ERYTHRODIPLAX., 205 
8. Erythrodiplax ochracea. (Tab. IX. fig. 40.) 
Libellula ochracea, Burm. Handb. Ent. ii. p. 854 (1839) *; Calvert, Trans. Amer. Ent. Soc. xxv. 
p- 71 (1898) ?. 
Diplax ochracea, Hagen, Syn. Neur. N. Amer. p. 181 (1861) * (excl. Surinam gf); Proc. Bost. 
Soc. Nat. Hist. xv. p. 8375 (1873) *. 
Iibellula distinguenda, Rambur, Névr. p. 81 (1842) (teste Ris) °. 
Libellula fervida, Erichs. in Schomb. Reisen Brit.-Guiana, iii. p. 584 (1848) °. 
Libellula justina, Selys, in Sagra’s Hist. Cuba, p. 450 (1857) *. 
Burmeister’s types, which I have described at length *, are rather young individuals. With advancing age the 
yellow of the body and wings becomes brown and reddish-brown. Before the completely brown thorax 
is reached, there is a stage when the sides of the thorax are darker above and below a longitudinal pale 
yellow or greenish-yellow band, 1-5-2 mm. wide, running the entire length of meso-metathorax as if in 
prolongation of the abdomen. A similar stage is known of Z. erichsoni?, g.v. Hagen has described °, 
as a “ very adult” male of this species, an individual from Surinam ; it had the ‘“ front chalybeous above.” 
For this reason, and because not a single specimen from Mexico or Central America (among the many 
recorded below) shows transitions to the colours of the Surinam male, I believe this male to be really 
unimaculata, De Geer. Even in young males of this latter the upper surface of the frons is metallic-blue. 
It is worthy of note that none of the material of ochracea is pruinose. 
The limits, to which the basal colouring on the wings extends, vary from the arculus to the third antenodal 
and middle of the internal triangle on the front wings, from the level of the third to that of the sixth 
antenodal on the hind wings, of the males. In the females, the same limits vary from the submedian 
cross-vein to the second antenodal and arculus on the front wings, from the origin of the distal subbasal 
sector (A, of C. & N.) to the fourth antenodal and distal angle of the triangle on the hind. Neither the 
extent of the colouring of the wings nor any other feature appears to vary in correlation with geographical 
distribution. 
One of Burmeister’s types has two post-triangular rows on the front wings from the triangle out®*. Singularly 
enough, not a single specimen in the present material shows such a peculiarity, even asymmetrically. 
The larger individuals of both sexes have three rows from triangle to nodus-level or beyond, the smaller 
have the formula3 .2.2.2.2.3...... or 3.3.2.2.2.38...... , but not infrequently one wing 
of an individual has one of these last two formule, the other wing has three rows uninterrupted; all 
these variations exist in the same locality and month (Teapa in April). 
Dimensions.— Abdomen, § 19-24°5, 2 18-28; hind wing, ¢ 23:5-29, 9 24-28°5; costal edge of stigma, 
front wing, 8-3-5 mm. The range of size in the April examples from Teapa is: abdomen, ¢ 21-245, 
@ 21-23; hind wing, ¢ 24°5-28°5, 2 26-28°5 mm. 
Hab. Mexico, Altamira (Hoag, coll. P. P. C.: 1 2) and Tampico® in Tamaulipas, 
Guadalajara (Schumann: 1 ¢), Acapulco (White, U. S. N. M.: 1 3), Atoyac (1. H. 
Smith: 9 3,3 2) in Vera Cruz (coll. Adams: 1 3), Frontera (coll. Westcott: 4 ¢) 
and Teapa (H. H. Smith: 30 3, 80 2) in Tabasco, Isthmus of Tehuantepec 
(Sumichrast, M. C. Z.: 1 9); Britise Honpuras, Rio Sarstoon (Blancaneaux: 3 3, 
29); Guatemana, Chacoj [1 ¢ ], Panzos [2 ¢, 4 2 ], and Teleman [1 ¢ ] in Vera 
Paz (Champion), Puerto Barrios [6 3,4 2 ], Los Amates [1 ¢ ], Escuintla [1 3 |, San 
José [17 ¢, 19 2]; Honpuras, Puerto Cortez [1 ¢ ], San Pedro Sula [33 ¢, 16 2 | 
(Deam, Williamson, Hine, colls. Wilmsn., O. S. U.); Nicaragua (U.S. N. M.: 4, 
5 2); Costa Rica, Bebedero (Underwood: 1 2); Panama, Colon (Howland, coll. 
Needham: 8 3,2 @).—Cotomsta, Ouriheka (Forel, coll. P. P.C., ex coll. Ris: 1 ¢), 
Choco 8 [Schott: 1 ¢ ]; VunezvELa® [Appun: 4 3] (M.C. Z.) (coll. P. BP. C., ex coll. 
Uhler: 1 3 with label “ Lib. fervida, Erichs.” in Hagen’s hand); Gurana?°([1 2, 
212 
