ERYTHRODIPLAX. 267 
Trithemis ambusta, Cockerell, Journ. Inst. Jam. i. p. 257 (1893) * ; Carpenter, 1. c. ii. p. 260 (1896) *. 
Libellula minuscula (pars), Ramb. Névr. p. 115 (1842) ° (teste Selys’). 
The outer limits of the basal spot on the hind wing, of Cuban specimens only, varies from the second ante- 
cubital, arculus, and proximal side of triangle to the fifth antecubital and one cell beyond the distal angle 
of the triangle. Antecubitals, hind wing, 6-7. See also a remark on this form, anted, page 259. 
Abdomen, ¢ 15-20, 2 15-5-18; hind wing, ¢ 17°5-23°'5, Q 20-22 mm. (Cuba). 
» 6 16-19,2915-17;  ,, 4 o 19-22, 2 18-22 mm, (Samana). 
Hab. Wusr Invies, Havana (Baker, coll. P. P.C.: 1 9) in Cuba 1-35 (Loew, Wright, 
Gundlach, Poey, M. C. Z., Am. Ent. Soc.: 28 3,9 9 ), Isle of Pines * (Poey, M.C. Z.: 
3 ¢), Kingston [Aaron: 1 ¢] and Bath [Mrs. Swainson®: 1 3] (coll. P. P. C.) in 
Jamaica® (A. NV. S.: 26, 12), Samana (Frazar, colls. M.C.Z., P. P.G.: 11 ¢, 
13 @) in Hayti (Uhler, M. C. Z.: 13,1 2; Abbott, A. N.S.: 28,1 2 ), Mayaguez 
(Barrett, coll. P. P. C.: 2 3) in Porto Rico, St. Thomas (Orsted, M. C.Z.: 1 3). 
Dr. Ris has written me (9. ix. 05) :—“ Erythrodiplax justiniana is identical with the 
ambusta [from Samana] you sent me; a specimen from Cuba under the general label 
Justiniana [in de Selys’s collection] is even labelled ‘ambusta’ in Hagen’s hand.” 
It will be interesting to look for this form in Yucatan, from which I have seen no 
material. The “mixed-fronted” male from Lumija mentioned on page 262 is suggestive 
of a connection between the continentals and this insular form. | 
Summary.—ln general, red-fronted forms are furnished by the eastern slopes of 
Mexico and Guatemala, while the western slopes of Mexico yield those with blue 
fronts. On the other hand, both red-fronted (e, d, e) and blue-fronted (b’) males were 
gathered at Teapa in Tabasco in the same month (February) of the same year, by the 
same collector, and in Costa Rica red-fronted males are reported from the western, or 
Pacific, slope (Surubres, e, e) as well as the eastern (Caché, d). In South America, the 
vicinity of Coroico in Bolivia has yielded both blue- (b/) and red- (c, e, f) fronted 
individuals at the same time of year. From Nova Friburgo and Rio in Brazil likewise 
come both colours of frons (d, e, a’, b’, e’). | 
The blue-fronted Western Mexican examples have been mainly taken from June to 
November, the red-fronted Eastern Mexican individuals from January to July, but the 
collections from Teapa and Coroico cited above, the Uruapan male (a’) taken in April, 
and the San José, Costa Rica, August males (e) appear to oppose an interpretation of 
these colour-differences as seasonal. 
It is evident that we as yet know too little of the exact distribution of these insects 
in space and in time of year to formulate more definite conclusions. 
7. Erythrodiplax minuscula. 
Libellula minuscula, Rambr. Névr. p. 115 (1842). 
Diplax minuscula, Hagen, Syn. Neur. N. Amer. p. 183 (1861)?; Proc. Bost. Soc. Nat. Hist. xv. 
p. 268 (1878)"; xvi. p. 363 (1874) 4 
