ERYTHEMIS, 331 
FF, Thorax and first two abdominal segments green, remainder of abdomen 
red; female with a small, isolated, brownish antehumeral line, diverg- 
ing from its fellow of the opposite side, and the sutures and apices of 
the abdominal segments blackish ; hind wings with a reddish- (¢) or 
yellowish- (2?) brown basal spot reaching outward to the submedian 
cross-vein and half-way to the first antecubital ; vulvar lamina project- 
ing 5mm. Abdomen, ¢ 34°5-37, 9 35°5-38; hind wing, ¢ 35-39, 
989mm... 1. 1 ee we we ek ke ee 6. hematogastra. 
[AA. Front wings with two post-triangular rows for at least part of the field 
proximal to the nodus; hind wings with two rows of cells between the 
proximal subbasal sector (A;) and the hind margin, usually with 1-3 single 
post-triangular cells reaching across the entire width of the field from short 
sector to first sector of the triangle; abdomen rather stout. Thorax luteous 
or yellow, a broad blackish antehumeral stripe each side, so that black 
predominates on the dorsum, width of pale colour remaining between the 
antehumeral stripes ] mm.; abdomen luteous with a mid-dorsal blackish 
stripe on segments 4—9, in older males ‘ subpruinose with the base fuscous ” 
(Hagen), in still older males the whole body is pruinose ; basal spot of hind 
wings yellow, reaching out to the submedian cross-vein; vulvar lamina 
projecting ‘1-2 mm. Abdomen, ¢ 25-28, 9 24-26; hind wing, ¢ 27-30, 
9 28-30mm. . . 2. 1 we we ee ee ee ee ee ee redulaa..] 
1. Erythemis simplicicollis. 
a. simplicicollis type. 
Libellula simplicicollis, Say, Journ. Acad. Nat. Sci. Philad. viii. p. 28 (1839) *. 
Mesothemis simplicicollis, Hagen, Syn. Neur. N. Amer. p. 170 (1861)*; Proc. Bost. Soc. Nat. 
Hist. xviii. p. 77 (1875) °; Kirby, Trans. Zool. Soc. Lond. xii. t. 57. figg. 4 (venation), 4a 
(8rd leg) (1889) *; Calvert, Trans. Amer. Ent. Soc. xx. p. 265 (1893)°; Carpenter, Journ. 
Inst. Jamaica, ii. p. 260 (1896)°; Kellicott, Odon. Ohio, p. 113 (1899)7; Williamson, 
24th Rep. Geol. Indiana, p. 325 (1900)°; Burnham, Proc. Manchester (N. H.) Inst. Arts & 
Sci. i. p. 88 (1900)°; Howard, Insect Book, t. 41. figg. 8,9 (¢ 2?) (1901); Needham, 
Bull, 47 N. Y. St. Mus. p. 527 (nymph) (1901); Proc. U.S. Nat. Mus. xxvi. t. 45. fig. 3 
(venation) (1903) ”; Butler, Trans. Amer. Ent. Soc. xxx. p. 125, t. 6. fig. 5g (labium of 
nymph) (1904) **. 
Erythemis simplicicollis, Calvert, Occas. Papers Bost. Soc. Nat. Hist. vii. 6, p. 4:2 (1905) “. 
Libellula cerulans, L. maculiventris, Ramb. Névr. pp. 64, $7 (1842) ». 
-Mesothemis gundlachii, Scudder, Proc. Bost. Soc. Nat. Hist. x. p. 195 (1866) ”*. 
Some additional references are given by Hagen*; some others of later date, not adding to but merely 
confirming our previous information, are omitted. 
Certain specimens before me, all with the green of thorax and abdomen clear and distinct, show more black 
markings on the thorax than is commonly to be found in this species. A male from Altamira and one 
from Florida have black lines on the following parts: mid-dorsal carina, upper part of mesepisternum 
(about 1:5 mm. long), humeral, obsolete first lateral (above the metastigma), and second lateral sutures. 
A second male from Altamira adds to these a small blackish streak on mes- and metepimera at about one- 
third height ; in a second male from Florida, these two streaks are heavier and longer (1-2 mm.). One 
