330 PHYTOPHAGA. 



System known to me, all the other characters peculiar to the genus are present ; the 

 punctuation of the elytra alone does not seem sufficient to me to justify placing the 

 insect in another genus. Clark has also described two species in which the elytra are 

 punctate striate. Six specimens are before me. 



18. Systena coxalis. (Tab. XX. fig. 19.) 



Black; base of the antenna* and tibiae testaceous ; thorax impunctate; elytra dark blue, nearly impunctate 

 and slightly wrinkled. 



Length 1 line. . 



Head impunctate, black ; the frontal tubercles narrow and transyerse, and limited behind by a transverse 

 groove ; antenna half the length of the body, the three basal joints and the base of the fourth testaceous, 

 the rest black ; third and fourth joints equal in length ; thorax one half broader than long, of equal 

 width, the sides rounded and narrowly margined, the basilar sulcation distinct and extending to the sides, 

 the surface impunctate, black, the anterior angles obtusely rounded ; scutellum black ; elytra slightly 

 widened towards the apex, with a transverse depression near the base, the base with a few fine punctures, 

 the general surface somewhat uneven and transversely wrinkled ; underside and legs black ; the extreme 

 base of the femora and tibiae testaceous. 



Eab. Guatemala, Duefias (Champion). 



The thorax in this species is rather different in shape from most of the allied forms, 

 being even in width, finely margined, and with rounded sides. In the absence of any 

 other characters, however, and on account of the closed coxal cavities, I have preferred 

 to leave this species in Systena. 



19. Systena longicornis. (Tab. XX. fig. 16.) 



Below black; antennae long, their basal joints, with the head, thorax, and legs, fulvous; elytra metallic 

 greenish aeneous, closely punctured. 



Length 1 line. _ 



Head somewhat rugosely punctured near the eyes ; frontal tubercles small but distinct ; palpi fulvous ; 

 antenna? nearly as long as the body, the four or five basal joints fulvous, the rest black, the third and 

 fourth joints elongate and equal in length ; thorax transverse, nearly twice as broad as long, the sides 

 nearly straight, very slightly rounded at the middle, the basilar sulcation only indicated at the sides by a 

 shallow impression; scutellum broad, triangular, black; elytra a little widened behind, transversely 

 depressed near the base, of a greenish brassy metallic colour, the surface closely punctured, the punctures 

 more distinct at the base than near the apex. 



Eab. Guatemala, Chiacam (Champion). 



The shape of the thorax and the length of the antennas in this species make it 

 doubtful whether the present genus is the proper place for it; but rather than 

 augment the numerous genera of Halticinse I have preferred to include the species in 

 Systena, on account of the closed coxal cavities and the indication of a thoracic groove. 

 Five specimens are before me. 



20. Systena scutellaris. 



Testaceous ; thorax minutely punctured ; elytra closely punctate, a narrow sutural and sublateral stripe and 



a small spot near the scutellum black ; outer edge of the tibiae piceous. 

 Length 2| lines. 



