STSTENA. 329 



Head impunetate ; frontal tubercles narrow and transverse ; third and fourth joints of the antennae equal ; 

 thorax subquadrate, the sides rounded and rather distinctly narrowed at the base ; surface rather closely 

 covered with round and distinct punctures, black, the basilar sulcation very slightly indicated at the sides 

 only, and almost entirely obsolete in the middle ; scutellum black ; elytra parallel, much wider at the 

 base than the thorax, the base distinctly raised, the surface more closely and rather more strongly punc- 

 tured than that of the thorax, and the punctuation here and there arranged in irregular double rows ; 

 underside and legs black, the anterior femora sometimes piceous or fulvous. 



Eab. Guatemala, Quezaltenango (Champion). 



The shape of the thorax in this species is less transverse than usual, and the basilar 

 groove less clearly denned. The closed anterior coxal cavities and other structural 

 characters are, however, the same as in Systena. S. metallica may be known from the 

 other species of the genus by its metallic elytra and black punctured thorax, in 

 connexion with its small size. Twenty-five specimens were obtained. 



16. Systena viridipennis. (Tab. XX. fig. 3.) 



Below black ; basal joints of the antenna?, thorax, and legs fulvous ; head and elytra metallic green, the 

 latter closely punctured. 



Var. Thorax blackish green ; posterior femora black. 



Length If line. 



Head rather finely and remotely punctured, metallic green ; lower part of face testaceous ; frontal tubercles 

 scarcely visible ; antennae more than half the length of the body, the four basal joints testaceous, the rest 

 fuscous, third and fourth joints equal; thorax transverse, fulvous, the basal groove rather distinct and 

 sinuate, surface punctured like the head, the punctures, however, rather larger ; scutellum black ; elytra 

 metallic green, closely rugose-punctate ; legs fulvous ; underside black. 



Eab. Mexico, La Parada (coll. Salle). 



Of this very distinct species two specimens are known to me ; they do not differ in 

 structural characters, but only in regard to colour. The specimen which I have 

 noticed as a variety has the thorax nearly black, the anterior femora spotted with 

 black, and the posterior ones entirely of that colour ; this species is very distinct on 

 account of the metallic green elytra. 



17. Systena regtilaris. (Tab. XX. fig. 14.) 



Testaceous ; base of the head and two spots on the thorax obscure greenish piceous ; elytra closely punctate- 

 striate, testaceous, the base more or less distinctly metallic green. 



Length 1 line. 



Head impunetate; frontal tubercles transverse, narrow; antennae with the third and fourth joints equal, 

 terminal joints more or less fuscous ; thorax one half broader than long, the sides rounded and widened 

 before the middle, the transverse sulcation moderately distinct and more plainly marked at the sides, the 

 surface finely punctured, testaceous, the sides with a broad longitudinal piceous spot ; elytra very little 

 widened behind, depressed towards the somewhat raised base, the surface closely and distinctly but not 

 very regularly punctate-striate, the punctures distinct to the apex ; at the base and surrounding the 

 scutellum is a more or less distinct metallic greenish spot, the rest of the surface testaceous with a slight 

 metallic gloss ; underside and legs testaceous. 



Hab. Panama, Volcan de Chiriqui (Champion). 



Although the elytra are not confusely punctured as in all the other species of 

 biol. cente.-amee., Coleopt., Vol. VI. Pt. 1, October 1884. 2u 



