HETARINA. 29 
_ The pterostigma is represented only by a single, thickened, more oblique postcubital 
on both hind wings of the male, and in one female from Durango and in one hind 
wing of a female from Acambaro (where, however, its absence seems to be due to an 
abnormality in the development of the reticulation). Its absence has been noted !? in 
specimens from Comondu, Lower California. According to our existing knowledge, 
California (U.S.A.) is the only region where both the pterostigmatous and aptero- 
stigmatous forms of H. americana occur !*, In all the other material from our faunal 
limits the pterostigma is present, and varies in length, surmounting from one to three 
cells. In the males its colour is yellow in the young, blackish in the old, seeming 
to darken simultaneously with the darkening of the yellow areas of the thorax. It 
never becomes so dark in the females as in the males. 
The variations above described in the extent of the basal red spots and of the ptero- 
stigma are in contrast to the statement of de Selys+, who wrote of the Mexican and 
Guatemalan individuals which he studied :— Je n’ai vu de variation, ni dans l’étendue 
des taches basales qui vont jusqu’é mi-chemin de la base au nodus, ni dans les dimen- 
sions du ptérostigma.” See also the data which are summarized in the footnote, anted, 
p. 27. 
De Selys? and Hagen® note that there is no good reason for believing. that this 
species also occurs in South America. 
5. Heterina sempronia. 
Heterina sempronia, Selys, Syn. Calopt. p. 45 (1853)'; Monogr. Calopt. p. 147, t. 12. fig. 7 
(apps. ¢ ) (1854) ?; Bull. Acad. Belg. (2) xxv. p. 482 (1873) °; Walker, List Neur. Ins. Brit. 
Mus. iv. p. 682 (1853)*; Hagen, Syn. Neur. N. Am. p. 62 (1861) °; Proc. Bost. Soc. Nat. 
Hist. xviii. p. 24 (1875) °; Kirby, Cat. Odon. p. 107 (1890) ”. 
Hab. Untrep States (?t), “probably St. Antonio, Texas” ®&,—Mexico?, Vera Cruz, 
Putla (fide Selys?), Teapa in Tabasco (H. H. Smith: 2 3); Panama, Chiriqui (coll. 
McLachlan: 1 8 ).—Cotomsta, Bogota °. 
6. Heterina tricolor, (Tab. III. figg. 1, 20.) 
Calopteryz tricolor, Burm. Handb. d. Ent. ii. p. 827 (1839)*; Calvert, Trans. Am. Ent. Soc. xxv. 
p. 48 (1898) *. | 
Heterina tricolor, Selys, Syn. Calopt. p. 42 (1853) *; Monogr. Calopt. p. 136, t. 12. fig. 5 (apps. 3) 
(1854) *; Walker, List Neur. Ins. Brit. Mus. iv. p. 629 (1853) °; Hagen, Syn. Neur. N. Am. 
p- 61 (1861) °; Proc. Bost. Soc. Nat. Hist. xviii. p. 24 (1875)"; Kirby, Cat. Odon. p. 106 
(1890) °; Calvert, Trans. Am. Ent. Soc. xx. p. 229 (1893) °; Kellicott, Odonata Ohio, p. 13 
(1899) *°; Williamson, 24th Rep. Dept. Geol. Indiana, p. 255 (1900) "'; Howard, Insect Book, 
t. 46. fig. 19 (3 entire insect) (1901)”. 
Syn.? Heterina macropus, Selys, Monogr. Calopt. p. 142 (1854) (? only)”. 
Hab. Unitep States, Philadelphia 1, Ohio 1°, Indiana", Tennessee (Williamson, in 
