MR. A. MURRAY'S MONOGRAPH OF THE FAMILY OF NITIDULARLE. 259 
Antennze fuscous, with the base testaceous. Head glabrous, densely and deeply punctate, 
and slightly impressed on each side in front. Thorax dilated in the males, slightly rounded 
on the sides, the basal margin somewhat depressed on each side, sparingly punctate, 
glabrous, with the lateral margin ciliated. Scutellum rounded, glabrous, sparingly 
punctate at the base. Elytra a half longer than the thorax, subglabrous, rather closely 
and regularly punctate in rows, black from the apex to beyond the middle. Abdomen 
slightly pubescent, rather faintly punctate. The anterior tibie are distorted more at 
right angles than in C. ruptus (see Plate XXXIV. fig. 1 c*). 
Very nearly allied to C. ruptus, but may be distinguished by the almost entire absence 
of pubescence on the head, thorax, and elytra, by its darker colour and the more extended 
space of black on the elytra, and by its being rather less deeply punctate. The thorax 
continues nearly straight forward for some distance in front of the posterior angles before 
it rounds-in towards the anterior angles. 
From Mexico. Erichson gives Carthagena, in Columbia, as a locality for this species, 
on the authority of Dejean ; but an examination of Dejean’s collection shows that, of the 
specimens standing in it under this name, those from Carthagena are C. ruptus, and those 
from Mexico are partly of this species and partly of the next, C. scutellaris. 
3. COLASTUS SCUTELLARIS. 
C. postico valde affinis, paulo elongatior, minus et levius punctatus; capite et thorace 
piceo-nigris ; elytris nigris, basi circa scutellum anguste transversim rufo-castanea ; 
scutello nigro-piceo vel piceo-castaneo ; cseteris rufis. Long. 13-2 lin., lat. 1 lin. 
Variat colore plus minusve saturato. 
Habitat in Mexico. 
Very nearly allied to C. posticus; but it is larger, more elongate, more glabrous and 
shining, and less deeply and less closely punctate; the thorax is rounded on the edges 
more gradually. In other respects the characters are nearly the same, with the exception 
of the colour, which on the head, thorax, and scutellum is black, piceous black, or dark 
chestnut, instead of bright red. The elytra too have the black portion much more ex- 
tended, leaving usually only a small, narrow, short basal transverse line (sometimes only 
a small red spot) on each side of the scutellum. The colour varies also a good deal in 
the intensity of the black and red on the different parts of the body. The anterior tibie 
nearly as in C. posticus (see Plate XXXIV. fig. 1 c***). 
From Mexico. 
4. COLASTUS ABDOMINALIS. 
Erichs. in Germ. Zeitschr. iv. 241 (1843). 
Subdepressus, piceus, abdomine pedibusque rufis. Long. 12 lin. 
Habitat in Brasilia. ; 
Subdepressed, oblong, somewhat shining, sparingly fulvo-pubescent. Antennz testa- 
ceous, the club ferruginous. Head deeply punctate, rufo-piceous. Thorax nigro-piceous, 
truncate at the base, much dilated in the males, gently rounded on the sides, punctate 
