ANISAGRION.—ENALLAGMA. 107 
Hab. Mexico, Jalapa (M. Trujillo: 1 3, 1 2), Texolo (Rhoads: 2 3), Huatusco 
(coll. Adams: 1 ¢,1 9), Atoyac (H. H. Smith: 1 3), Orizaba (F. D. Godman and 
H. H. Smith: 3 3 ), Cuernavaca ( Vienna Museum 1, Barrett, colls. Adams and P. P.C.: 
43,8 9; HA. Smith: 9 3,2 2), Omilteme [1 ¢, 3 2], Xucumanatlan [1 ¢, 
2 9], and Tepetlapa [1 ¢, 2 9] (A. WH. Smith); Guatemaia (M. C0. Z.: 146,12). 
Taken in different localities from March to December. The extreme dimensions 
given for the males are taken from two individuals captured at Cuernavaca in June, 
and almost the extremes for the females are found in the two from Xucumanatlan 
captured in July. A male from Cuernavaca has at least 100 mites (Acarina) on the 
metasternum behind the third legs, totally concealing it. | 
De Selys’s brief description! does not give the colour-differences due to age. I feel 
quite confident that this species is not congeneric with the European Wehalennia 
speciosa. 
ENALLAGMA. 
Enallagma, Charpentier, Lib. Eur. p. 21 (1840) ; Selys, Bull. Acad. Belg. (2) xli. p. 496 (187 6); 
Kirby, Cat. Odon. p. 145 (1890). 
A genus of very wide distribution, but not known from the southern part of South 
America or in Australia. 
Key to the Species known (or likely) to occur in Mexico and Central America. 
§ I. Nodal sector arising near the fifth postcubital, or more remote, on the 
front wings, near the fourth, or more remote, on the hind wings, which 
latter have seven to ten postcubitals. 
Males. 
1. Superior appendages shorter than the inferiors, and with no ventral 
process in their basal half ; abdominal segments 4 and 5 chiefly blue. 
A. Superior appendages at tip with a slender inferior prolongation which 
is curved slightly upward and inward. . - - + + + ; . [1. cyathigerum.] 
AA. Superior appendages slightly notched at tip, the lower division 
slightly longer . . . - - + es | [2. calverti.] 
2, Superior appendages longer than the inferiors. 
B. Third abdominal segment pale, with black markings confined to the 
apical third or less (except in some specimens of E. prevarum, in 
which they occupy the apical four-fifths). 
C. Black markings on abd. seg. 2 not U-shaped, pale colour on 3 
blue. 
D. Hind margin of prothorax convex throughout ; superior 
appendages bifid at tip, upper branch longer, a pale tubercle 
between it and the lower branch; abd. seg. 4 and 5 pre- 
dominantly blue. 2... 2 ee ee toe tot es 3. civile. 
p2 
