HHETEROMERA. 499 
the reception of the hind angles of the prothorax) to about one-third from the apex, the base carinate and 
quite straight, the apical portion somewhat abruptly declivous, the entire surface, including the flanks, 
sparsely, coarsely punctate ; beneath sparsely, coarsely punctured, the ventral surface finely scabrous and 
with scattered fine punctures, which towards the sides become much coarser; prosternum very broad, 
declivous behind; anterior tibise denticulate on their outer edge, with a long, sharp, stout tooth at the 
apex. 
Length 20, breadth 11 millim. 
Hab. Mexico, Saltillo in Coahuila (Hége). 
One example. This species somewhat resembles A. latissima, but is shorter and 
has a very differently formed thorax. The thorax and elytra are very broadly truncate 
at the base; the humeri are strongly raised but obtuse, and excavate within for the 
reception of the hind angles of the thorax. 
23. Asida collaris. 
Asida marginicollis, huj. op. p. 60 (nec Rosenh.). 
To the Mexican locality given, add:—Lagos, Aguas Calientes city (Hége). 
The three specimens described are all females. The male is narrower and more 
parallel; it greatly resembles some of the Mexican species of Calosoma. A. lata, 
females only of which are known, is perhaps an extreme form of A. collaris. 
23 (a). Asida furcata. (Tab. XXII. fig. 15.) 
Elongate-oval, brownish-black, opaque, the head and prothorax with a few very short, fine, decumbent hairs, 
the elytra glabrous. Head sparsely, rather finely punctate; prothorax broader than long, a little rounded 
at the sides, narrowed in front and behind, scarcely narrower at the apex than at the base, the disc trans- 
versely convex, declivous behind, and sparsely, very finely punctate, the interspaces densely, exceedingly 
minutely punctate, the lateral margins slightly crenulate, expanded, reflexed, and grooved and coarsely 
punctured within, the anterior angles acutely produced in front, the hind angles subrectangular, the base 
feebly trisinuate, the apex crenulate and with some coarsish punctures; elytra the width of the prothorax 
at the base, a little rounded at the sides, rapidly widening to beyond the middle, with the apex somewhat 
produced, slightly emarginate at the base, with an acutely raised marginal ridge extending from the 
subacute humeri almost to the apex, an acute carina extending inwards from this at about one-third from 
the base, and a curved, sharp, median carina extending from the base downwards and parallel with the 
second posteriorly, the rest of the surface with scattered, irregularly arranged, fine, conical elevations, the 
space between the median carina and the suture flat, the epipleuree not separated from the flanks by 
a sharp carina at the apex, the flanks sparsely, rather coarsely punctate ; the ventral surface densely, 
exceedingly minutely punctate, with scattered fine punctures, the flanks of the prothorax with some 
rather coarse muricate impressions; prosternum broadly longitudinally excavate between the coxe, 
declivous behind ; anterior tibia with a short tooth at the tip. 
Length 15, breadth 7$ millim. 
Hab. Mexico, Villa Lerdo in Durango (Hoge). 
One example. Probably an ally of A. bifurca, Lec., from Cape San Lucas. The 
only Mexican species approaching it is A. unicostata. The median carina on the 
elytra is curved inwards towards the suture behind and there parallel with the branch 
