ADDENDA. 345 
PIASUS. (To precede the genus Lactica, p. 270.) 
Body ovate; antenne robust, the basal joints swollen (3); thorax transverse, the anterior angles oblique, 
the base with a deep sinuate transverse groove bounded at the sides by a longitudinal impression ; elytra 
irregularly punctured, their epipleure very broad, continued to the apex; tibie robust, sulcate, the 
posterior pair mucronate ; claws appendiculate ; prosternum narrowly elongate ; anterior coxal cavities 
open. 
This genus has most of the characters of Lactica, but differs from it in the form of 
the frontal elevations and carina, and in the shape of the thoracic sulcus; the antenne 
in the male are also very pubescent and have their basal joints swollen. 
1. Piasus fulvus. (Tab. XLIII. fig. 25, 2.) 
Fulvous, the antennx black (the three basal joints excepted); thorax impunctate; elytra extremely finely 
and sparingly punctured, the basal portion convex. 
3. The antenne fimbriate, their basal joints strongly thickened ; the first joint of the tarsi dilated. 
@. Antenne more slender; the elytra with three strongly raised lateral coste. 
Length 13-1? lines. 
3. Head impunctate, the eyes rather narrow and oblique, the frontal elevations somewhat swollen, scarcely 
divided, the clypeus strongly raised, deflexed in front; palpi slender, scarcely thickened, the terminal joint 
very short ; antennz rather narrowly separated at their point of insertion, extending to a little beyond the 
middle of the elytra, black, the lower three joints fulvous, the third and fourth joints equal, these as well 
as the basal one thickened towards their apex, all the joints furnished with a fringe of long hairs on 
their lower edge ; thorax twice as broad as long, the sides rounded at the middle, the anterior angles 
oblique, the posterior ones acute, all furnished with a single seta, the base with a deep transverse sulcus 
bounded at the sides by a longitudinal groove ; scutellum broad; elytra ovate, the basal portion slightly 
raised, the surface very sparingly and finely punctured. 
Hab. Mexico, Acapulco in Guerrero (Hoge). 
In the females the elytra have three strongly raised coste, of which the external 
two are joined below the shoulder. Numerous examples. 
LACTICA (p. 270, and Suppl. p. 258). 
40. Lactica vittatipennis. (Tab. XLIII. fig. 22.) 
Piceous, the lower part of the head, the thorax, and legs testaceous; elytra finely punctured, black, with a 
longitudinal yellowish stripe near the suture extending from the buse to near the apex. 
Length 13 line. 
Head black on the vertex, the latter impunctate, opaque, with an obscure central ridge, the eyes very large, 
the lower portion of the face and the clypeus testaceous; antenne extending to beyond the middle of the 
elytra, black, pubescent, the fourth joint longer than the third; thorax very short and transverse, nearly 
three times as broad as long, the sides straight, the anterior angles obliquely thickened, the surface 
impunctate, with a deep transverse sulcus behind, bounded on either side by an equally deep longitudinal 
groove; scutellum black ; elytra parallel, finely and rather closely punctured, black, with a longitudinal 
yellowish stripe near the suture, this stripe abbreviated and widened at a short distance from the apex; 
legs testaceous, the apex of the tibiee and the tarsi more or less fuscous or black. 
Hab. GuateMata, Panima in Vera Paz (Champion); Panama, Volcan de Chiriqui 
(Champion). 
This insect resembles greatly in coloration certain species of Phyllotreta, Systena, 
and Pseudoepttriz. 
BIOL. CENTR.-AMER., Coleopt., Vol. VI. Pt. 1, Suppl., April 1892. 2y 
