Calvert : Odonata of the Neotropical Region. 229 

 149. Uracis fastigiata Burmeister. 



Uracis fastigiata Calvert, Biol. Centr.-Amer. Neurop. pp. 219, 402, pi. ix, figs. 7, 

 8. 1906, 1907. 



Habitat; — Colombia, Don Diego, by H. H. Smith, 1 rf. Car- 

 negie Museum, Pittsburgh. 



150. Tholymis citrina Hagen. 



Tholymis citrina Calvert, Biol. Centr.-Amer. Neurop. p. 220, pi. ix, figs. 9-11. 

 1906. 



Habitat: — Colombia, Bonda, by H. H. Smith, 2 d\ 1 9. Car- 

 negie Museum, Pittsburgh. 



MlCRATHYRIA. 



The following, modeled after the less extensive but more detailed 

 synopsis of the Mexican and Central American species, in the Bio- 

 logia Centrali-Americana, Neuroptera, pages 221-223, shows the grad- 

 ual reduction (or, if preferred, and the table be read backward, the 

 gradual increase) in density of the venation. It does not pretend 

 to include all of the known South American species, but only those 

 treated in this paper. As was pointed out in the work cited, these 

 venational characters are subject to more, (e. g., M. didyma hypo- 

 didyma), or less variation, so that specific identifications can not be 

 based on them alone ; but reference should always be made to the 

 structure of the genitalia and abdominal appendages of the males, and 

 the vulvar lamina and gonapophyses of segment 9 of the females. 

 On resemblances in these structures have been erected the subspecies 

 of M. didyma and of M. ocellata, in spite of the venational differences. 



Synopsis of Venational Characters of some South American Species** 



A. Number of cells between the hind angle of the triangle and vein A 2 immediately 

 opposite that angle on the hind wing tivo. 

 A. I. Internal triangle of the front wing 3-celled. 

 B. Discoidal triangle of the front wing 2-celled. 



C. Posttriangular field of the hind wing with no single cell reaching 

 from M 4 (-- short sector of de Selys) to Cu x ( = upper sector of 

 the triangle) ...didyma, some didyma hypodidyma, dythemoides. 

 CC. Posttriangular field of the hind wing with at least one cell reach- 

 ing from M i to C l atra. 



BB. Discoidal triangle of the front wing free. 



34 The letters preceding certain rubrics, as A, B, C, etc., are employed to indicate 

 similar rubrics in the table in the Biologia. 



