed, the base feebly sinuate on either side, the surface densely, very irregularly punctate, the punc- 
tures much coarser and more or less confluent on the middle of the disc behind, the disc usually with an 
irregular, smooth, raised median line towards the base, and two oblique smooth spaces on either side ; 
elytra the width of, or very little wider than, the prothorax at the base in the male, broader and more 
dilated in the female, rather abruptly declivous behind, with a strongly thickened marginal carina 
extending from the obtuse (or moderately prominent) humeri nearly to the apex, and three irregular, 
feebly raised, almost smooth costa on the disc—the inner two very broad, and each formed by two anas- 
tomosing lines (which are sometimes only connected by transverse elevations), the interspaces (the sutural 
one excepted) here and there transversely wrinkled, coarsely so in some specimens, the base more or less 
obliquely sloping towards the humeri, the depressions of the surface clothed with scaly hairs; the entire 
under surface very finely, sparsely punctate, each puncture with a scaly hair; prosternum declivous 
behind, concave in the middle between the coxe ; anterior tibie with a short spur at the tip. 
Length 13-18, breadth 7-10 millim. (¢ @.) 
Hab. Mexico, Villa Lerdo in Durango, Santa Clara in Chihuahua, Chihuahua city 
(Hoge). 
Sent in abundance from Villa Lerdo. Allied to A. opaca, A. forreri, and A. manci- 
pata, but differing from all of them in various particulars. The hind angles of the 
thorax are unusually prominent, and the base of the elytra slopes more or less obliquely 
towards the humeri; the humeri are obtuse in some examples, prominent and reflexed 
in others. The elytral sculpture is difficult to describe: in some specimens the inner 
costee are each formed by two irregular raised lines, which are partly connected by 
transverse or oblique elevations ; in others (two from Chihuahua) the coste are almost 
obliterated, and replaced by irregular transverse wrinkles. 
8(s). Asida mancipata. 
Asida mancipata, Horn, Trans. Am. Ent. Soc. vii. p. 56°. 
Hab. Norra America, New Mexico !.—Mextco, Chihuahua city (Hége). 
Two specimens. 
8(c). Asida intricata. (Tab. XXII. fig. 9.) 
Broad, rather short, depressed, opaque, black ; the elytra somewhat thickly, the prothorax sparingly, clothed 
with short, appressed, scaly, yellowish-brown hairs, the head with longer hairs. Prothorax broader than 
long, very deeply emarginate at the apex, a little rounded at the sides anteriorly, gradually narrowing in 
front, slightly narrowed behind, the lateral margins strongly thickened and slightly raised, but not 
grooved within, the anterior and hind angles obtuse but very strongly produced, the latter overlapping 
the base of the elytra, the base strongly sinuate on either side and feebly so in the middle, the surface 
very shallowly, rather finely punctate, the punctures each with a scaly hair and separated by fine, raised 
lines, which towards the sides become coarser and more transverse, the disc with an interrupted smooth 
median line and two smooth spots on either side; elytra much wider than the prothorax, a little rounded 
at the sides, widest at the middle, produced at the apex, flattened on the disc, and with a thickened and 
reflexed marginal carina extending from the very prominent humeri nearly to the apex, the disc with a 
network of fine, raised, irregular, smooth, anastomosing lines apparently radiating from two longitudinal 
series, the interspaces filled with appressed short scaly hairs, the base sinuate on either side, and excavate 
within for the reception of the hind angles of the prothorax; beneath slightly shining, very sparsely, 
finely punctate, each puncture with a scaly hair; prosternum very broadly, subhorizontally produced, 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 1, November 1892. 35S 
