110 Bulletin Wisconsin Natural History Society. [Vol. 6, Nos. 1 — 2. 
segments 4 — 8, turning into an even band on 9 — 10. Appendages bright 
yellow or red. 
Female. — Abdomen with the lateral spots continuous. Legs with 
all the femora olive beneath. 
This species is usually considered as a variety of ruhicundulum. 
In fact, the genital organs of both male and female of the two species 
are identical. Except for the yellow area of the wings there is no 
specific difference. 
Life Zone : Transition and Upper Austral. 
Wisconsin: Milwaukee Co., Aug. 1900, July 10-Aug. 8, 1902, July 7- 
Sept. 15, 1903. 
Time and Habitat — July to September in marshes and woods. 
Sympetrum rubicundultim Say, Journ. Ac. Phila. 8, p. 26, 1839 ; 
Hagen, Syn. Keur. N. Am., p. 176, 1861 ; Needham, Bull. 47 N. Y. State 
Mus., p. 524, 1901 (Bibliography). 
Abd. male 28, female 24 — 26; h. w. male 30, female 26 — 28. 
Male. — Color yellow in young' specimens, adults red. Face pink or 
yellow, an olive band below the frons. Thorax reddish, covered with 
pile, legs black, fore femora green beneath. Wings hyaline, the base 
filled with bright j'ellow, nervure black, stigma reddish, costa yellow. 
Abdomen yellow to red, sides of 3 — 9 with black spots. Appendages 
yellow or reddish. Genital hamule bifid, the branches equal in length, 
the exterior slender, acute, the interior triangular. 
Female. — Similar. Abdomen with more black on the sides, all 
femora yellow beneath. Vulvar lamina approximated at the base, the 
points divergent. 
Life Zone : Transition and Upper Austral. 
Wisconsin : Dane Co.. June 1890 ; Milwaukee Co., June 6-Aug. 3, 
1900, Aug. 3, 1901, June 22-July 22, 1902, July 10-27, 1903, Aug. 27, 1904, 
July 15-Sept. 1, 1907. 
Time and Habitat — June to September in woods and moist places. 
Sympetrum obtrusum Hagen, Stettiner Ent. Zeit. 28, p. 95, 1867 ; 
Needham, Bull. 47 N. Y. State Mus.,, p. 525, 1901 (Bibliography). 
Abd. male 24 — 27, female 23 — 24 ; h. w. male 25 — 26, female 24 — 25. 
Male. — Yellow to red. Face of young specimens olive, of adults ' 
whitish. Thorax and body yellow to red, marked similar to ruhicun- 
dulum. Legs black, fore femora yellow beneath, "^ilie yellow area of 
the wings is smaller than that of its ally. The genital organs are 
decidedly different from ruhicundulum, as indicated by the tabella. 
Female.— Usually of an olive brown color with a reddish tinge. 
This olive color separates it from ruhicundulum, which it resembles, 
by the form of the vulvar lamina. 
Life Zone : Transition and Upj)er Austral. 
Wisconsin : Milwaukee Co., June- July, 1899, June- July, 1900, Aug. 
3, 1901, Jane 22, 1902, July 21-27, 1903, July 15, 1905. 
Time and Habitat — Lakes and rivers June to October. 
Sympetrum semicinctum Say. 
Marked like other species in colors ranging from yellow to red. 
In the yellow of the wings it resembles assimilatum, but it is much 
smaller, the abdomen measuring but 20 mm. and the hind wing 23 mm. 
The genital organs of the male resemble those of viciuum, but the 
female differs by having the vulvar lamina short, broad, with a straight 
