1908] Muttkowski, Dragon Flies of Wisconsin.. 75 
12. Seg-ment 8 entirely blue 13 
Seg-ment 8 with a black basal spot traviatum 
13. Segment 7 with a basal ring of black aspersum 
Segment 7 entirely black piscinarium 
14. Thorax g'reen or blue, and black 15 
Thorax orange or yellow, and black 17 
15. Dorsum of 8 black 16 
Dorsum of 8 blue divagans 
16. Face green or blue exsulans 
Face yellow or orange antennatum 
17. Segment 9 yellow signatum 
Seg-ment 9 blue pollutum 
A further table refers exclusively to the females of such species 
that have been taken in Wisconsin or are likely to be found. As 
supreme criterion I selected the form of the posterior lobe of the 
prothorax, which seems to be a quite constant character. Accord- 
ingly the species are divided into three groups, each group sub- 
divided according to colors of the thorax and the abdomen. Even 
so the grouping is only tentative and may not be practical, since 
little latitude is permissable in a table as regards the darkened 
colors of aging specimens : 
Group 1: Protho7~aa' witJi posterior Johc rounded. 
(a) Thorax yellowish green and black; dorsum of abdomen 
black. 
Segments 3 — 7 with pale basal interrupted rings civile 
(Not distinguishable from civile) caruncuiatum 
(b) Thorax yellowish green and black; dorsum of abdomen 
green basal rings on 2 — 7 pale ebrium 
(c) Thorax blue and black; abdomen black 
Segment 8 with a mid-dorsal black spot caiverti 
Segment 8 with a lateral blue spot geminatum 
(d) Thorax green and black; abdomen black dorsally. 
Segments 3 — 7 with pale basal rings hageni 
(e) Thorax orange and green; dorsum of abdomen black, 
yellow or blue. 
Segment 9 with black ascending to mid-dorsal apex, .signatum 
Segment 9 apically, 10 entirely yellow or blue pollutum 
Group 2: Prothorax until posterior lobe laterally si(l)-excise'd:. 
(a) Thorax blue and black; dorsum of abdomen black. 
Dorsal stripe narrowed on 7 — 8 aspersum 
Group 3 : Prothorax with « tnhercle on the posterior lobe. 
(a) Thorax green and orange; dorsum of abdomen green. 
Segment 10 and apex of 9 blue exsulans 
(b) Thorax green and orange; dorsum of abdomen black, with 
yellow or blue. 
Segment 10 mostly blue. . , antennatum 
Enallagma caruncuiatum Morse, Psyche, 7, p. 19, 1895 ; Needham, 
Bull. 68. N. Y. State Mus., p. 255, 1903 (Bibliography & Desc. of nymph). 
Abd. male 25, female 26 ; h. w. male 19, female 20. 
JNIale. — Color blue, with black markings. Abdomen blue, an apical 
