Calvert : Odonata of the Neotropical Region. 239 



Anterior lamina much less prominent than either of the other two 

 ordinarily visible genitalia of segment 2, its margin entire. Genital 

 haniule subequally, or a little less prominent than the genital lobe, in 

 profile view resembling that of M. ccqnalis in being wider at its apex, 

 in ventral view its outline presents the form of a U the outer limb of 

 which is a little longer than the inner, the convexity of the U being 

 anterior. Genital lobe wider than long. 



Wings practically uncolored ; under a lens a very slight trace of 

 ochraceous is visible at the extreme base of the hind pair. 



9 . Differs from the male as follows : frons (except the inferior mar- 

 gin) and vertex reddish-yellow or reddish-brown, with some blue re- 

 flections. Thoracic dorsum dark brown, a medial greenish-yellow 

 band, one-fourth to two-fifths as wide as either mesepisternum, con- 

 tinued forward on the prothorax and backward over the interalar 

 area. Sides of the thorax brownish-yellow ; a sinuous line on the 

 humeral suture, a nearly straight stripe on the second lateral suture, 

 the .lower half of the metepisternum (enclosing a round yellow spot), 

 much of the metepimeron, and the pectus, black. Abdomen yellow, 

 becoming brownish posteriorly ; a stripe bordering each lateral carina 

 of 1-7, the mid-dorsal carina of 4-7, a transverse line on the hind 

 ends of 2-7, most of 8-10, except the intersegmental articulations and 

 a linear mark on each side of the dorsum of 8, black. Appendages 

 as long as 9, three times as long as 10. Vulvar lamina reaching to 

 the middle of the lateral margin of 9, with a rather shallow median 

 notch. Style-like process of 9 apparently lost. Wings slightly ob- 

 scured throughout, pale ochraceous in the subcostal and cubital spaces, 

 as far as the first cross-vein of each. 



cT9. Front wings with 10 antedodals (11 in one wing of 1 cf = 

 5.5 per cent, c?), hind wings with 7 (8 in one wing of 1 c? and in 

 one wing of 1 9). The only variations from the venational features 

 given in the synopsis on page 229 are that no one cell reaches from 

 M 4 to Cu, on the hind wings in two wings c? and two wings 9 ; and 

 that the discoidal triangle is free in the front wings of 1 cJ'. 



Dimensions : abdomen cT 23-26, 9 22.5 ; hind wing cP 27-31, 9 

 28-28.5 mm - 



Habitat : — Brazil, Chapada, in May, by H. H. Smith, 4 cJ 1 and 

 parts of 2 rj\ 1 9 and part of 1 other, some labeled, all presumably 

 from the same locality. Carnegie Museum, Pittsburgh. 



A male labeled " Lib. athenais Selys Bresil" in de Selys' hand ; 2 



