114 Annals of the Carnegie Museum. 



mesepisternal black stripe narrower, its lateral edge ill-defined, a black 

 stripe on each side of the dorsum of abdominal segment 2 for almost 

 its whole length, brown on the anterior five sixths of 3-7 almost black, 

 not paler in the fourth and fifth sixths, a mid-dorsal longitudinal 

 yellow line on 2-9 (not 2-7 as in the original description of 1862), 

 a transverse basal yellow ring on 2-7 (not 2-9 as in the original 

 description) ; on the sides of 2-8 below the dorsal blackish is a longi- 

 tudinal yellowish stripe confluent with the transverse basal yellow 

 ring, ending posteriorly at the transverse black ring on 3-7, and 

 below this yellowish stripe is a similar blackish stripe ; 9 is brown 

 with an oblique lateral yellow band running from the anterior margin 

 backward and upward so as to be confluent with the posterior end of 

 the mid dorsal longitudinal yellow stripe already mentioned; 10 yel- 

 lowish, dorsum brown, its entire posterior margin armed with about 

 14 spinules much longer and stouter than those of any other segment. 

 Appendages longer than 10, very acute, brown. Genital valves yellow, 

 lower margin with curved serrations. 



Front wings with 18-20 postnodals, 2 antenodal cells distal to the 

 quadrilateral. Hind wings with 15-16 postnodals, 2 antenodal cells 

 distal to the quadrilateral. 



Abdomen cT 40, 9 32 ; hind wing cf 25-26, 9 26-27 ; costal 

 edge of stigma, front winged 1-1.1, 9 1.2; posterior edge of same 

 stigma c? 1. 5-1.8, $ 1.8-2 mm. 



Habitat. — Brazil, Chapada, by H. H. Smith, 1 c? collector's 

 number 44, 1 <$ No. 109 (lacks abd. seg. 8-10), 2 c? lacking ab- 

 domens, 1 $ lacking abd. seg. 4-10, 1 9 lacking head. 



The type (female) of H. triangulare was from " Bresil meridionale 

 (Schott). (Mus. de Vienne.)" 



40. Heteragrion aurantiacum Selys. 

 (Plate III, fig. 40. ) 



Habitat. — Brazil : Rio de Janeiro, by H. H. Smith, 1 c? and 

 parts of 3 d\ November, 2 9, December, 1 9 and part of one other. 

 Carnegie Museum, Pittsburgh. 



Paraguay: Sapucay, by W. T. Foster; November, 1899, 4 tf 

 (No. 22), December, 1899, 4 $ (No. 22), 1 9 (No. 58), January, 

 1900, 1 9 (No. 58). U. S. National Museum. 



I am not certain whether all these specimens belong here or not, 

 but they agree better with the description of H. aurantiacum than with 



