190SI 
Miittkoicski, Dragon Flies of Wisconsin. 
73 
above and below, black. Abdomen dark brown or black, 3 — 7 with nar- 
row pale basal rings, 8 — 10 bine, 
Female. — Brown or bine. Abdomen with dorsum black, 10 and half 
of 9 blue. 
Life Zone : Transition and Upper Austral, 
'I'ime and Habitat — June to September about shaded ponds and 
shores of streams. 
NEHALLENNIA Selys, Revue Odonates d'Eur., p. 172, 1850 ; Need- 
ham, Proc, U. S. Nat. Mus., 26, 710, 727, 1903 (Venation). 
Of this genus three species occur in the United States. They 
fly among the low sedge of river-banks, along sheltered brooks, 
often in thick masses. But one species, irene, has been taken in 
the State, though a second, posita, is known to occur westward as 
far as Missouri and is hkely to be found in Wisconsin, probably 
in the western portion of the state. The species are separated by 
their colors and the form of the posterior lobe of the prothorax. 
MALES. 
1. Colors blue and green 2 
Colors bronze, black and yellow posita 
2. Abdomen with 8—10 blue, with lateral green triangles irene 
Abdomen with 8 — 10 blue, with a black basal ring on 8. . . .gracilis 
FEMALES. 
1. Posterior lobe of prothorax emarginate 2 
Posterior lobe of prothorax rounded, medially produced posita 
2. Posterior lobe of prothorax notched once gracilis 
Posterior lobe of prothorax notched twice irene 
Nehallennia irene Hagen, Svn, Neur. N. Am., p. 74, 1861 ; Need- 
ham, P>ull. 68, N. Y. State Mus., p. 249, 1903 (Bibliography & Desc. of 
nymph) ; Needham, Proc. U. S. Nat. Mus., 26, p. 764, 1903 (Venation). 
Abd. male and female 21 ; h. w. male 13, female 14. 
]Male. — Color g-reen, marked with blue, yellow below. Abdomen 
with pale basal rings on 1 — 6, interrupted on dorsum of 3 — 6, basal half 
of 9 and apex of 8 blue, with lateral green tri- or rectangles. Inferior 
appendages longer than superiors. 
Female. — Differs from the male by having the 8th segment green. 
The blue is limited to 10 and an apical spot on 9. 
Life Zone : Upper Austral. 
Wisconsin: Milwaukee Co., June 16, 1899, July 17, 1902, June 14, 
1903. 
Time and Habitat — May to July about quiet waters. 
AMPHIAQRION SeH-s.^Bull. Ac. Belg. (2) 41, p. 284, 1876. 
A sing-le species is found in Wisconsin. 
Amphiagrion saucium Burmeister, Handbuch der Ent., 2, -p. 819, 
1839 (discolor & saucium) ; Hagen, Syn. Neur. N. Am., p. 79 & 85, 1861; 
Williamson, Ent. News, 11. p. 454, 1900 (ahhreriotum) ; Needham, Bull, 
68, N. Y. State Mus., p. 247, 1903 (Bibliography & Desc. of nymph). 
Abd. male 20, female 21 ; h. w. male 14, female 15. 
]Male. — Thorax and apical segments of abdomen black, basal seg- 
ments red. Abdomen with narrow basal pale rings on 1 — 7, and inter- 
