Calvert : Odonata of the Neotropical Region. 133 



Pale (violet) antehumeral stripe three-fifths as wide as the black 

 mid-dorsal. Black humeral stripe of subuniform width, as wide as the 

 pale antehumeral, not forked. A blackish-brown stripe three-fourths 

 as wide as the black humeral on the entire length of the second lateral 

 thoracic suture. 



Dorsum of abdominal segment 2 violet occupying two-thirds of the 

 width of the segment, bounded on each side by a black stripe extend- 

 ing the entire length of the segment and widened mesad at four fifths 

 length, but not meeting its fellow of the opposite side, subsequently 

 narrowed in the hindmost fifth ; this black stripe appears to be due to 

 a fusion of two narrower parallel stripes, one superior, one inferior, 

 probably more or less separated from each other in earlier stages ; 

 inferior lateral margin of the tergite of 2 pale for its entire length. 



Dorsum of 3 and 4 predominantly violet, a longitudinal black stripe 

 on each side meeting its fellow of the opposite side in the hindmost 

 sixth of the dorsum ; 5-7 black, with a narrow transverse basal pale 

 ring ; 8-9 blue, with a black stripe on each side as long as the seg- 

 ments ; 10 black. 



Wings faintly obscure yellowish, stigma surmounting slightly more 

 than one cell on all. Front wings with four antenodal cells, hind 

 wings with three. 



Abdomen 23.5, hind wing 16.5 mm. 



9 unknown. 



Habitat : Peru, Iquitos, Staudinger, 1 c?. Museum of Compara- 

 tive Zoology, Cambridge, Mass. 



The specific name proposed is that of a human tribe of the vicinity. 



The type specimen is pruinose on the sides of the prothorax, mese- 

 pimeron and metepimeron before and behind the brown stripe of the 

 second lateral suture, pectus, coxae, some of the sclerites of the inter- 

 alar dorsal area, and parts of the dorsum and sides of the first abdomi- 

 nal segment. 



47. Argia oculata Hagen. 



Argia oculata Calvert, Biol. Centr.-Amer. Neurop., pp. 8l, 367; pi. iv, figs. II, 

 36, 36*, 36&-U. 1902, 1907. 



Purely for convenience the present material is grouped into two lots : 

 a. Northern South America. 



Colombia, Cacagualito, in Dept. Magdalena, by KL H. Smith, 1 

 d\ Carnegie Museum, Pittsburgh. 



Venezuela, La Guaira, by Lyon and Robinson, July 3, 1900, 3 c? ; 

 San Julian, by M. W. Lyon, Jr., July 20, 1900, 2 cT» 



