CALVEET: ODONATA OF PAEAGUAY. 



33 



Genitalia of 2 rather prominent, esj)ecially tlie liamule which. 

 projects mnch more than anterior lamina or genital lobe, and 

 which. is stout, apex bifid, inner brancli slender, spine-like, direc- 

 ted forward and ventralward, tlie outer brancli mucli larger, broad 

 and lamellate, rolled inward and ventralward and also terminating 

 in a small spine directed forward and lying almost directly below 

 tlie spine-like inner brancb. Anterior lamina lialf as prominent as 

 the bamnle, forming an almost semicircular wall in front of tbe 

 latter and baving an entire margin. Genital lobe about as piomi- 

 nent as tlie lamina, somewliat wider than high, ronnded . 



Wings: arcnlus at the second antenodal or beyond, two rows of 

 cells between snbnodal sector and snpplementary sector next 

 below. Front wings: 15-17 antenodals, 12-16 postnodals, triangle 

 with one cross-vein, internal triangle 4-celled, three posttriangnlar 

 rows increasing near the level of the nodus to 6-8^ marginal cells; 

 merest trace of yellow at bases of the great veins. Hind wings: 

 12-1-1 antenodals, 13-17 postnodals, three posttriangnlar cells, 

 then two rows increasing to 12-16 marginal cells. Brownish- 

 yellow in the subcostal submedian spaces reaching half-way or 

 less to first antenodal and submedian cross-vein and in the post- 

 costal space outward f or one cell and back to the apex of the grey 

 or almost black membranule. Pterostigma dark brown. 



9 • Similar to the cf , but with the metallic blue on th.e head less 

 intense, the black and brown of the body generally paler, labrum 

 brown with black margins, thoracic dorsum predominantly luteous, 

 the black of the cf being represented by an illdefined brown stripe 

 on either side of the median carina not reaching the antealar sinus 

 above, and by a similar antehumeral stripe. Third tibiae shorter. 

 Sides of 8 with an inferior enlargement which is palé yellow. Ap- 

 pendages twice as long as 10, almost as long as 9, black, ápices 

 acute. 



Total length cf 46-47, 9 47 mm; abdomen c5^ 31-32, 9 32; 

 front wing cf 37-39, 9 ^'^1 hind wing cf 36-38, 9 36; pterostigma 

 5; sup. apps. cf 2, apps. 9 1?25; third tibiae cf 6-6,5, 9 ^)^; 

 width of abdomen at 2: cf 2,5, 9 2,75; at 4: cf 1,8, 9 1,6 at 7: cf 

 2-2,5, 9 I76, at 10: cf 1,5, 9 ^^'^^'í width of wings at nodus- 

 front cf 7,5, 9 7; hind cf 10, 9 9 mm. 



Two males and one f emale ; in making the descri^ítion, Hagen's 

 type, marked «Mus. Berol.» and «Bresil?», now in the Museum of 

 Comparative Zoology, Cambridge, Mass., has also been used. 



1 Five in one wing of the 5. 

 Anal. Mus. Nac. Bs. As. vii — Noviembre 16, 1899. 



