]]4 Bulletin Wisconsin NaturaJ' History Society. [Vol. 6, Nos. 1 — 2. 
Male. — Black, marked with yellow. Labium black, sometimes with 
a yellowish brown spot at the sides, labrimi creamy white, face milky 
white. Thorax yellowish brown, an irregular mid-dorsal stripe divided 
by a yellow carina, antehnmeral, and the lateral sutures, black. Legs 
black. Wings hyaline, nervure black, stigma fuscous, costa brown. 
Abdomen black, the first segments chiefly yellow or orange, becoming 
blackened in older specimens, dorsal marks at the base of 4 — 7, obsolete 
in adults, but the round spot on 7 is always prominent and of a bright 
red or orange. Appendages black, the superiors cylindrical, the in- 
feriors shorter, bifurcate. 
Female. — Usually greenish yellow or bright orange, rarely black 
like the male. The labrum black only in the middle, the labium yellow, 
face whitish. Thorax brighter yellow than the male, the black mark- 
ings more regular. The wings with the fuscous spots of the base sur- 
rounded by yellow, nervure fuscous. Abdomen with segments 1 — 3 
largely j^ellow or orange, 4 — 7 with dorsal hastate spots. Vulvar la- 
mina short, the two lobes widely separated, slender, the apices acute. 
Life Zone : Boreal and Transition. Also found in parts of the 
Upper Austral. 
Wisconsin: Dane Co., June 1890, May 25, 1902; Milwaukee Co., 
June 14, July 20, 1903; June 8-18, 1906; Door Co., Jacksonport, June 
26, 1905. 
Time and Habitat — Lakes and marshes June to July. 
PACHYDIPLAX Brauer, Verb. Zool. Bot. Gesellsch. Wien, 18, p. 368, 
722, 1868 ; Needham, Proc. U. S. Nat. Mus. 26, p. 710, 726, 727, 1903 (Ve- 
nation) . 
A genus of a single species possessing in part the attributes 
of Leucorhinia, such as the white face. It differs, however, in 
other respects, the longer stigma of the wings, and the base of the 
wings free of black markings. 
Pachydiplax longipennis Burmeister, Handbuch der Ent. 2, p. 850, 
1839; Needham, Proc. U. S. Nat. Mus. 26, 763, 1903 (Venation). 
Abd. male 24—26, female 23— 25 ; h. w. male 29—30, female 31. 
Male. — Mouths parts creamy white, face milk-white. Frons above 
and, vertex steel blue. Thorax fuscous, antehumerals, humerals and 
three ijateral stripes olive. Leg's black, fore femora green beneath. Wings 
hyaline, nervure black, pterostigma fuscous, costa black. Wings yellow 
at base, the hind wings with a larger area of darker yellow at the 
anal niargin. Hind wings of other specimens with a fuscous streak in 
the sub-costal and median spaces. Abdomen black, a yellow or green 
stripe on each side of the dorsum of 2 — 7, sides 1 — 3 largely yellow, 4 — 5 
with a basal streak. Appendages black. Adult males usually become prui- 
nose between the wings on the sutures, on the dorsum of the abdomen 
to the fifth segment inclusive and on the venter to the apex. Such 
specimens may ^Iso h^'Ve the postnodal area of the wings dusky. 
Female. — Similar to the fully colored male. Earely pruinose. The 
females have less yellow at the base of the wings and no basal fus- 
cous streams. The vulv^,r laniina consist of two short, rounde^, widely 
^iverge^nt lobes. 
