130 Annals of the Carnegie Museum. 



Dimensions : Abdomen cT 28.5—30, 9 27-29; hind wing cP 22- 



2 3-5> 9 2 3- 2 5 mm - 



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



5 cP 1 $ (collector's number 15), 1 c?3 ? (collector's number 16 — 



this number is attached also to 2 $ of another species); January 11 



and 16, 1903, 4 cT (collector's number ^^, which is attached also to 



a male of Argia thisnia and a male of A. reclusd). U. S. National 



Museum. 



45. Argia gerhardi sp. no v. 



(Plate IV, figs. 60, 70, 70O 

 d\ Rear of the head black, a narrow pale stripe along each eye 

 margin ; black of the frons not reaching as far down as the bases of 

 the antennae, the first joint of which is pale anteriorly. Pale (violet) 

 antehumeral stripe half as wide as the black mid-dorsal which latter 

 often has a dark green reflection. A dark line on the entire length, 

 or on only the upper part of the humeral suture, in the former case 

 wider at its upper end ; from the lower end of the suture extends up- 

 ward a pale brownish mesepimeral stripe having some bronzy-green 

 reflection and which diverges from the suture, ending a little below 

 the upper margin of the sclerite and a little anterior to a short black 

 line usually present on the upper end of the obsolete first lateral suture, 

 or this pale brown stripe may be wider and border the humeral suture 

 for its whole length, reaching the upper margin of the mesepimeron 

 and back to the obsolete first lateral suture and at mid -height may equal 

 in width the pale antehumeral. Second lateral thoracic suture with a 

 stripe for its entire length, brownish below, blackish above, on the stripe 

 almost obsolete except at the upper end. Abdominal segment 2 blue 

 dorsally, each side with a longitudinal black stripe reaching from base to 

 five-sixths of the segment's length, widening mesad to its hind end, but 

 not meeting its fellow of the opposite side, sometimes broken into a stripe 

 and a spot ; dorsal blue between these two stripes at its widest two- 

 thirds as wide as the segment ; side below the black stripe pale, yellow- 

 ish, unmarked. Segments 3-7 black, with a narrow transverse basal 

 pale ring, which on 3-5 is confluent with a mid-dorsal violet or blue 

 stripe, tapering posteriorly, reaching to five-sixths or the whole length of 

 3, to half or five-sixths of 4, to two-fifths or not beyond the basal ring of 

 5, or 5 and 6 may have a fine pale mid dorsal line on the greater part 

 of their length ; sides of 3-6 inferiorly pale, except in the hindmost 



