LESTES.—MEGALOPREPUS. 51 
One of the males from Atoyac has the metallic green on the thorax replaced by a 
dark coppery-red. The females from the same locality show considerable variation 
in size—abdomen 31-36 mm., hind wing 20-25. De Selys? says that the inferior 
appendages of the male are one-third as long as the superiors, but I find them to be 
nearer one-half the length. 
Subfam. 38. AGRIONIN AL. 
Following the Selysian division into legions, four are represented in the present 
fauna :— 
Supplementary sectors present, at least between the principal and ultra- 
nodal sectors; pterostigma “ false” (7. e., cross-veined) or absent . Legion 1. Pseupostiema. 
Supplementary sectors present, at least between the nodal and ultra- 
nodal; pterostigma “true” (¢.e., of one cell only, not cross-veined) Legion 2. Popaerion. 
Supplementary sectors absent *; pterostigma true; inferior sector of 
the triangle well developed, reaching to the level of the nodus 
or beyond . Ce 
Supplementary sectors absent ; pterostigma true ; inferior sector of the 
triangle absent or very short, not reaching beyond the level of 
the distal end of the quadrilateral . . . . . . . . . . . Legion 4. Proronzura. 
Legion 8. Acrron. 
Legion]. PSEUDOSTIGMA. 
Three genera are represented :— 
Wings broad, inferior sector of the triangle and the short sector curved and 
much branched; superior appendages of the male shorter than the 
inferiors ; quadrilateral free, pterostigma square or rectangular . . . . MEGALOPREPUS. 
Wings narrow, inferior sector of the triangle and the short sector almost 
straight, unbranched, or the latter slightly branched; superior appendages 
of the male longer than the inferiors. 
Postcostal area of two rows of cells, at least in its middle portion . . . . Psrupostiema. 
Postcostal area of asingle row of cells . . . . . 1... 1). he). )6Mectstrocasrer. 
MEGALOPREPUS. 
Megaloprepus, Rambur, Névr. p. 290 (1842) ; Selys, Bull. Acad. Belg. (2) x. p. 12 (1860) ; Mém. 
Couron. Acad. Belg. xxxviii. p. 6 (1886) ; Kirby, Cat. Odon. p. 119 (1890). 
There is but one known species :— 
1. Megaloprepus cerulatus. 
Libellula ceruiata, Drury, 1. Exot. Ent. iii. p. 75 and index, t. 50. fig. 1 (entire insect) (1782) '. 
Lestes cerulata, ibid. Westwood’s edit. iii. p. 77, t. 50. fig. 1 (1837) *. 
* The ultra-nodal is not included among those called supplementary. 
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