Calvert : Odonata of the Neotropical Region. 113 



tealer sinus and mid-dorsal stripe by a pale yellowish line, but is con- 

 fluent at its lower end with some black on the anterior mesothoracic 

 margin with which the mid-dorsal stripe is also confluent) , a mesepimeral 

 stripe not reaching the wing-base above, widening inferiorly, subequal 

 in width to the pale area separating it from the black mesepisternal 

 stripe, faint traces of markings on the upper ends of metepisternum 

 and metepimeron, a short oblique streak just above the metastigma in 

 the oldest male, a small bilobed dorsal spot on abdominal segment i, 

 some indistinct marks on each side of the dorsum of 2, a terminal 

 transverse ring on the posterior sixth of 3-6, the posterior margin of 

 10, the superior abdominal appendages, a superior and an inferior 

 longitudinal stripe on the femora, the inferior surface of the tibiae and 

 much of that of the tarsi. Abdominal segments 3-7 have a transverse 

 basal yellow ring between which and the terminal blackish ring (on 

 3-6) most of the segments are brown dorsally, except for a fine mid- 

 dorsal longitudinal yellow line, although this brown is much paler in 

 the fourth and fifth sixths of 4-6 than in the basal halves of those seg- 

 ments ; most of 7 is brown, paler posteriorly, 8-10 brownish-yellow. 



Superior abdominal appendages not as long as 9, twice as long as 

 10, forcipate, apex obtusely rounded, basal fourth swollen, especially 

 inferiorly, but also superiorly and interiorly, inner margin at half-length 

 with a stout tooth obliquely truncated at tip, visible both in dorsal and 

 in profile views, outer margin in the apical third with four spines. 

 Inferior appendages undeveloped. 



Pterostigma of the usual shape, dark brown, surmounting two cells 

 or more. Front wings with 18-22 postnodals, 3 (62^ per cent.) or 

 2 (si}i per cent.) antenodal cells distal to the quadrilateral. Hind 

 wings with 16-19 postnodals, 2 (873^ per cent.) or 3 (12^ per cent. ) 

 antenodal cells distal to the quadrilateral. On all the wings the 

 cubito-anal cross-vein (= basal postcostal of de Selys) is close to the 

 arculus, being proximal thereto by less than the total length of the 

 arculus ; point of separation of vein A (= postcostal of de Selys) from 

 the hind margin of the wing only slightly distal to the level of the 

 proximal end of the quadrilateral, or at that level, or even slightly 

 proximal thereto. 



9. Dull yellow replacing pale reddish-brown of the male, pale 

 stripes on upper surface of head more extended, those from the lateral 

 ocelli to the eyes confluent in front of the median ocellus, hind lobe 

 of prothorax more produced posteriorly, its central black spot circular, 



