118 Bulletin Wisconsin Natural History Society. [Vol. 6, Nos. 1 — 2. 
Libellula basajis Say, Journ. Acad. Nat. Sci. Phila. 8, p. 23, 1839 ; 
Needham, Bull. 47, N. Y. State Mus., p. 532, 1901 (Biblography & desc. 
of nymph). 
Abd. male 28—32, female 28 ; h. w. male 39—42, female 37—29. 
Male. — Color dark brown. Face black, a brown band below the 
frons. Thorax reddish, lig-hter at the mid-dorsal carina, a black 
humeral and lateral irregular marks on the sutures. Sides tinged with 
yellow. Legs black. Wings with the basal half or third fuscous, lighter 
at the base, milk-white beyond the fuscous area to the nodus. Stigma 
and costa black. Abdomen with a black mid-dorsal band flanked on 
each side by a yellow stripe which is blackened in older specimens. 
Female. — Face light brown. Thorax brown above, a mid-dorsal 
stripe of yellow, humerals and lateral sutures irregularly marked with 
fuscous. Sides largely yellow. Legs dark brown, fore femora yellow 
beneath. Wings with a smaller fuscous area than the male, the apices 
of all wings inf uscated. No white area beyond the fuscous. Abdomen 
flattened, dilated, yellow, a fuscous mid-dorsal stripe flanked by yellow 
stripes which in turn are bounded by fuscous stripes. 
Life Zone : Transition and Upper Austral. 
Wisconsin: Waukesha Co., Nagowicka Lake, June 1898; Milwau- 
kee Co., July 1, 1900, July 10, Aug. 10, 1903 ; Dane Co., June 7, 1900 ; 
June 1890 ; Washington Co., Cedar Lake, Aug. 15, 1906. 
Time and Habitat — Lake shores June to September. 
Libellula incesta Hagen ; Syn. Neur. N. Am., p. 185, 1861; Need- 
ham, Bull. 47, N. Y. State Mus., p. 533, 1901 (Bibliography). 
Abd. male 36—39, female 32—34 ; h. w. male 40— 44, "female 39—40. 
Male. — Color reddish brown, overlaid with purple in older speci- 
mens. Face black, a luteous band below the 20, mouth parts yellow. 
Thorax with a light mid-dorsal stripe, sides largel3^ yellow, irregularly 
marked with black near the legs. Legs black, coxa and trochanters 
yellowish, anterior femora yellow beneath. Wings hyaline, clear, the 
apices inf uscated, nervure and costa black, stigma dark brown. The 
nodus of the wings faintly tinged with fuscous. Abdomen with the 
basal segments largely brown or luteous, a mid-dorsal band of black 
flanked by two yellow stripes. The appendages black. These markings 
disappear in older specimens, which become pruinose. 
Female. — Usually with more yellow than the male, the markings 
at least translucent through the black of age. Karely pruinose. 
Life Zone : Occurs everywhere in the Transition and Austral 
areas. * 
Wisconsin : Milwaukee Co., June 1900. 
Time and Habitat — Lake shores June to September. 
Libellula vibrans Fabricius, Ent. Syst. 2, p. 380, 1793 ; Needham, 
Bull. 47, N. Y. State Mus., p. 533, 1901 (Bibliography). 
Abd. male 42, female 41 ; h. w. male 48, female 49 — 50. 
Male. — Colors yellow and brown. Face olive, the mouth parts 
yellow, margined with black. Thorax above brown, black at the an- 
terior edge, a mid-dorsal stripe of j^ellow, a black band on the upper 
half of the humeral suture, sides yellow, black near the legs. Legs 
black, the femora brown at the base. Wings hyaline, nervure, costa 
and stigma black, the sub-costal space up to the third antecubital, a 
small spot on the outer side of the nodus and the extreme apex of the 
