144 Annals of the Carnegie Museum. 



although evidently closely allied to orichalcea and oznea, does not ex- 

 actly agree with the diagnosis of either of these species, since segments 

 3-7 are black with a blue transverse basal ring occupying only one- 

 fifteenth of the segments' lengths, and 8, while badly faded in most of 

 the examples, is in others unquestionably blue, with an inferior black 

 stripe each side of variable length, 9 blue with an inferior black stripe 

 each side as long as the segment, 10 similar, or with the black stripe 

 reduced to a spot. 



9. Agrees with the original description of orichalcea 9 except that 

 the mesepimeral branch of the humeral stripe ("bande posthumerale 

 noir bronze metallique " ) reaches the short black line on the upper 

 end of the obsolete first lateral thoracic suture in all but one or two 

 examples. I cannot distinguish these females from cenea 9, for, al- 

 though they seem to have a narrower mesostigmal lamina, I find on 

 re-examining a series of ccnea females that considerable variation in 

 the width of this structure exists in that species. 



Dimensions : abdomen ^ 26.5-30, $ 24-27 ; hind wing tf 18.5- 

 2i, 9 19-21 mm. 



Habitat : — Colombia, Bonda in Dept. Magdalena, by H. H. Smith, 

 1 9 June, 2 cT July, 12 cT 14 9 August, 2 c? 1 9 September, 1 J* 

 October, 1 c? 2 9 November. Carnegie Museum, Pittsburgh. 



I refer these speciment to orichalcea, notwithstanding the above- 

 mentioned differences, pending a re-examination of the types. 



57. Argia tinctipennis Selys. 



(Plate IV, fig. 62.) 



Argia tinctipennis (Bates, Mss. ) Selys, Bull. Acad. Belg. (2) xx, p. 396. 1865. 

 Hagen & Calvert, Bull. Mus. Comp. Zool., xxxix, p. 115, pi. 2, ff. 6, 6a. 1902. 



cj\ The black of the frons extends down between the antennae (but 

 not on the genae) to the nasus, which latter is blue. At mid-height 

 the pale (blue) antehumeral stripe is one-half to two-fifths as wide as 

 the black mid-dorsal, the black humeral stripe one and one-half times 

 as wide as the pale antehumeral. The intersegmental articulation of 

 9 and 10 is black. 



9- Agreeing with de Selys' description except that the pale colors 

 are pale browns or blues instead of "jaune olivatre" or " jaunatre," 

 differences doubtless due to differences of age. As in the male, the 

 black of the frons extends down between the antennae (but not on the 

 genae) to the nasus, but the latter is also black. At mid-height the 



