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Sphenophorus Schoenherr, 1838

Diagnosis: Small to moderately large, 5-20 mm in total body length; elongate-oval in form, generally uniformly black; antennal funicle of 6 articles, club with apical pilose part various, scape cylindrical, apex extended beyond posterior margin of eye; rostrum cylindrical; anterior margin of pronotum straight behind eye; tarsus of 5 articles, but article 4 small, located at very base of article 3, article 3 and 2 various in shape and form, ventral pilosity of article 3 various (but in Costa Rica and Panama species limited anterolateral angles or lateral margins); scutellum triangular, widest at or near base.

Natural history: Species of Sphenophorus are associated with various grasses, sedges and their relatives.

Diversity: Over 100 species of Sphenophorus are known from North, Central and South America. This is primarily a temperate group and only three species are known from Costa Rica and Panama.

Sphenophorus incurrens Gyllenhal
Sphenophorus sulcifrons Chevrolat
Sphenophorus venatus (Say)

 

  Key to species of Sphenophorus in Costa Rica and Panama  
1 Pronotum and elytra with thin surface encrustation or film which largely obscures surface sculpture and punctation S. sulcifrons Chevrolat
  - Pronotum and elytra with distinctly visible surface sculpture and punctation, no surface film or encrustation 2
2 Elytral intervals, pronotal flanks, most of pronotal disk (except lateral margins and middle at base and apex), and metasternum at middle impunctate S. incurrens Gyllenhal
  - Elytral intervals, pronotal flanks, pronotal disk and metasternum at middle uniformly distinctly punctate S. venatus (Say)

 


Sphenophorus incurrens Gyllenhal

Distribution: Costa Rica, Guatemala, Honduras, Mexico, Nicaragua and Panama.

Natural history: No significant information.


Sphenophorus sulcifrons Chevrolat

Distribution: Costa Rica, El Salvador, Honduras and Mexico.

Natural history: No significant information.


Sphenophorus venatus (Say)

Distribution: Costa Rica, Honduras, Mexico and United States, also in West Indies.

Natural history: In the United States, S. venatus has been associated with Cyperus esculentus, Scirpus validus, wheat, corn, and a variety of grasses (Vaurie 1951).

 
 

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