66 Bulletin Wisconsin Natural History Society. [Vol. 6, Nos. 1 — 2. 
They vary in body colors from blue to green, the wings from yel- 
low to black, the former color more common in the females. The 
males are without stigma on the wings, which is as often present 
as not in the females. Our northern species may be separated by 
the following table : 
1. Wiiig-s narrow, front and hind margins sub-parallel 2 
Wings widening, the hind margin rounded 4 
2. Wings uniformly colored, or clear 3 
Wings with the apical sixth black dimidiata 
3. Wings clear augustjpennis 
Wings yellowish amata 
4. Wings uniformly black or brown maculata 
Wings with the base clear, the apical third black aequabilis 
Calopteryx maculata Beauvois, Ins. Afr. Am., p. 25, 1805 ; Hagen, 
Syn. Neur. N. Am., p. 57, 1861 ; Needham, Bull. 68 N. Y. State Mus., p. 
224, 1903 (Biobliography and desc. of nj^mph) ; Needham, Proc. U. S. 
Nat. Mus., 26, p. 745. 1903 (Venation). 
Abdomen male 32 — 37, female 32 — 35, hind wing male 26 — 28, 
female 28—31. 
Male. — Colors blue or green, with black markings. Thoracic 
carina, humerals, and legs black. Wings from light brown to black," 
costa blue or green. Abdomen black below except on the ajDical seg- 
ments which are whitish. Appendages black, superiors forcipate, 
thickened apically, outwardly denticulated, an inner median tooth. 
Inferiors two-thirds as long. 
Female. — Similar. Wings usually of light brown, the stigma white, 
if present. Abdomen brown, the three apical segments with a white- 
mid-dorsal stripe. 
Life Zone : Transition, Upper and Lower Austral. 
Wisconsin : ^Milwaukee Co., June 1899 ; June 1902, 1903 ; Waukesha 
Co., June 1902. 1903 ; Door Co., Jacksonport, June 25—30, 1906 ; Vilas 
Co.. June 24—30, 1907 ; Washington Co., Little Cedar Lake, Aug. 1—15, 
1907. 
Time and Habitat — Over rippling streams from May to August. 
Calopteryx aequabilis Say, Journ. Ac. Sci. Phila., 8, p. 33, 1839 ; 
Hagen, Syn. Neur. Am., p. 58, 1863 ; Needham, Bull. 68 N. Y. State :S[us.. 
p. 223, 1903 (Bibligraphy & Decs, of nymph). 
Abd. male 38—40, female 37—38 ; h. w. male 30—32, female 32—33. 
^fale. — Metallic blue or green, resembling maculata in the white 
and black markings. The abdomen, however, is more slender and 
somewhat longer. Wings yellowish hj^aline, darkened to black on the 
apical third or fourth. 
Female. — Abdomen green, brown toward ti]). Wings apically 
lighter. Pterostigma narrow, white, not reticulated. 
Life Zone : Transition and Upper Austral. 
Wisconsin: ]Milwaiikee, Co.; Milwaukee Eiver, July, 1899, Julv 8, 
1902 ; Vilas Co., Divide, June 24-30, 1907 ; Washington Co., Little Cedar 
Lake, Aug. 1-15, 1907. 
Time and Habitat — June to August at river shores, 
Calopteryx dimidiata Burmeister, Handbuch der Ent., 2, p. S29, 
1839; Idem. 2, i^. 827, 1839 (C. apicalis Burm.) ; Hagen, Syn. Neur. 
