Rhinastus sternicornis
Rhinastus sternicornis is a species of beetles belonging to the family Curculionidae.

Description 
Rhinastus sternicornis can reach a length of  . This large species has very long legs and a strongly arcuate long beak. The pronotum and elytra are quite variable in granulation. The colour varies from pale to deeper tan or yellowish.

The adults of these beetles can be found from January up to March. They have been reported breeding in bamboos. The females puncture the young shoots and lay one egg in each perforation. The larvae develop in the internodes of bamboos and are considered a pest of these plants.

This species shows a striking sexual dimorphism. In fact the male and the female of this beetle were once believed belonging to different species (respectively to Rhinastus pertusus and Rhinastus sternicornis, actually considered synonyms).

Distribution
This species can be found in Brazil, Peru and Argentina.

References 

 Catalogue of Life
 Universal Biological Indexer
 Global species
 Patricia Vaurie Revision of Rhinastus and Description of a New Species of Cholus (Coleoptera, Curculionidae, Cholinae

Molytinae
Beetles described in 1824