126 Annals of the Carnegie Museum. 



quently found on the front wing of mollis and three on that of reclusa, 

 yet not rarely individuals of the one species possess this character of 

 the other. The following appear to be more constant features sepa- 

 rating the females : 1'eclusa female has a small but distinctly developed 

 mesostigmal lamina (see pi. IV, fig. 66) which is distinctly visible as 

 a projection when the thorax is examined from the side in profile 

 view (the homolog of the lamina, see page 135, in mollis not visibly 

 projecting), no black marks on the nasus other than at the fronto-nasal 

 suture, the dorsal black stripes on abdominal segment 8 usually reach- 

 ing the whole length of the segment. Compare also the descriptions 

 of the black humeral stripe in mollis and reclusa females. 



43. Argia sordida. 



Argia sordida Hagen, Bull. Acad. Belg. (2) xx, p. 387, 1865. Hagen & Calvert, 

 Bull. Mus. Cornp. Zool., xxxix, p. 114, pi. I, fig. 20 (labium), pi. 2, figs. 3, 

 3# (appendages J ), 23 (mesostigmal laminae £> )> 1902. 



The only existing description of the colors of this species — the 

 original one of 1865 — is comparative only and so brief as to give 

 little information, wherefore the following, based in part on some of 

 Hagen' s cotypes. 



d\ Rear of the head black. Pale antehumeral stripe three-fifths as 

 wide as the black mid-dorsal. Black humeral stripe not forked above, 

 gradually widening from above downward ; at mid-height one third to 

 one fourth as wide as the pale antehumeral. A short black mark at 

 the upper end only of the second lateral thoracic suture. Abdominal 

 segment 2 violet, with a black stripe on each side from anterior to pos- 

 terior end, which stripe just before the latter end widens, so as to 

 approach closely, but not meet, its fellow of the opposite side on the 

 dorsum ; 3-7 black, with a transverse basal blue-violet ring prolonged 

 on 3 as a mid-dorsal stripe tapering posteriorly to four-fifths of the 

 segment, prolonged on 4 similarly to one-fourth of the segment, 

 while on 7 the ring is mid-dorsally interrupted with black; 8-10 

 dorsally pale brown in the dried specimens (blue? in life), their sides 

 black from end to end, the black more extensive at the hind end, 

 especially on 8, where it approaches that of the opposite side on the 

 dorsum, finally meeting it at the extreme hind end of the segment or 

 in the hindmost sixth; or on 10 the black may so invade the dorsum 

 as to leave only two small pale spots thereon. Compared with 

 Hagen' s figures cited above, the inferior appendages seen in profile 



