Calvert : Odonata of the Neotropical Region. 153 



narrow stripe (in subapicalis it is nearly as wide as the segment, when 

 seen in strictly dorsal view), there is a pale blue or yellow mid-dorsal 

 longitudinal line or narrow stripe, which does not taper, on 3-6 reach- 

 ing from the transverse basal ring to three-fourths or more of the 

 length of each segment ; the superior abdominal appendages are shorter, 

 both absolutely and relatively, the inferior appendages have the 

 branches of the bifid apex less divergent and of equal length. 



62. Argia iralai, sp. nov. 

 (Plate IV, fig. 65.) 



9 . Rear of the head yellowish, a small black streak on each side of 

 the occipital foramen, anterior surface of the first, and of part of the 

 second antennal joints pale (ochreous), black of the frons not reaching 

 down as far as the base of the antennae, a black line on the fronto- 

 nasal suture. Pale antehumeral stripe at mid-height very slightly 

 wider than half to three-fifths as wide as the mid-dorsal black. Black 

 humeral stripe at mid-height half as wide as the pale antehumeral, 

 slightly forked, or not so at its lower end, forked in its upper three- 

 fifths to two-fifths, humeral branch mostly linear, mesepimeral branch 

 wider, curved backward (caudad) at its upper end to reach the short 

 black line on the upper end of the obsolete first lateral thoracic 

 suture. Second lateral suture with a black line on its upper part, or 

 all the way down to the metinfraepisternum. Dorsum of abdominal 

 segment 2 violet, with a black stripe on each side as long as the segment, 

 widening mesad before the hind end of the segment, but not meeting 

 its fellow of the opposite side on the dorsum, and again narrowing to 

 its hind end ; dorsal violet at its widest half as wide as the segment 

 itself; side below the black stiipe yellowish, without distinct dark 

 markings. Segments 3-7 black, with a narrow transverse pale basal 

 ring confluent with a pale mid-dorsal narrow stripe on 3-5, or line on 

 6, nearly as long as each segment ; sides of 3-7 inferiorly pale, except 

 for a blackish spot at the hind end of each ; 8 with a wider dorsal and 

 a narrower inferior longitudinal black stripe on each side, all as long as 

 the segment, the two dorsals nearer to each other than either is to the 

 adjacent inferior, confluent with each other anteriorly, but not with 

 the inferiors ; 9 similarly marked except that the two dorsals reach 

 only to two-thirds of the segment's length, and are not confluent, the 

 inferior stripe may be broken into spots ; 10 pale, with only a small 

 basal lateral black spot. 



