370 PHYTOPHAGA. 



3. Phyllotreta lewisi? 



Orchestris lewisii, Crotch, Proc. Acad. Phil. 1873, p. 66 \ 



Eab. Noeth Ameeica 1 . — Mexico, Yucatan (coll. Baly); Guatemala (Pilate, coll. 

 Baly). 



There are two specimens of a Phyllotreta contained in Mr. Baly's collection, in which 

 the entire upper surface is dark blue and finely punctured ; the first four joints of the 

 antenna?, and the base of the tibiae as well as the tarsi, fulvous— these characters 

 agreeing entirely with the short and insuincient description given by Crotch of his 

 P. lewisii, to which I refer these insects at present. The size is one line ; the head 

 very finely punctured ; the sides of the thorax are but very slightly rounded, and the 

 surface shows also traces of a fine transverse groove near the base ; the general shape 

 and other characters are those of a species of Phyllotreta. 



4. Phyllotreta abdominalis. (Tab. XXL fig. 12.) 



Black ; basal joints of the antennas, legs, and abdomen flavous ; head, thorax, and scutellum black ; elytra 

 metallic blue. 



Length 1 line. 



Head impunctate ; eyes large ; frontal tubercles broad and rather distinct ; antennae more than half the length 

 of the body, the second joint thickened and scarcely shorter than the two following joints, the four or five 

 lower joints flavous, the rest piceous ; thorax nearly twice as broad as long, black, impunctate, the sides 

 rounded and narrowly margined, the posterior margin with a slight depression at the middle in front of 

 the scutellum, a very slight transverse depression may also be seen at the sides ; elytra wider than the 

 thorax at the base, gradually and slightly dilated below the middle, without any basal depression, the 

 surface almost impunctate, and with only a few rows of extremely finely impressed punctures near the 

 suture (only visible under a strong lens), metallic blue ; legs and abdomen flavous ; posterior femora with 

 a black or piceous spot at the apex ; first joint of the posterior tarsi as long as the three following joints 

 united. 



Eab. Panama, Volcan de Chiriqui (Champion). 



Principally distinguished from its allies by the flavous legs and abdomen and the 

 black thorax. 



5. Phyllotreta nigricollis. (Tab. XXI. fig. 15.) 



Below piceous ; head and thorax black, impunctate ; elytra bluish-black, very finely punctate-striate. 



Length 1| line. 



Head impunctate ; frontal tubercles very indistinct ; carina rather distinctly raised ; labrum piceous ; antennae 

 more than half the length of the body, the second and third joints very short and of equal length, the 

 following four joints somewhat triangularly widened, the terminal one slender and elongate, the underside 

 of the first and the two following joints is obscure fulvous, the rest black ; thorax less than twice as 

 broad as long, black, the sides scarcely rounded and distinctly narrowed from the base to the apex, the 

 angles not prominent, the anterior ones furnished with a single hair, the surface impunctate or (seen under 

 a very strong lens) exceedingly finely punctured ; scutellum broadly trigonate ; elytra slightly narrowed 

 towards the apex, the portion below the base and near the suture slightly depressed longitudinally, each 

 elytron with about ten rows of finely impressed punctures, the punctures placed in single and regular 

 lines and visible, but less distinctly, to the apex ; the colour is nearly black, with a slight bluish tint ; 



