SYMPETRUM. 323 
In most of the examples from Arequipa, and in some of those from Colombia, a small yellow cloud at the 
nodus of all the wings is well-marked ; in other specimens it is less distinct. The blackish subcostal 
streak of the hind wings of the Arequipa males and females frequently extends to the level of the arculus. 
Hab. Lowrr Cauirornia, Mesa Verde?.—Cotompia 13 [3 3, 1 2; Moritz: 3 ¢ |, 
Sta. Fé de Bogotdé [Lindig, 1863: 236,192] (M. C. Z.); Vunezuetal?; Britisu 
Guana, Mt. Roraima, 8600 ft.5; Ecuvapor, Quito 13 [Campos R.: 34,12 ], Cuenca’; 
Perv, Arequipa [Gerhart: 6 ¢, 10 9] (A. M S.); Argentina, Cordova (M. C. 
Z.: 13). 
Taken in June at Quito, in October at Mesa Verde and Arequipa. 
Although one of the Colombian males bears a label “ L. virgula” in de Selys’s hand, 
it is certainly gilvum. 
Gilvum is surely to be found in our faunal district. | 
2. Sympetrum corruptum. 
Mesothemis corrupia, Hagen, Syn. Neur. N. Amer. p. 171 (1861)'; Ann. Rep. U.S. Geol. & Geogr. 
Surv. Terr. (Hayden’s) 1872, p. 728 (1873)7; 1873, p. 587 (1874) °; (Wheeler’s) v. Zool. 
p. 919 (1875)*; Proc. Bost. Soc. Nat. Hist. xviii. p. 77 (1875)°; Walsh, Proc. Acad. Nat. 
Sci. Philad. 1862, p. 400°. 
Diplax corrupta, Selys, Ann. Soc. Ent. Belg. xviii. p. 43 (1884)*; Banks, Trans. Amer. Ent. Soc. 
xix. p. 356 (1892)*; Ent. News, v. p. 179 (1894)°; Calvert, Trans. Amer. Ent. Soc. xx. 
p. 264 (1893)'°; Proc. Calif. Acad. Sci. (2) iv. p. 545, t. 17. figg. 120-123 (details $ ? ) 
(1895)"; Journ. N. Y. Ent. Soc. v. p. 95 (1897); Kellicott, Journ. Cincinn. Soc. Nat. 
Hist. xviii. p. 109 (1896) **; xix. p. 70 (1897) *; Odon. Ohio, p. 111 (1899); Van Duzee, 
Journ. N. Y. Ent. Soc. v. p. 91 (1897) *; Elrod, Ent. News, ix. p. 10 (1898) ”. 
Sympetrum corruptum, Williamson, 24th Rep. Geol. Indiana, p. 324 (1900) "*; Ent. News, xi. 
p. 458 (1900); xiv. p. 229 (1908) *; Proc. Indiana Acad. Sci. 1901, p. 120%; Adams, 
Ent. News, xi. p. 622 (1900) *; Howard, Insect Book, t. 42. fig. 5 (entire insect) (1901) ”; 
Calvert, Trans. Amer, Ent. Soc. xxix. p. 43 (1902); Ent. News, xiv. p. 36 (1903) *; Currie, 
Proc. Ent. Soc. Wash. v. p. 303 (1903); vii. p. 19 (1905) 7; Needham, Bull. 68 N. Y. St. 
Mus. p. 271, figg. 16, 17 (details nymph) (1903) *; Osburn, Ent. News, xvi. p. 195 (1905) *. 
I have not a sufficient number of specimens from any one locality in the northern United States to determine 
what the range of size may be, but the following dimensions (in mm.) from more southern situations 
may serve for future comparisons :— 
Round Mt., _| Florence, Ariz. Las Bocas, Tlalnepantla : Oaxaca : 
Texas (10d ¢).| (45,89). Durango: Aug. Sept. June. 
Abdomen, 3 ...... 26-29 24-25 25°5-26°5 26-29 25 
a tees a 25-27 93-524 25-29 26 
Hind wing, g ...... 30-32 29-30 30-31 30-82°5 28:5 
oe Qe ee es vee 28:5-31:5 28-30 29-33 30 
The largest individual is the male from Rio Hondo (abd. 30, h. w. 33 mm.); the shortest wing-lengths are 
296-5 mm. ¢ 2 from Mexico City, but the abdomens of these are no shorter than indicated by the lowest 
figures given in the table above. 
I have been unable to find any geographical variations. Kellicott*® and Messrs. Van Duzee'* and Williamson 
have called attention to the colour-changes accompanying age. 
