of the Amazon Valley. 313 



6. OpMstomis semifulvus, n. sp. 



? . Minus elongatus, postice vix attenuatus, fulvo- 

 rufus; elytris (margine basali maculaque humerali ex- 

 ceptis) nigris ; antennis vix incrassatis ; thorace crebre 

 punctate, linea dorsali laevi ; apicibus femorum, tibiarum 

 et tarsorum nigris. 



Long. 4^ lin. 



Hah. — Ega. 



7. Ophistomis alhicolUs. 

 Euryptera alhicolUs, Pascoe, Journ, Entom. i. 63. 



Elongatus, niger, thorace (vitta dorsali excepta) macu- 

 laque elongata elytrorum testaceo-flavis ; capita testaceo- 

 flavo, epistomate nigro-plagiato ; antennis articulis basi, 

 coxis femoribusque plus minusve testaceis. 



$ . Gracilis ; antennis longitudine corporis, apicem 

 versus vix incrassatis; elytris medio paulo angustatis, 

 ante apicem paululum iterum dilatatis. 



9 . Robustior j antennis dimidium corporis paulo 

 superantibus, medio (baud apicem versus) incrassatis j 

 elytris elongatis, parallelogrammicis, ante apicem paulu- 

 lum rotundatis. 



Hah. — St. Paulo, Amazons. 



The form of the rostrum, and the terminal ventral seg- 

 ment of the male, demonstrate that this species belongs 

 to OpMstomis rather than to Euryptera. 



Genus Euryptera. 

 Serville, Encycl. Meth. x. 688 ; Lacord. Gen. viii. 454. 



1. Euryptera atrip ennis, n. sp. 



Curta, postice paululum dilatata, punctata, pubescens, 

 subnitida, fulvo-rufa, elytris (macula humerali excepta) 

 nigris, tibiis tarsisque posticis fuscis ; antennis robustis, 

 medio paulo incrassatis ; capite antice satis elongate et 

 angustato, epistomate punctate polite; thorace minus 

 dense punctulato; elytris ante apicem paulo rotundate- 



