282 MR. A. MURRAY'S MONOGRAPH OF THE FAMILY OF NITIDULARLE. 
punctulate, black. Elytra wider and a half longer than the thorax, finely punctate, 
black, with a large triangular luteous patch, common to both, extending from the 
shoulders to the interior angle of the apex. Abdomen very faintly punctate, piceous. 
Breast black. Legs testaceous. 
From specimens sent to me by Dr. Leconte, under the name C. truncatus of Randall, 
Iam enabled to identify the species described by that entomologist under that name 
with this species; but I do not think his description sufficiently clear to warrant me in 
substituting his name for the better-known one of Erichson. Ihave placed in the British 
Museum one of Erichson’s types which I received from the Berlin Museum through the 
kindness of Professors Peters and Gerstácker. 
Common throughout North America from Lake Superior to Mexico. 
44. COLASTUS TRIANGULARIS. 
Valde affinis C. infimo; differt thorace antice angustiore. Long. 1-1} lin., lat. 3 lin. 
Habitat in Brasilia. 
Very closely allied to C. infimus—perhaps only a variety. The chief difference is that 
the sides of the thorax slope more rapidly towards the front. In other respects I can see 
little difference. Like C. infimus it varies in colour, having sometimes the lighter portions 
testaceous and at other times pale piceous, the arrangement of the colours, however, 
continuing the same. 
From Brazil. 
45. COLASTUS LIMBATUS. 
Leconte, in Proc. Acad. Nat. Sci. Philad. March 1858, 62 (1858). 
Depressus, ovalis, niger, griseo pubescens; thorace confertissime subtilius punctato, an- 
trorsum angustato, margine angusto angulisque posticis indeterminate testaceis; 
elytris confertim subtilius punctatis, piceo-testaceis, limbo omni sequali suturaque 
nigris; abdomine subtilissime punctulato; pedibus antennisque testaceis, his clava 
paulo infuscata. Long. 1 lin., lat. 2 lin. 
Habitat apud flumen Colorado prope flumen Gilæ in California. 
Depressed, oval, blackish, griseo-pubescent. Head finely punctulate. Antennze testa- 
ceous, the club fuscous. Thorax finely and very thickly punctate, narrowest in front, with 
the margins and posterior angles narrowly and indeterminately testaceous. Scutellum 
large, very finely punctate, the margin depressed. Elytra very thickly and finely punc- 
tate, piceo-testaceous, with the margin all round, base, sides, apex, and suture gradually 
blackish, the suture less distinctly so than the rest; the apex of each elytron slightly 
obliquely truncate. Abdomen very finely punctulate. Legs testaceous. 
Through the kindness of Dr. Leconte I have seen this species, and agree with him 
in thinking it distinct from, although it is nearly allied to, C. infimus. It is of the same 
size and texture; but the thorax is more narrowed in front, the colour is muddy piceous 
black, and the elytra have the disk instead of the scutellar region paler. 
From the River Colorado, near the Gila, in California. 
