Calvert: Odonata of the Neotropical Region. HI 



icte?'ops male : " entre lesquelles [antennes] le noir du dessus de la tete 

 dessine, devant les ocelles, une double echancrure "), inferior append- 

 ages of the male entirely y.ellow (in icterops, " finissant subitement en 

 pointe noire "). 



From the descriptions of H. cequatoriale Selys and H. angustipenne 

 Selys, this pair differ by the shorter abdomen of the male, tooth of 

 the superior appendages not acute (acute in <zqiiatoriale , not in a?igus- 

 tiflenne), black of the upper surface of the head of the male not advanc- 

 ing to the upper surface of the frons (as it does in angustipenne, 

 although not in cequatoi-iale) . 



The length of the genital valves of the female appears to be unu- 

 sual in this genus. Hagen had given the manuscript name of inca to 

 this species, but published no description, and this name has already 

 been employed in an anatomical paper (Higgins, Proc. Acad. Nat. Sci. 

 Phila.,1901, p. 137, pi. Ill, fig. 18) when referring to material obtained 

 from the types here and now described (not 2 <$ as stated, /. c. )'. 



38. Heteragrion flavidorsum sp. no v. 

 (Plate III, fig. 41.) 



$. Differs from H. inca n. sp. (q. v. ), as follows: hind lobe of 

 prothorax entirely black ; pale color of the thorax yellow, the narrow 

 yellow line bordering each side of the mid-dorsal black stripe has dis- 

 appeared, except at its upper end and in front of the antealar sinus ; 

 dorsum of abdominal segment 1 chiefly blackish-brown, the fine mid- 

 dorsal longitudinal yellow line on 3-5 or 6 has expanded on the ante- 

 rior five-sixths of 3 and on the second to fifth sixths of 4—5 or 6 

 into a dorsal yellow stripe of almost the full width of the segments, 

 which stripe is bounded laterally by a blackish-brown line, thus sep- 

 arating the dorsal yellow from the ventral yellow ; transverse basal 

 yellow rings of 3-7 obscure, apparently interrupted by black mid-dor- 

 sally ; ventral surface of 7 brown throughout ; mid-dorsal longitudinal 

 blackish stripe on 8 confined to the anterior half of the segment ; 

 superior appendages as long as 9, tooth on the inner margin situated 

 at two-thirds of the appendage-length ; apices of inferior appendages 

 blackish ; legs brown, femora yellow inferiorly, tibise and tarsi black- 

 ish ; 17-18 postnodals on the front wing, 16-17 on tne hind. 



Abdomen 40.5; hind wing 24.5, its maximum width 4.0; costal 

 edge of stigma, front wing, .9, posterior edge of same-1.3 mm. 



Habitat. — Bolivia: Nine miles from Coroico, May 19, 1899, by 

 W. J- Gerhart, 1 $ . Academy of Natural Sciences of Philadelphia. 



