1902.] OF AMERICAN COLSOrTERA. 175 



produced at middle ; elytra metallic blue or greenish, finely 

 punctured in rows ; abdomen black. 



Length 4| millim. 



Head impunctate, the frontal tubercles entirely obsolete, the 

 carina short, pyriform ; eyes large, nearly entire ; antennae ex- 

 tending to about the middle of the elytra, black, the lower four 

 joints ferruginous, the third and fourth joints equal, but little 

 longer than the second joint ; thorax twice as broad as long, the 

 sides very feebly rounded, narrowly marginate, the anterior angles 

 oblique, not produced, the basal margin rounded and produced at 

 the middle, the basal sulcus straight and moderately deep, the 

 perpendicular grooves very deep, the surface impunctate, ferru- 

 ginous ; scutellum fulvous ; elytra convex, subcylindrical, finely 

 punctured in closely approached rather regular rows, distinct to 

 the apex ; breast and legs ferruginous; abdomen black. 



Hah. Bolivia. 



In this species the basal margin of the thorax has a distinct 

 round lobe at the middle, differing in this respect from most of 

 the other species of the genus : this character alone would scarcely 

 justify the creation of another genus, but it will assist in the 

 recognition of the species, in connection with the system of 

 coloration and the black abdomen. 



Lactica funerea, sp. n. 



Entirely dark violaceous, the last five joints of the antennse 

 fulvous ; thoi^ax transverse, impunctate, the basal sulcus deep ; 

 elytra purplish- violaceous, extremely finely punctured. 



Length 6 millim. 



Elongate, convex, the head impunctate, frontal elevations 

 entirely obsolete ; eyes not very large ; clypeus thickened, wedge- 

 shaped, carina narrow; antennae nearly reaching the end of the 

 elytra, black, the last five joints fulvous, the second half the 

 length of the third joint ; thorax strongly transverse, more than 

 twice as broad as long, the sides perfectly straight, narrowly 

 margined, the anterior angles oblique, the disc entirely impunctate, 

 blackish- violaceous, the basal sulcus and the perpendicular grooves 

 very deep ; elytra metallic purplish- violaceous, very finely 

 punctured when seen under a strong lens ; below and the legs 

 neai-ly black. 



Hah. Yurimaguas, Peru. 



Of this very distinct species, two specimens are in my 

 collection. 



Lactica costatipennis, sp. n. (Plate XX. fig. 1.) 



Flavous, the antennae (the basal joints excepted) and the tibite 

 and tarsi black ; thorax impunctate, the basal sulcus deep ; 

 elytra bright green, finely rugosely punctate, the sides of each 

 with an acute costa. 



Length 6 millim. 



Head flat and impunctate, the frontal elevations obsolete 



