SYSTENA. 337 



eighth joints black, the rest pale testaceous ; thorax more than twice as broad as long, the sides narrowed 

 at the base, distinctly widened and rounded before the middle, where a kind of broad angle is formed, the 

 surface impunetate, obsoletely grooved near the base on either side ; elytra rather flattened, very slightly 

 widened near the apex, with a very obsolete depression near the base, the disc finely and rather indistinctly 

 punctate-striate, the interstices everywhere closely punctured ; immediately below the base a rounded dark 

 brown spot is placed, and another of a more oblique shape is situated below the middle of each elytron ; 

 posterior femora moderately thickened, their tibiae with a short spine ; prosternum distinct. 



Sab. Guatemala, Panima (Champion). 



I have placed this species in Systena as it possesses all the characters of that 

 genus with the exception of the shape of the thorax, which is much more trans- 

 verse than is the case in the allied species. Prasona balyi, Harold, seems to be another 

 closely allied species ; in the latter, as well as in 8. laticollis, the elytra are furnished 

 with some few stiff hairs (not mentioned in my description), and the punctures are 

 partly arranged in striae. 



35. Systena marmorata. 



Fulvous ; head distinctly, thorax finely, punctured ; elytra punctate-striate, depressed below the base, the latter 

 and two sublateral obscure spots testaceous, a spot below the middle near the lateral margin obscure 

 piceous. 



Length 1 line. 



Sab. Panama, Volcan de Chiriqui (Champion). 



Although the elytra in this species are punctate-striate, there is no other difference 

 in structure to be found to justify its separation from the present genus ; the insect 

 shows, however, enough characteristic peculiarities to distinguish it from any of its allies. 

 The head is distinctly punctured and has a well-impressed fovea between the antennae ; 

 the latter are slender, rather long, and of usual structure, the third and fourth joints 

 being equal in length ; the thorax is finely and rather closely punctured and the basilar 

 groove very distinct ; the elytra have a well-marked depression below the base, giving 

 the latter a raised appearance ; their punctuation is fine but distinct and placed in 

 regular rows ; the coloration is rather peculiar, the fulvous colour being relieved by a 

 testaceous obscure spot at the base, a spot on the middle, and another one below the 

 latter close to the lateral margin ; between the last two spots another obscure piceous 

 spot is placed. As I have only a single specimen before me I am unable to say whether 

 this coloration is constant ; but I am inclined to believe that the reverse is the case, as 

 all the markings are rather obscure. 



36. Systena quadraticollis. 



Blackish aeneous ; legs testaceous ; apices of the posterior femora aeneous ; thorax square-shaped, the basal 



portion punctured ; elytra finely punctate-striate. 

 Length 1| line. 



Sab. Panama, Volcan de Chiriqui (Champion). 

 biol. cente.-amee., Coleopt., Vol. VI. Pt. 1, January 1885. 2 X 



