1908] Muttkoivski, Dragon Flies of Wisconsin. 116 
Life Zone : Upper and Lower AustraL 
Wisconsin: Milwaukee river, June 1890; July 6, Aug-. 1, 1900; 
Jul3^ 7, Aug. 10, 1903. 
Time and Habitat — Lakes and marshes May to August. 
MESOTHEMIS Hagen, Svn. Neur. N. Am., p. 170, 1861; Xeedham, 
Proc. U. S. Nat. Mus. 2G, p. 718, 719, 1903 (Venation). 
Two species are referred to this genus. 
1. Males 2 
Females 3 
2. Superior appendages yellow simplicicollis 
Superior appendages black collocata 
3. Apical black spots on segments 4 — 10 linear, or wanting. .coHocata 
Apical black spots on segments 4 — 10 quadrangular, .simplicicollis 
Mesothemis simplicicollis Say, Acad. Nat. Sci. Phila. 8, p. 28, 1839 ; 
Hagen, Syn. Neur. N. Am., p. 170, 1861; Needham. Pull. 47, N. Y. State 
Mus., p. 527, 1901 (Pibliography & desc. of nymph) ; Needham, Proc. 
U. S. Nat. Mus. 26, p. 763, 1903 (Venation). 
Abd. male 29—32, female 27—32; h. w. male 32—34, female 31—35. 
Male. — Olive or green, marked with black. Face olive, thorax of the 
same shade, the lateral sutures with isolated black or brown marks. 
Legs black, fore femora green beneath, hind femora with six and tibiae 
with about ten long spines laid in two rows. Wings hyaline, clear, 
stigma light brown, costa olive. Abdomen olive or greenish yellow, 
all the sutures ringed with black, black spots on the apical half of seg- 
ments 4 — 9. This description applies to young males only. As the 
imagoes grow older the yellow of the abdomen is overshadowed with 
black beginning with the apical segments. Full grown specimens be- 
come blue pruinose over the whole body, except for the apical segments 
of the abdomen which remain black and the yellow appendages. 
Female. — Fore femora entirely olive or yellow and with an external 
black stripe. All other femora olive externally. Abdomen with more 
yellow. Vulvar lamina triangular, erect, seen as a nearly perpendi- 
cular process from the venter. 
Life Zone : Upper and Lower Austral. Also in tropical regions. 
Wisconsin : Dane Co., July 10, 1901, Aug. 20, 1900 ; Town Franklin 
and Milwaukee river, July 17. 1902, Aug. 10, 1903. 
Time and Habitat — June to September in open places along water. 
MICRATHYRIA Kirby, Trans. Zool. Soc. London, 12, p. 303, 1889. 
This genus includes five or six species, of which a single one is 
found outside of the tropical zones. Micrathyria herenice has 
been taken in Austral regions, chiefly along the Atlantic coast, 
and but rarely westward from the ocean strip. The imago re- 
sembles the preceding species, the adults are black or pruionse, 
and if not, the markings are yellowish brown on a black back- 
ground. 
LADONA Needham, Can. Ent. 29, p. 144-146, 1897. 
Three species are referred to this genus by Prof. Needham. 
The genus Ladona was separated from Lihelhda and erected with 
exusfa as the type. Deplanata belongs to the southern fauna, the 
