Calvert : Odonata of the Neotropical Region. 203 



pendages a little shorter than 10, straight, simple, apices acute, hind 

 margin of 10 moderately elevated mid-dorsally, when viewed from the 

 rear; 8 postnodals on the hind wings. 



No vulvar spine, although the posterior ventral margin of 8 is 

 strongly convex. Genital valves i.8mm. long (excluding "palps"), 

 reaching beyond the level of the tips of the abdominal appendages. 



Dimensions: abdomen cT 28.5, 9 29; hind wing $ 16, 9 19.5 

 mm. 



Habitat : — Brazil, Chapada, 1 c? and part of 1 other ; Rio de 

 Janeiro, 1 9, all by H. H. Smith. Carnegie Museum, Pittsburgh. 



107. Amphiagrion titicacae, sp. nov. 



(Plate VI, figs. 118-120.) 



cf . Head and thorax brownish-yellow, the latter reddish-brown in 

 older stages, the following black : antennae beyond the third joint, 

 central portion only of the upper surface of the head (leaving the area 

 between the three ocelli and a narrow stripe from each lateral ocellus 

 toward the antenna of the same side yellow), or the black may extend 

 out to the eyes as well as obliterate the yellow ocellar-ocular stripe, a 

 mark on each side of the middle lobe of the prothorax, the small area 

 between the mesostigmal laminae, a line on the upper end of the hu- 

 meral suture. Lips, underside of head and of thorax, a more greenish- 

 yellow. 



Median third of hind margin of prothorax produced caudad and 

 dorsad, and truncated, or slightly bilobed. A prominent, rounded, 

 hairy metasternal tubercle. 



Head, thorax, legs (in addition to the usual biserial black spines), 

 and ventral surface of the first three abdominal segments with many 

 long soft hairs, whitish on the underside of the head and on parts of 

 the legs, brownish elsewhere. 



Dorsum of abdominal segments 1-6 coral-red, of 7-10 blue, the fol- 

 lowing black : a fine transverse ring at most of the intersegmental 

 articulations, a transverse stripe (interrupted or absent in some) at 

 three-fourths of 3 and of 4, a wider similar curved band (or very small 

 in some) on the same part of 5, the hindmost third or fourth of 6, a 

 longitudinal lateral stripe on the posterior two-thirds or half of 7 and 

 for the whole length of 8-10, which stripe sends up a slender vertical 

 branch at three-fourths' length of 7 and at nearly mid-length of 8 and 



