SYMPETRUM. 
The three local races or forms distinguished by de Selys? differ as follows :— 
Wings yellow along the 
anterior margin 
Blackish basal streak in 
subcostal space, front 
wing 
Blackish basal streak in 
subcostal space, hind 
wing 
Blackish basal streak in 
submedian space, hind 
wing 
Apex of inferior append- 
age, ¢, viewed from 
below 
illetum type. 
as far as nodus or more 
remote. 
to beyond first ante- 
cubital. 
to second antecubital. 
to submedian cross-vein. 
one-half to one-third as 
wide as at base, sub- 
equal in width to 
superior appendage at 
same level. 
virgulum. 
as far as the nodus. 
to one-fourth way to 
first antecubital. 
nearly to first ante- 
cubital. 
to one-third way to sub- 
median cross-vein or 
less. 
one-fourth as wide as at 
base, not as wide as 
either superior append- 
age at same level. 
321 
giluum. 
as far as the triangle 
or less, and only in 
the subcostal and sub- 
median spaces. 
none. 
hardly to first ante- 
cubital, or less. 
none. 
one-half to one-third as 
wide as at base, wider 
than, or subequal in 
width to, either supe- 
rior appendage at 
same level. 
I have been unable to find any constant venational differences between these three forms, even excluding the 
intermediate examples. De Selys says? that the reticulation of gilvwm is blacker than in the other 
forms, but I cannot see that such is the case with the present material. 
[i. S. illotum type. 
? Diplax illota type, Selys, J. c. p. 44 (1884) *. 
Mesothemis illota, Hagen, Aun. Rep. U.S. Geol. & Geogr. Surv. Terr. (Hayden’s) 1873, p. 587 
(1874) °; Proc. Bost. Soc. Nat. Hist. xviii. p. 78 (1875) °. 
Sympetrum illotum, Needham, Outdoor Studies, figg. 68-70 (nymph) (1898)7; Bull. 47 N. Y. St. 
Mus. p. 429, fig. 6, t. 25. fig. 1 (aymph) (1901)*; Bull. 68, ibid. p. 272 (1903) °; Osburn, 
Ent. News, xvi. p. 195 (1905) *°. 
Abdomen, ¢ 23°5-26°5, 9 22; hind wing, ¢ 23-31'5, 2? 28°5 mm. 
Hab. Britis Couumsta, Victoria ® 1, Gulf of Georgia®, Shawnigan Lake 1°; Unirep 
Srates, Seattle 1° in Washington, Astoria (coll. Westcott: 3 3) in Oregon, Yellow- 
stone >, Mendocino® to San Diego® (Kellogg, Davidson, Truman, Grinnell, Baker) in 
California 14, Nevada 4. 
Hagen} reported this species also from Ajan, Sea of Ochotsk, but de Selys? has 
doubted the identification. | 
ii. S. illotum virgulum. 
? Diplax illota, form virgula, Selys, 1. ¢. p. 44 (1884) ™. 
Sympetrum illotum, Calv. Proc. Calif. Acad. Sci. (3), Zool. i. p. 401 ( 
1899) *. 
The dimensions of the examples taken in September at Amula are here given, as they exhibit the range of size 
for this form very well: abdomen, g 22-26, 9 22-24°5; hind wing, ¢ 26-30, 9 27-29 mm. 
Hab. Lowzr Catirornia, Mesa Verde 3, Sierra Laguna *.—Mexico (coll. McLachlan: 
