Calvert : Odonata of the Neotropical Region. 205 



Homenochromatic females have the abdomen colored similarly to 

 that of the males, differing as follows : a transverse mid-dorsally inter- 

 rupted black stripe similar to that on 3 and 4 may be present at three- 

 fourths' length of 2 ; posterior dorsal fourth to two-fifths of 5 black, 

 in one with a fine mid-dorsal prolongation reaching forward to one- 

 fourth length of the segment from the base ; posterior dorsal three- 

 fifths to four-fifths of 6 pointed anteriorly ; the lateral longitudinal 

 black stripe on 7 occupying only the hindmost third or fourth, on 8 

 only the posterior three-fourths to three-fifths, on 9 only the anterior 

 three-fifths ; or, 9 may be blue, with a black stripe on each side of the 

 dorsum for the entire length of the segment, this black stripe wider 

 than in the male, narrowing posteriorly and with no vertical branch ; 

 or, 9 may be black dorsally, with a median pale line ; 10 pale, with a 

 transverse basal dorsal black stripe, or black dorsally, with a pale mid- 

 dorsal line. 



Heterochromatic females have the abdomen colored quite differently 

 from the male, as follows : Dorsum of segments 1-6 reddish-yellow, 

 the following markings black : a basal dorsal spot on 1, a hastate spot 

 pointed anteriorly occupying the entire length or nearly so, of 2-4, 

 the point abbreviated on 2 in some ; the posterior four-fifths to five- 

 sixths of 5 and three-fourths to four-fifths of 6 ; or 6 may have but 

 little more than the posterior half black, including a forwardly tapering 

 acute mid-dorsal prolongation. 7 blue, its hindmost half to third 

 black, sending forward three slender branches, one median and shorter, 

 the other two lateral and longer ; or the median branch may be want- 

 ing and the laterals very short ; or only the hindmost fourth of 7 may 

 be black, with no forwardly-directed branches. 8 black, or black 

 with a transverse basal blue ring ; or this ring enlarged to occupy the 

 anterior two-fifths of the length of the segment, but interrupted mid-dor- 

 sally with black ; or 8 blue, with a pair of dorsal black spots occupying 

 the posterior three-fifths. Dorsum of 9 black, with a mid-dorsal blue 

 spot ; or blue, with a black stripe on each side as long as the segment, 

 or reaching from the anterior end three-fourths of the way to posterior 

 end. 10 black dorsally, or with a median pale spot, or nearly as de- 

 scribed for the male ; or blue, with only a slight trace of black on each 

 side at base. Sides of 1-10 reddish-yellow, more red and less yellow 

 on the posterior segments. 



Dimensions: Abdomen $ 18.5-20.5, $ 18-20.5; hind wing c? 

 14. 5-16, $ 15-17 mm. 



