2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 63 



There is a regular line of these papillse on either side of the median 

 dorsal dark line, which gradually becomes irregular and disappears 

 somewhat before the middle of the body. There are two scalloped 

 rows, one along each of the outer margins of the dorsal surface of 

 the body, consisting of a series of arcs of which the convexity is 

 above each of the ambulatory legs ; beyond these in the males there 

 are similar lines with the arcs alternating with those in the inner 

 rows, their convexity being between the legs, and reaching down 

 to the level of the leg bases. Between the median and lateral lines 

 the enlarged papillae are arranged in a sinuous and more or less 

 irregular line, with scattered ones on either side of it; but toward 

 the posterior part of the body they become less and less numerous, 

 and more and more irregular in their position. 



All of the legs are provided with feet. 



The creeping pads consist each of four arcs of nearly equal width, 

 of which the fourth is about as long as the second. 



The urinary tubercle which, in reference to the short diameter of 

 the third arc is approximately central in position, divides the third 

 arc into two parts, of which the posterior is much smaller than the 

 anterior, and is entirely separated from the tubercle, which is broadly 

 united with the anterior portion. The conditions in these specimens 

 is well represented in Bouvier's figure. 



Remarks. — These individuals appear to agree with the specimens 

 of Oroperipatus corradoi from Guayaquil as described by Bouvier. 



Range.— Oroperipatus corradoi is now known from Quito, Balzar 

 and Guayaquil, Ecuador, and from Ancon, Panama Canal Zone. 



List of the Species of Onychophores Knoivn from the Isthmus 



of Panama 

 Oroperipatus corradoi (Camerano). 

 Oroperipatus eiseni (Wheeler)'. 

 Macroperipatus geayi (Bouvier). 

 Epiperipatus hrasiliensis (Bouvier). 

 Epiperipatiis edwardsii (Blanchard). 



^ This species has not actually been taken on the isthmus, but as it ranges 

 from Tepic, Mexico, south to the Rio Purus, Brazil, it probably occurs there. 



