112 Bulletin Wisconsin Natural History Society. [ Vol. (3, JNos. 1 — 2. 
of the pronounced white color of the face and the short thick 
stigma upon the wings of the imagoes. 
1. Siibtriang'Ie of fore wings free ; small species, hind wings 
20—23 mm 2 
Subtriangle of fore wings usually of three cells; larger sx^ecies. 
hind wing 24 — 30 mm ! 3 
Males. 
2. Basal segments prninose, 6 and 7 with a narrow basal line. . .frigida 
Segments 2 — 7 with hastate spots, interrupted apically. . .hudsonica 
3. Segment 7 with a dorsal spot 4 
Segment 7 without a dorsal spot glacialis 
4. Segment 8 black on dorsum 5 
Segment 8 with a prominent dorsal spot borealis 
5. Segment 7 with a prominent red spot on dorsum : -intacta 
Segment 7 with a faint yellow line on dorsum proxima 
Fonales. 
2. Segment 2 with a prominent dorsal spot, 4 — 7 with spots de- 
creased to narrow bands posteriorily ......frigida 
Segments 2 — 7 with hastate spots, interrupted apically. . .hudsonica 
3. Dorsum of 8 black 4 
Dorsum of 8 with a prominent red spot borealis 
4. Markings on dorsum of 4 — 7 linear 5 
Markings on dorsum of 4 — 7 reduced (or obsolete) to small 
basal triangles glacialis 
5. Dorsal band interrupted at the apex, ending in a basal triangle 
on 7 intacta 
Dorsal band hardly covering the basal half of the segments .... 
proxima 
Leucorhinia hudsonica Selys, Revue des Odonates. p. 53, 1850 ; 
Hagen, Syn. Xeur. X. Am., p. 180, 1861 ; Hagen, Trans. Am. Ent. Soc, 17, 
p. 233, 1890. 
Abd. male 20—21, female 19—20; h. w. male 20—23, female 21—22. 
]\rale. — Colors yellow and black. Labium black, labrum creamer 
white. Face milky white. Thorax yellow, a broad mid-dorsal stripe 
divided by the yellow carina, humeral and lateral sutural marks, all 
of irregular shape, black or fuscous. Wings hyaline, nervure fuscous, 
the antecubitals of all wings yellow, stigma short, f nscons. costa yellow. 
Fore wings with a small area within the subeostnl and the median space 
fuscous or black. The hind wings have the fuscous in the subcostal and 
median s])ace extending farther, that of the latter reaching to the anal 
maroin of the wing, thereby forming a quite regular triang-le. Legs 
black. Abdomen black, yellow on sides of 1 and 2, a basal point on 3 ; 
dorsum with a continuous band of hastate spots on 2 — 7, interrupted 
apically, ending in a basal triang'ular spot on 7. Appendages black, 
the superiors cylindrical, thicker at the apex, the inferiors widening 
apically, with a broad shallow notch. 
Female. — Similar. Labium with the sides white, labrum entirely^ 
black. The band or dorsum of abdomen wider, stigma of wings a trifle 
longer. Vulvar lamina short, approximated, or divergent and the 
apices obtuse. 
