32 



MUSEO NACIONAL DE BUENOS AIEES. 



Hind lobe of protliorax smaller tlian the otlier lobes, entire 

 rounded on its free margin, black, 



Thoracic dorsiim blackish. witliout yellow stripes, prninose in 

 older individuáis : sides dark metallic bine, an indistinct palé hu- 

 meral line, a ratlier broad, oblique, 3'ellow stripe on tlie mesepi- 

 meron just in front of tlie metastigma, a palé line on tlie second 

 lateral suture and a yellow stripe just above and contiguous to the 

 latero -ventral metathoracic carina; pectus luteous witli lateral 

 brown clouds on tlie metasternum. 



Legs black, coxae and first femora inferiorly luteous; hind ti- 

 biae with 9-13 anterior (outer), 17-19 posterior (inner) spines, 

 mostly shorter tlian the intervals separating them. 



Abdomen, viewed from below, narrower at the base of -1 than 

 at the base of 6, red on dorsum of 1-7 with a narrow brown 



or black stripe each 

 side * , these approa- 

 ching each other on 

 4-7 so as to leave 

 a narro wer , mid - 

 dorsal, longitudinal, 

 red stripe betAveen 

 them; on 5 the black 

 stripe is about one- 

 fourth as wide as 



Fig. 4. Profile of the genitalia of Orthemis (-iiUriformiis tliat side (i, e, half ) 



(^ n. sp., left side. 1, 2, 3, first, second and third abdo- of the dorsum On 



minal segments. al anterior lamina, h hamule. e apex i • i -i t ^„ 



? IV 1 í •. • . 1 V 1, which it lies; on 



or its extemal branch, ih apex oí its mtemal branch, ' 



OL genital lobe, vp vesicle of the penis. X 25. 8-10 the black stri- 



pes become con- 

 fluent on the dorsum and wider so that the red is reduced to a 

 narrower band or spot each side. Venter blackish, a reddish 

 streak near the lateral margin of each segment. 



Superior appendages slihtly longer than 9, black, convex and 

 arched in their basal half, thickened in the apical half which is 

 straighter and terminates in sharp, upwardl}^ directed apex; third 

 fourth with an inferior row of 5-7 denticles. 



Inferior ajopendage almost as long (less than one-eighth shor- 

 ter), black, apex one- third as wide as base, when viewed from 

 below, with the usual two upturned denticles. 



1 Absent except at ápices of 4-7 on Hagen"s male, with jiruinose thorax, from 

 Brazil; 8-10 however are as described above. 



