306 RHYNCHOPHORA. 
a. Prothorax gradually dilated from the apex to the acute hind angles, 
and there as wide as the elytra: upper surface usually fusco- 
variegate, sometimes uniformly cinereous . . . setosus, Boh. 
8. Prothorax obtusely dilated at the sides before the base and “obliquely 
narrowing thence to the hind angles: scales green and cinereous, 
the elytra fusco-variegate . . . . . . . virescens, sp. Nn. 
c, Prothorax angularly dilated at the sides before the base and hollowed 
thence to the sharp hind angles: scales uniformly brownish- 
cinereous above. . .. . . . oe . . + « « denticollis, sp. n. 
b'. Prothorax not or more feebly radrgined on each side at base, narrower 
than the elytra. 
d’. Prothorax gradually widened to the base, at least in ¢: upper 
surface variegate, the prothorax often fusco-bivittate on dise. . . variegatus, Boh. 
e’. Prothorax with the sides subparallel or shghly converging behind : 
upper surface variegate . . . . ‘ . oe . . marmoratus, Horn. 
b. Mesosternal protuberance short, subconical ; rostrum shallowly sulcate ; ; 
upper surface variegate. 
c'. Prothorax with the sides subparallel behind. . . +» crassipes, Sp. D. 
d', Prothorax with the sides rounded from the base . . . . . . . « rotundicollis, sp. n. 
1. Coleocerus setosus. (Tab. XIV. figg. 11, lla, ¢.) 
Colecerus setosus, Boh. in Schéuh. Gen. Cure. v. p. 928 °. 
Colecerus minutus, Sturm, in litt.*. 
Var. The scales uniformly cinereous, sometimes with a faint cupreous or greenish tinge. 
Megalostylus sulcirostris and lepidotus, Sturm, in litt.°. 
Length 4-74, breadth 13-33 millim. 
Hab. Mexico! (Sallé, ex coll. Sturm?*; Truqui; Flohr), Matamoros Izucar (Sallé, 
Hoge), Colima City, Tacambaro, Huetamo (Hége), Puebla (Sallé), Puente de Ixtla 
(Deam, in U.S. Nat. Mus.), Tepetlapa (H. H. Smith). 
This insect is more ovate than the allied forms, the sides of the prothorax (which 
are margined at the base) forming a continuous outline with those of the elytra, the 
acute hind angles of the former sometimes slightly projecting beyond the humeri. 
The upper surface in the typical form (fig. 11) is asymmetrically variegate with black 
and cinereous (or whitish) scales, the dark scales usually condensed on the disc of the 
prothorax into two strongly sinuate or curved stripes (which enclose a cruciform or 
transverse whitish patch), these markings being entirely obliterated in the cinereous 
variety. The setze (often abraded) are so short and inconspicuous that they are hardly 
visible till the insect is viewed in profile. The two specimens sent me for examination 
by Dr. Sjéstedt differ greatly in size, and the long series received from Matamoros 
varies in the same way. The immaculate variety is represented by five examples from 
Colima City, two from the Sturm collection, and one in the British Museum. 
