82 NEOTROPICAL P3ELAPHIDAE 



IV 



angustatus (Schaufuss). 1882. French Guiana. 



bicolor Raffray. 1904. Bolivia. 



crassicornis Raffray. 1891. Venezuela. 



insignis (Schaufuss). 1879. New Grenada (Colombia?) {semihyalinus 



(Schaufuss), 1882). 

 octopunctatus Raffray. 1904. Brazil. 

 reitteri Raffray. 1904. Brazil. 

 rubripennis Raffray. 1908. Argentina. 

 subacuminatus Raffray. 1904. Brazil. 

 zonalis new species. Panama Canal Zone. 



abdominalis Raffray. 1904. Brazil, (see also Raffray, 1911) 

 cavifrons Raffray. 1912. Brazil. 



muticus (Raffray). 1883. Colombia, (see also Raffray, 1904) 

 This census does not list rugulosus of Reitter, vide supra. 



RHEXIUS (LeConte, 1850) 



LeConte (1850, 1878) 

 Sharp (1887) 

 Schaufuss (1872) 

 Brendel (1893) 

 Raffray (1903, 1908) 

 Casey (1908) 

 Bowman (1934) 



This wholly American genus is better represented in North America (8 

 species) than in the neotropics (3 species), although the genotype insculptus 

 LeConte and a few other species have an essentially subtropical distribution. 

 Since all of the temperate species are distributed in the eastern part of the 

 United States, the distribution of the genus in the Americas follows the forested 

 areas, in a long curve from the drainage basin of the Amazon River, through 

 the Isthmus of Panama and into Louisiana, Mississippi, Missouri, Illinois, 

 Indiana, District of Columbia, Virginia, and Pennsylvania. The last complete 

 treatment of the North American forms was by Casey (1908, p. 278); the 

 neotropical forms have not been coordinated, and very probably will be found 

 to include many new species. 



The neotropical species all have four basal foveae on each elytron, but 

 show considerable variation in the relative lengths of tergites, of the first 

 antennal segment, and the structure of the pronotum. It is notable that the 

 Panamanian optatus is very similar to the genotype insculptus in general 

 aspect, while the Amazonian species depart radically from the more northern 

 forms. 



