202 BULLETIN 182, UNITED STATES NATIONAL MUSEUM 



Type locality. — Trinidad, Ortocre River, 5 miles southeast of Rio 

 Claro. 



Types. — Holotype, Museum of Comparative Zoology, collected by 

 N. A. Weber on January 3, 1935. 



Records. — The following is the only record known to me : 



Trinidad: Rio Cluro (Weber, in M.C.Z.). 



Spedmens examined. — I have seen onl}^ the holotype. 



Remarks. — This is the smallest Osorius I have seen. It is un- 

 usually distinct because of its rounded clypeus and the smooth shin- 

 ing appearance of the integuments under low magnification. 



I have received no record of its habits. 



Subfamily Stylopodinae 



This subfamily has been known under the names Mcgalopinae and 

 Megalopsidiinae, with the type genera Megalops and Megalopsldia^ 

 respectively. The present change of name of the subfamily to agree 

 with that of the type genus (as explained under Stylopodu's) is not 

 required by the International Rules of Zoological Nomenclature but 

 is in keeping with the interpretation followed by many American 

 taxonomists. 



Only one genus has been described in this subfamily, and it is 

 represented in our region by at least six species. It may be readily 

 recognized by its very large and prominent eyes, transversely sulcate 

 pronotum, and shining integuments. 



XXVI. Genus STYLOPODUS Benick 



Stijlopodus Benick, 1917, p. 19<) {as subgenus of Megalops). 



Subgenus Megalopsidia Lkng, 1018, p. 204 (as new name for Megalops). 

 Megalops Ericuson, 1840, p. 751. (Not Lacepfde, 1803.) 

 Aulacotracheliis Benick, 1921, p. 1 (as new name for Megalops). 



Subgenus Oata, new name. 



Perostylus Benick, 1917, p. 190. (Not Pilsbry, 1894.) 



Subgenus Megalopsidiella BERNnAUj':B, 1933, p. 333. 



Genotypes. — Megalops cephalotes 'Erichson'= Stylopodus cephalotes 

 (Erichson) (original designation). Of Megalops, Oxyporm caelatus 

 Gi"<i\Q\\\\OY^i = Megalops caelata (Gravenhorst) (designated by Ben- 

 ick, 1917) ; of Megalopsidia and Aulacotrachelus, same as of Megalops, 

 under section II, f, of Rule 30 of the International Rules of Zoo- 

 logical Nomenclature; of Perostylus, Megalops praedlta Sharp = 

 Stylopodus {Perostylus) praeditus (Sharp) (original designation) ; 

 of Gata, same as of Perostylus, under same rule as above; of Mega- 

 lopsidiella, Megalopsidia oglohlini 'Bernhauer^ Stylopodus (Megalop- 

 sidiella) ogloblini (Bernhauer) (monobasic and original designation). 



