PLECTEOTETEA. 289 



11. Plectrotetra flohri. 



<? . Fulvous ; terminal joints of the antennae piceous, their third and fourth joints equal ; thorax rather 

 convex, the posterior angles not produced ; elytra dark blue, each elytron with four deeply impressed and 

 closely approached double rows of punctures, the interstices costate near the suture and apex; anterior 

 tarsi dilated ; intermediate tibiae with an acute spine. 



Length 2\ lines. 



Hab. Mexico, Michoacan (Flohr). 



The single male specimen kindly sent to me by Mr. Flohr differs again from its allies 

 in the rather feeble and short antennae, which have the third and fourth joints of equal 

 length and the following joints rather shorter. The elytral punctuation is strong and 

 closely approached, although the double rows are not difficult to see, while the inter- 

 stices are equally distinctly costate, although not acutely raised — that is, not forming 

 sharp ridges. The antennas in this species approach more those of a female; the 

 structure of the tarsi and tibiae, however, proves the specimen to be a true male. 



12. Plectrotetra inaequalis. 



c?. Fulvous; antennae, their two basal joints excepted, black; third and fourth joints equal ; elytra violaceous, 



geminate-punctate striate at the disk, the sides more irregularly punctured and costate. 

 $ • Metallic green. 

 Length 2\ lines. 



Hab. Mexico, Toxpam, Capulalpam (Salle). 



Although the present insect seems to me a somewhat doubtful species, I must 

 separate it from those with which it has in common the structure of the antenna?, on 

 account of its different elytral punctuation. The latter is arranged as follows : — two 

 double rows of punctures are placed on the disk near the sutural portion, the suture 

 itself being accompanied by another row of anteriorly double but posteriorly single 

 punctures ; these double rows have often extra punctures placed close to them, which 

 gives them sometimes the appearance of consisting of three lines ; towards the sides 

 the punctuation becomes irregular, subrugose, and stronger, and the interstices are 

 distinctly but not acutely costate. A single female specimen from Capulalpam agrees 

 perfectly with the male in the elytral sculpture, but the colour of the elytra is metallic 

 green, and the antennae are nearly entirely black ; in the male the latter are scarcely 

 thicker at the base than at the apex, slender and long. 



13. Plectrotetra nigripes. 



cJ . Below and the legs and antennae black ; third joint of the latter much longer than the second ; head and 



thorax fulvous ; elytra dark violaceous blue, strongly subgeminate punctate-striate. 

 Length 2 lines. 



Hab. Guatemala, Diienas (Champion). 



In this species the antennae have more of the typical structure than is the case in 

 many others, the basal joints being robust, and the terminal ones gradually tapering 

 biol. ceote.-amee., Coleopt., Vol. VI. Pt. 1, April 1884. 2 p 



