HETEROMERA. 501 
@ 
24 (p). Asida unicostata, (Tab. XXII. fig. 19.) 
Elongate-oval, black, opaque, very sparsely clothed with fine, appressed (easily abraded), yellowish scaly 
hairs. Head coarsely, sparsely punctate, smoother between the eyes; prothorax broader than long, 
rounded at the sides, moderately narrowed in front, and a little narrowed behind, the dise transversely 
convex and almost smooth, the lateral margins crenulate, broadly expanded, thin, and somewhat deeply 
grooved within, the anterior angles triangularly produced, the hind angles rectangular, the base trisinuate 
and deeply, transversely depressed in the middle, the median lobe very broad and produced on either side 
behind ; elytra moderately elongate, the width of the prothorax at the base, gradually widened to beyond 
the middle, and with the apex produced, subtruncate at the base, with a sharply raised marginal carina 
extending from the subdentiform humeri nearly to the apex, and a strongly raised shorter and stouter 
median ridge, the space between the median carina and the suture smooth and flat, that between it and 
the marginal carina sloping, more distinctly pubescent, and with two rows of scattered, smooth, rather 
coarse granular elevations—one, median, placed posteriorly upon a faint carina, the other more irregular, 
close to the margin, the epipleurse towards the apex separated from the flanks by a sharp carina, a short 
row of granular elevations below the apical portion of the marginal carina; the ventral surface opaque, 
finely scabrous, and with some widely scattered fine punctures; prosternum rounded and declivous behind 
not, produced ; anterior tibiz with a sharp tooth at the apex. 
Length 19, breadth 9 millim. 
Hab. Mexico, Venta de Zopilote in Guerrero 2800 feet (H. H. Smith). 
One specimen only of this curious species has been received. 
25 (a). Asida marginata. 
Pelecyphorus marginatus, Lec. Ann. Lye. New York, v. p. 128°. 
Asida marginata, Horn, Rev. Ten. of Am. north of Mexico, p. 288°. 
Pelecyphorus rimatus, Lec. Proc. Acad. Phil. vii. p. 223°. 
Philolithus rimatus, Lacord. Gen. Col. v. p. 158, nota’. 
Hab. Norrn America!, desert regions bordering the Gila River of Arizona?! 2, 
Mexican boundary *.—Mexico, Northern Sonora (Morrison), Paso del Norte (Hoge). 
Asida difficilis (p. 61). 
To the Mexican localities given, add :--Tula in Hidalgo (/Hége). 
Sent in abundance by Herr Hoge. A. difficilis seems to be perfectly distinct from 
A. pubescens. The anterior angles of the thorax are very acute. 
' Asida costata (p. 62). | 
Asida costata (Sol.), huj. op. p. 62 (nec Fisch., 1843). 
To the locality Mexico, add :—Tenango del Valle (Richardson), Toluca, Jalapa 
(Hoge). 
Sent in plenty by Mr. Richardson. In a specimen received from Herr Hége, 
labelled (perhaps incorrectly) as from Jalapa, the elytral coste are less raised than 
usual. 
pon CENTR.-AMER., Coleopt., Vol. IV. Pt. 1, November 1892. 3TT 
