138 



U.S. NATIONAL MUSEUM BULLETIN 261 



Holotype male and one male paratype, Rio Santiago, Peru, and 

 two additional males from upper Rio Maranon, Peru (AMNH). 



This species is closely related to and closely resembles the two new 

 species below. Distinguishing characters are mentioned in the de- 

 scriptions which follow. 



Figure 128. — Ichlhyobelus plalyrrhinus, new species, holotype: j, 



lateral view. 



anal tube, 



Ichthyobelus regularis, new species 



Figure 129 



External characters as in /. plalyrrhinus, new species, except that 

 there is no black spot on middle of clypeus. Male pygofer not strongly 

 produced, broadly rounded apically, with apical group of macrosetae 

 and a few microsetae on disc before these; plates shorter than in 

 /. plalyrrhinus and with setae larger; aedeagus symmetrical, slender, 

 with a pair of elongate tapering lateral processes extending anteriorly 

 but regularly and slightly curved dorsally, apex with an unpaired 

 slender elongate process directed anteriorly and dorsally, dorsal 

 margin with strong angulation before midlength. Female abdominal 

 sternum VII as in /. bellicosus Melichar (fig. 127i), except that median 

 posterior lobe is much longer. 



Holotype male labeled "Amazon. /Fonteboa," a male topotype, 

 and a pair of specimens, Rio Purus, Brazil, all in RMS. 



