822 SUPPLEMENT, 
A still greater local variation in sculpture is presented by this species. Ventanas 
specimens are rendered subopaque by the close and fine vermiculate punctuation of the 
elytra, the thorax being much more coarsely but also densely punctured. Alamos 
examples have a nearly smooth thorax. 
DELTASPIS (p. 76). 
This genus belongs to Leconte’s group Tyloses, the mandibles being broad and 
notched at the apex. 
Deltaspis auromarginata (p. 77). 
Var. D. cyanipes, Klug, MS, Elytris marginibus concoloribus. =D. auromarginata (partim), Lacordaire, Gen. 
Col. ix. p. 172. 
To the locality given, add :—Mexico, San Carlos (Saiié). 
All the examples I have seen of this species belong to the var. D. cyanipes (Klug, 
MS.), which, according to Lacordaire, is a variety of D. auromarginata. 
Deltaspis rubriventris (p. 77). 
To the locality given, add:—Muxico, Ventanas (Forrer). 
Deltaspis nigripennis (p. 77). 
? Muscidora tricolor, Thomson, Syst. Ceramb. p. 202. 
To the locality Mexico, add :—Almolonga (Hége), Alamos (Buchan-Hepburn). 
8. Antennis quam corpus fere duplo longioribus, articulis 3°-4" haud sulcatis. 
The thorax is in most examples rounded on the sides, without trace of lateral 
tubercle, in others it has a lateral tubercle, as described ; it is bright blood-red in colour, 
with the anterior and posterior margins black. The apex of the elytra varies also in 
a singular manner, being either obtusely rounded or flexuous-truncate, with the ex- 
terior angle dentiform. 
As mentioned in the description, the surface is slightly shining, and the elytra bluish 
black. ‘The punctuation is fine on the elytra, but each puncture is separate from its 
neighbour; on the thorax the punctures are larger, deep, and circular, and mostly 
widely spaced. 
The species has a close general resemblance to Batyle ignicollis, Say, but is well 
distinguished by its generic characters, the mandibles in Batyle being acute and simple 
at the apex, and the hind femora and tarsi elongated. It agrees very well with 
Thomson’s description of Muscidora tricolor except in the important character “ frons 
lateraliter subarmata;” there being no trace of any prominence on the forehead in any 
of our numerous examples of D. nigripennis, I am obliged to infer that Thomson’s 
insect is a species belonging to some genus of this numerous group unknown to me. 
