ae sty wee Rae : Gx 
SOUTH AMERICAN EUMOLPIDS. 191 
_ bronze colour, the latter predominating on the head and thorax, the 
_ former more in evidence on the elytra; all the margins more or less 
distinctly cyaneous ; an ill-defined but at the same time noticeable 
wheal or ridge from the shoulder diagonally to the apex, and espect- 
ally appearing just behind the middle of the elytra; entire upper 
surface thickly punctate, mostly confluent, forming transverse 
ruge. . 
"Types, two ¢, two ¢, Cochabamba, Boliv. (Germ.). 
Length, 3 mm. 
Head thickly punctate, with a well-marked depression and 
longitudinal groove ; antenne rufous, last joints partly darkened ; 
thorax slightly collared, thickly and evenly punctate, with a few 
smooth areas. Sides angulate back of the middle. Elytra only 
slightly depressed within the shoulder, densely geminate, punctate 
in the dise, confluent and transversely rugose at base and sides, 
and deeply striate punctate at the apex ; the diagonal wheal forms 
a somewhat smooth, narrow space, the rear end of which becomes 
the third interspace. The elytra of the ? area little more costate 
as to the intervals, but the diagonal is about the same in. the 
sexes ; the apices of the tibia and tarsi are more or less fuscous. 
Related by its shape to foveolata, Lef. . 
Colaspis bidenticollis, sp. nov. 
Very small; short and stout. Metallic, cyaneous green, shining ; 
labrum, antennz and legs flavous; thorax thickly and finely 
punctured, sides bidendate at and before the middle; elytra obso- 
letely transversely depressed, very finely, seriately, semi-geminately 
punctate, costate and lineate, punctured at the apex; surface semi- 
alutaceous. 
Type, ¢, Rio Tucuman, Argentina (Bruch) (second Jac. Coll.). 
Length, 2°5 mm. 
The size of a small C. pusilla, Lef., head wide, front almost 
flat, thickly evenly punctate, thorax feebly impressed either side 
back of the middle ; form quadrate, not much narrowed in front ; 
the apex of the elytra has a rather noticeable depression which 
produces a semi-tubercle effect. The antennez reach just below 
the shoulder and have the last five joints more or less thickened 
(like Nodonota) ; the legs also seem thickened and the prosternum 
is flattened. As Mr. Jacoby remarks in his description of 
Alethaxius angulicollis (‘ Trans. Ent. Soc.,’ 1900, p. 490), this and 
the two following species are forms for which it is difficult to 
find the proper place, and do not quite agree either with Colaspis 
or Alethaxius. 
Colaspis denticollis, sp. nov. 
Very small, stout. Body below eneous bronze; above, head, 
thorax and scutellum cyaneous blue; elytra violet purple, very 
