18 . PHYTOPHAGA: 
of the body; joints cylindrical, the first short, about three fourths the length of the 
second, the third nearly as long as the preceding two united, fourth and fifth equal, 
each three fourths the length of the third. Thorax nearly one third broader than long; 
sides straight and parallel, abruptly rounded at the apex, hinder angle very acute, the 
anterior one moderately produced, obtuse ; upper surface coarsely but distantly punctured 
on the sides, the punctures closer and finer on the disc; an ill-defined longitudinal space 
in the medial line nearly free from punctures; medial disc covered with a broad wedge- 
shaped nigro-piceous vitta, which extends from the basal to the apical margin. Elytra 
broader than the thorax, oblong; lateral margin dilated, slightly reflexed ; apical margin 
rounded, conjointly subangulate, emarginate at the sutural angle; upper surface convex 
on the sides, slightly flattened along the suture, distinctly and regularly punctate-striate, 
the puncturing nearly obsolete on the hinder disc, but again stronger and more distinct 
near the apex. 
24. Cephaloleia chevrolati. 
Cephaloleia chevrolati, Baly, Cat. Hispide, p. 61°. 
Hab. Mexico, Yucatan ! (coll. Chevrolat). 
This species, described from a single specimen in M. Chevrolat’s collection, now not 
accessible to me, is closely allied to C. lateralis and C. elegantula. 
25. Cephaloleia instabilis. (Tab. I. figg. 23, 24.) 
Elongata ; subtus nigra, nitida, thorace fulvo, femoribus tibiisque anticis subtus pallide piceis ; supra pallide 
fulvo-picea, antennis verticisque plagis duabus magnis, superficiem fere amplectentibus, nigris; thorace 
subquadrato, utrinque ad latus excavato, sparse foveolato-punctato, disco levi, vitta nigro-picea ornato; 
scutello piceo ; elytris opacis, dorso deplanatis, leviter sed distincte punctato-striatis, nigris, ante medium 
fulvo-piceis. 
Mas. Abdominis segmento anali apice obtuso, medio leviter sinuato. 
Fem. Abdominis segmento anali apice obuse truncato. 
Var. A. Elytris nigris, utrinque vitta lata humerali, a basi ad medium extensa fulva. 
Var. B. Elytris fulvis, pone medium nigris. 
Var. C. Elytris totis fulvis. 
Long. 33-4 lin. 
Hab. Guatemaua, Chiacam, ‘Cahabon, Lanquin, and Cubilguitz in Vera Paz (Cham- 
pion) ; Panama, Bugaba 800 to 1500 feet (Champion). 
Vertex and front coarsely punctured, black, a narrow medial line alone piceo-fulvous. 
Antenne entirely black ; four lower joints compressed, the basal one clavate, the following 
three more or less trigonate and nearly equal in length in the male, third joint rather 
longer in the female. Thorax scarcely broader than long; sides straight and parallel, 
anterior angle scarcely produced, obtuse, the hinder one acute; upper surface broadly 
excavated on the sides, the excavation extending the whole length of the thorax, 
sparingly impressed with round irregular punctures; disc nearly impunctate, medial 
