Calvert: Odonata of the Neotropical Region. 241 



convex above, a row of about six denticles on the inferior surface in 

 the third and fourth fifths of the appendage-length ; following the last 

 denticle the inferior margin is obliquely truncated to form the acute 

 apex ; there is a slight infero-internal denticle immediately after the 

 base. 



Inferior appendage reaching to slightly beyond the level of the last 

 denticle of the superiors, in ventral view its apex one-third as wide as 

 its base. 



Genitalia of abd. seg. 2 very similar to those of M. atlienais (see 

 above). 



Legs black, coxae yellowish, first femora greenish inferiorly in their 

 proximal half. 



Hind wings yellow in the cubital space half-way (or all the way — 

 Piedra Blanca ) out to the cross-vein and in the two cells immediately 

 adjoining the grayish membranule. 



9. Differs from the male as follows : metallic-blue on superior sur- 

 face of frons still more reduced, forming a small triangular spot in 

 front of the median ocellus ; reddish-brown replacing black on the 

 occiput and rear of the head ; pale green stripes alongside of the mid- 

 dorsal thoracic carina as long as the carina, anastomosing at the ante- 

 rior mesothoracic margin with the anterior (lower) ends of the longer 

 antehumeral stripe and of the almost horizontal band ; this last much 

 less definite owing to the predominance of pale green on the sides of 

 the thorax, there being from in front of the humeral suture only the 

 following dark markings : a short stripe on the upper parts of the 

 humeral and second lateral sutures, an inverted V-mark on the upper 

 half of the mesepimeron, a triangular spot on the lower end of the 

 mesepimeron and of the metepimeron, a smaller spot on the metinfra- 

 episternum. Abdominal segments 1-3 green, their sutures and carinas 

 black; 4 and 5 as in the male, but the spot and stripe wider (half as 

 wide as the side of the dorsum on which they lie) and the stripe reach- 

 ing to the hind end of each segment ; 6-10 lost. Yellow at the base 

 of the hind wings reaching distad a little beyond the cubito-anal 

 cross-vein, apices of all the wings from about the level of the proximal 

 end of the stigma faintly brownish. 



c?9. Front wings with 8-9 antenodals, and two posttriangular rows 

 increasing to three between the levels of the last and the next to last 

 antenodals. Hind wings with 6 antenodals. All four specimens agree 

 with the venational features given in the synopsis on page 229. 



