Calvert : Odonata of the Neotropical Region. 225 



138. Dorocordulia errans sp. nov. 

 (Plate VII, fig. 131. ) 



d\ Head lost (replaced by that of some Libelluline). 



Thorax metallic-green with some pale brown on the sutures and on 

 the pectus. 



Abdomen in dorsal view narrowing very gradually from 2 (2.2 

 mm.) to the base Of 5 (1.2 mm.), thence widening to the base of 8 

 (3 mm.), thence narrowing to the hind end of 10 (1.2 mm.) ; seg- 

 ment 1 pale brown, dorsum of 2-8 metallic-green, bordered on each 

 side with orange for the entire length of each segment above the lateral 

 carina ; 9 similar, except that black replaces the metallic-green, 10 

 black, with a small orange spot on each side at its hind end, and a low 

 mid-dorsal carina. Ventral side of 3-10 blackish, the extreme inferior 

 edges of the tergites, where they underlap the sternites, yellowish. 



Superior appendages not quite as long as q -f 10, dark brown, sub- 

 cylindrical, slightly enlarged in the proximal fourth and in the distal 

 third chiefly on the outer and lower surfaces, apex rounded, not at all 

 acute, lower surface bordered externally with a carina, which at the 

 extreme base forms a slight convexity, no other teeth or tubercles. 



Inferior appendage almost as long as the superiors, blackish, tri- 

 angular when viewed from below, much attenuated in the distal third ; 

 apex one-fourth as wide as base, barely excised, slightly upcurved. 



Wings very faintly yellowish, this color best seen in the anal 

 triangle; stigma brown (its costal edge 2 mm. long), many of the 

 veins in the proximal half of the wing pale brown or yellow, darker 

 in the distal half and near the hind margin. Venation very similar 

 to that shown in Plate XLII, fig. i, M Proc. U. S. Nat. Mus., vol. 

 xxvi, by Prof. Needham, even to the anal loop, but differing in that 

 the front wings have the internal triangle divided into two cells by a 

 perpendicular vein and two rows of posttriangular cells not interrupted 

 by three cells just proximal to the level of the nodus. The agree- 

 ment with this figure is indeed better than with that of D. libera 

 given by M. Martin (Coll. Zool. Selys, Cordulin. p. 35, fig. 39). 

 We may add that the front wings have 7-8 antenodals, 6 postnodals ; 

 the hind wings 5 antenodals, 7-8 postnodals. 



33 This is the figure, erroneously labeled as Neocardulia androgynis in the ex- 

 planation of that plate, to which attention is called in the footnote to page 223 of the 

 present memoir. 



