1902.] OP AMERICAN COLEOPTERA. 203 



groove, the siirface, like the head, rufous and impunctate ; 

 scutellum of the latter colour ; elytra greenish-feneous, with very 

 closely approached and irregular rows of rather fine punctures, 

 which are evenly distributed over the entire surface ; below rufous, 

 the abdomen paler, the tibiae and tarsi more or less black ; the 

 prosternum rather broad, elongate. 



Hah. Peru. 



I know only a single specimen of this large species, which seems 

 allied to G. consularis Har. from Colombia, but differs in the 

 colour of the underside, the difierent comparative length of the 

 joints of the antennae, and the non-continued thoracic sulcus. 



Kasigona, gen. n. 



Body elongate; antennae filiform; lower portion of the face 

 concave, the clypeus not separated ; thorax transverse, the 

 anterior angles oblique, the surface obsoletely sulcate near the 

 base ; elytra closely punctate-striate, their epipleurae broad, con- 

 cave, the anterior and intermediate tibiae unarmed, posterior tibiae 

 with a small spine, non-sulcate, the metatarsus of the posterior 

 legs as long as the following joints together, claws appendiculate ; 

 prosternum narrowly elongate ; the anterior coxal cavities closed. 



The genus here proposed is allied to Oxygona, Nasidia Har., and 

 Systena, but differs from all of them in the structure of the head, 

 which at its lower portion resembles that of some genera of 

 Longicornia or of Loxoprosopus among the Halticidfe ; the structure 

 of the antennae and the shape of the thorax differ likewise from 

 Nasidia, and the punctate-striate elytra from Oxygona. From 

 Systena the gen vis may be separated by the structvu*e of the 

 head and the very elongate joints of the antennae, as well as by 

 the punctate-striate elytra. 



Nasigona PALLIDA, sp. n. (Plate XX. fig. 12.) 



Entirely pale testaceous ; anteixnae black, the apical three joints 

 testaceous, head and thorax impunctate ; elytra strongly punctate- 

 striate, the punctures nearly obsolete at the apex, a spot near the 

 scutellum and another near the apex piceous. 



Var. Elytra without spots. 



Length 5 millim. 



Head entirely impunctate, testaceous, the frontal elevations 

 raised anteriorly and divided by an elongate fovea ; clypeus forming 

 a single piece, perpendicular, with a feeble central and lateral 

 ridge, the anterior edge likewise narrowly raised ; labrum large, 

 apex of the mandibles black ; antennae slender, all the joints, 

 with the exception of the second, very elongate, the basal one and 

 the last three joints testaceous, the others black ; thorax twice as 

 broad as long, the sides distinctly constricted at the base, rounded 

 anteriorly, the anterior angles oblique, the surface impunctate ; 

 scutellum rather broad, impunctate ; elytra wider at the base 

 than the thorax, the base slightly raised, strongly punctured in 

 closely approached rows, the interstices more or less distinctly 



14* 



