404 MR. MARTIN JACOBY ON NEW SPECIES OF [DeC. 13, 



minutely punctured, the posteiioi- portion metallic blue, the 

 anterior one fulvous. 



Lengtli 7 millim. 



Head produced, impunctate, fulvous, the frontal elevations 

 strongly raised, tubercviliform ; clypeus thickened, flavous ; 

 antennae extending to two-thirds the length of the elytra, black, 

 fourth and following joints very elongate, the third shorter ; 

 thoi-ax subquadrate, the sides distinctly angulate before the middle, 

 the anterior angles acute, the disc with a deep transveivse sulcus 

 near the base and a depression anteriorly (accidental?) impunctate, 

 fulvous ; elytra extremely minutely punctured, fulvous, with a 

 slight purplish gloss, the posterior portion, from immediately below 

 the middle, bright metallic blue ; elytral epipleurse very broad, 

 fulvous anteriorly, blue at the posterior half ; underside fulvous, 

 the abdomen and the posterior legs as well as the tibise and tarsi 

 black. 



Hah. Peru. 



Excepting in the deep thoracic sulcus, this species (of which I 

 possess a single, apparently female, specimen) agrees in all 

 structural details with the others, but is much larger and well 

 distinguished by its coloration ; thoracic feeble sulci can also be 

 perceived in the other species of this genus. 



ACANTHONYCHA STALI, Sp. n. 



Fulvous ; the antennae (the basal joint excepted) and the til^ise 

 and tarsi black ; thorax impunctate, shining ; elytra very minutely 

 punctured, rather flattened. 



Length 6 millim. 



Head impunctate, shining ; antennae, extending to the middle 

 of the elytra, black, the basal joint fulvous, third joint much 

 shorter than the fourth ; thorax subquadrate, of the same shape 

 and smooth as in the allied species, more transverse however, 

 and distinctly angulate before the middle in the female insect ; 

 elytra obsoletely depressed below the base and longitudinally 

 so within the shoulders, very finel}^ and closely punctured, the 

 posterior femora rather strongly incrassate. 



Hah. Tucurrique, Costa Rica. 



Eather larger than the other species of the genus, the antennae 

 with fulvous basal joint, the fourth joint proportionately longer, 

 the elytra differently coloured, and the posterior femora more 

 strongly incrassate. I cannot discover any sexual characters in 

 the structure of the last abdominal segment, which seems the same 

 in all the specimens before me, but the shorter antennas and more 

 transversely shaped thorax, with its strongly angulate sides in one 

 of the specimens, are probably the female characters. 



ACANTHONYCHA COSTATIPENNIS, Sp. U. 



Fulvous ; the antennae (the basal joints excepted) and the tibiae 

 and tarsi black ; thorax subquadrate, impunctate ; elytra dark blue, 



