Calvert : Odonata of the Neotropical Region. 181 

 90. Oxyagrion divaricatum sp. nov. 



(Plate III, figs. 47, 48.) 



d\ Dorsal surface of head, of nasus, and of thorax pale reddish- 

 brown, redder on thorax than on the head ; lower margin of frons, 

 gense, labium, and under and rear surfaces of head, legs, much of the 

 ventral surface of the thorax and sides of the abdomen inferiorly yel- 

 low ; labrum (its free margin yellow) and dorsum of abdominal seg- 

 ments 1-6 bright red. Labrum yellow, thoracic dorsum paler, 

 ochreous, in young individuals. 



Hind margin of prothorax slightly produced into a median angle. 

 Mesepimera and metepimera each with a rather wide dull-yellowish 

 band, the area posterior to each band reddish-brown of the same 

 shade as the thoracic dorsum ; possibly these bands may be due to 

 post-mortem discoloration ; they are not evident in the young. 



The following abdominal markings are black : a fine transverse ring 

 on the intersegmental articulations beginning with that between 2 and 

 3; a dorsal spot on the hind third to sixth of 6, but in some still smaller, 

 and then isolated from the hind end of the segment ; dorsum of 7 

 (except at the anterior end in some), 8, and 10. 9 is blue. 



Hind margin of 10 medially elevated into a process with a rather 

 narrow and slightly bifid tip. Superior appendages, viewed from 

 above, a little longer than 10, reddish at base, blackish at apex, di- 

 verging throughout their length, each one with its outer edge slightly 

 convex, inner edge slightly concave, narrowing to the subacute apex ; 

 in profile view each appendage is directed upward with the terminal 

 third of the upper edge truncated almost horizontally, thus producing 

 a fairly acute tip at the distal end of the lower edge. The inner and 

 ventral surfaces of each superior appendage are grooved longitudinally. 



Inferior appendages in profile view higher than long, upper apical 

 angle slightly produced upward and caudadas a slender process, which 

 reaches to about one-fourth of the length of the superiors, inferior 

 apical angle rounded. 



Wings clear, venation brown, darkening with age ; stigma red, its 

 costal edge longest. 



$. Differs from the cT as follows: less red in the brown of head 

 and of thorax ; labrum and sides of thorax yellowish-brown ; the fol- 

 lowing black : a small mid-dorsal spot on 1, a transverse mark at two- 

 thirds' length of 2 and at four-fifths' length of 3, the last fifth of 4 with 

 a mid-dorsal line or stripe running forward for more than half the length 



