26 NEUROPTERA. 
possessed pairs taken in coitu, I have sought some other way of differentiating this sex. 
Mr. Rhoads captured 13 ¢ and 26 @ Hetwrine at Uruapam: all the males were 
referable to H. vulnerata, and it was therefore highly probable that some of the females 
belonged to the same species. A study of them gave no grounds for believing that the 
twenty-six were not specifically identical. Mr. Rogers sent 20 3 H. cruentata from 
Caché, but no 3o H. vulnerata; 16 from that locality, evidently all of the same 
species, were therefore more likely to belong to H. cruentata than to HA, vulnerata. 
A comparison of the Caché females of H. cruentata with the Uruapam females of 
H. vuinerata gives only this difference between the two :— 
H. vulnerata, 2. Metallic green stripe on either side of the mid-dorsal thoracic carina curving outward at its 
upper end to form a hook-like prolongation in front of the ante-alar sinus, the apex of the hook directed 
forward and filling the depression at the upper end of the humeral suture. 
H. cruentata, 2. No such hook-like prolongation, the metallic green stripe not reaching to the humeral 
suture. (Cf. Tab. IIT. figg. 18, 19.) 
No other distinguishing feature was constant in the two groups of females mentioned, 
although all the characters named in the ‘ Monographie,’ as well as others not considered 
therein, were tested for the purpose. On the basis of this single difference the females 
of these two species have been identified. 
It may be mentioned here that the dark stripes (usually metallic green) on the sides 
of the thorax of H. vulnerata may occasionally almost (Santa Maria, @ ), or entirely 
(Cuernavaca, @ ), disappear. 
4, Heterina americana. (Tab. II. figg. 1-17.) 
Agrion americana, Fabr. Ent. Syst., Suppl. p. 287 (1798) *. 
Heterina americana, Selys, Syn. Calopt. p. 41 (1853)*; Monogr. Calopt. p. 131, t. 12. fig. 3 
(apps. d) (1854)°; Bull. Acad. Belg. (2) xxxv. p. 480 (1873)*; Hagen, Proc. Bost. Soc. Nat. 
Hist. xviii. pp. 23, 28 (1875) °; Kirby, Cat. Odon. p. 106 (1890) °; Calvert, Proc. Calif. Acad. 
Sci. (3), Zool. i. p. 372 (1899)"; Howard, Insect Book, t. 46. figg. 9 (3), 11 (2) (entire 
insects) (1901) *. 
Agrion basalis, Flint edit. Harris, Treat. Ins. Inj. &c. t. 1. fig. 2 (entire insect, poor) (1862) °. 
Heterina basalis et H. californica, Selys, Bull. Acad. Belg. (2) vii. pp. 441, 440 (1859) ; Hagen, ~ 
Syn. Neur. N. Am. pp. 59, 60 (1861) 4 Kirby, Cat. Odon. p. 106 (1890) ™. 
Heterina californica, Calvert, Proc. Calif. Acad. Sci. (2) iv. p. 473 (1895) *, 
Heterina terana et H. scelerata, Walsh, Proc. Ent. Soc. Philad. ii. pp. 227, 267 (1863) “; Hagen, 
Proc. Bost. Soc. Nat. Hist. xviii. p. 24 (1875); Kirby, Cat. Odon. pp. 105, 106 (1890) **. 
Hab. Canava, Montreal (Lyman, M. C.Z.: 19); Unirep States, Maine to Maryland, 
west to Kansas (Banks, 1894), Arkansas (Adams, 1900), Colorado’*, Montana ™, 
California 3, Tucson in Arizona (MZ. C. Z.: 14,12), Pecos River (MC. Z.: 1¢, 
12), Round Mountain (Schaupp, colts. A, N.S. and P. P.C.: 83, 4 2); San 
Antonio [1 2] and Uvalde in Texas [1 9 ] (Dr. Palmer, M. C. Z.) ; Lowsr Ca.irornia, 
Comondu!3.—Mexico, Nuevo Laredo [1 ¢? ], Victoria in Tamaulipas [3 ¢ |, Linares in 
