100 Bulletin Wisconsin Natural History Society. [Vol. 6, Nos. 1 — 2. 
feet black. Wings hj^aline, yellow at the base, costa and pterostigma 
yellow. Abdomen black, segment 2 circled basally by a broad yellow 
band, divided on the dorsum. Segment 3 — 7 with dorsal divided spots, 
entire on 7 and 8. 
Female. — Similar, larger, the wings sometimes yellow, more so at 
the base. 
Life Zone : Upper and Lower Anstral. The species has been found 
in but four States, Texas, California. Illinois and Wisconsin. 
Wisconsin : Milwaukee, Cement jNlills, July 2, 1902. 
Time and Habitat — June, July, along streams. 
S U BFAM ILY CORDULI N AE. 
The present sub-family forms the connecting Hnk between the 
two other sub-famiHes of the most interesting group of dragon- 
flies, the LibelluHdse. In common with the preceding sub-family 
this group has tubercled eyes, the males also with auricles on the 
sides of the second abdominal segment and excavated anal mar- 
gins of the hind wings. To the Libellulinae the group is related by 
the position of the triangle of the hind wings even with or before 
the level of the arculus. In habits they are related to the Macro- 
miince, preferring the vicinity of their aquatic homes to the sun- 
shine of fields and roadsides. The genera can be separated by the 
following table : 
1. Fore wing with the short sector and the upper sector of the tri- 
angle approximated apically 2 
Fore wing with the short sector and the upper sector of the tri- - 
ang'le parallel or divergent apically ; all wings with dark 
spots at the base, the nodus and the apex Neurocordulia 
2. Internal triangle present in the hind wing' 3 
Internal triangle absent in the hind wing 5 
3. Stigma normal, triangle of hind wings crossed 4 
Stigma diamond-shaxDed, triangle of hind wings free. . . Helocordulia 
4. Wing clear, (triangles of hind wings rarely free) . . . . Somatochlora 
Wings with dark markings at base, nodus and apex. . . Epicordulia 
5. Triangles of fore wings crossed 6 
Triangles of fore wings free Dorocordulia 
6. Wings with basal markings, hind wings with four antenodals 
Tetragoneuria 
Wings clear, more than four antenodals, male inferior abdomi- 
nal appendages bifurcate Cordulia 
NEUROCORDULIA Selys, Bull. Ac. Belg. 31 (2), p. 278, 1871. 
Several species of this genus have been found in the Transition 
and Austra life areas, but it is hardly likely that more than one, 
obsoleta, is to be found within the state. N. ohsolcta is known 
from Illinois and other places in the Austral regions. It is rec- 
ognized from its dull brown color and obscure markings, which 
consist mainly in a short transverse line on each side of the dorsal 
