38 
dominal appendages incurved beyond the end of the superior, 
which is one fourth to one third shorter, in the male narrowly 
cleft at tip, in the female pointed. Lateral appendages in the 
male one third, in the female one fifth, the length of the in- 
feriors. 
IV. Bastmscuna Selys. 
This genus contains but the one species following. 
Basiceschna janata Say. 
The nymph of this species resembles that of A’schna, but 
may be recognized by the greater number of lateral spines. 
the deep notch of the superior appendage, and the unusually 
narrow and pointed lateral lobes of the labium. We have 
taken the nymphs in Sand Lake, northeastern Illinois, on 
Chara in shallow water, and upon rotten logs along the shore of 
Delavan Lake, Wisconsin. Mr. Needham has studied the spe- 
cies at Ithaca, and made notes on it as follows: “This is a 
stream-loving species. It flies from the first of May until mid- 
summer. It is very common in the small turbulent creeks 
about Ithaca, where I bred a good many in 1897, and collected 
a large number of nymphs.” He has also a large number of 
specimens, in all stages except the youngest, from Mr. F. G. 
Schaupp, of Texas. 
The imago is on record from several Atlantic states, and is 
reported by Williamson in Indiana, and by Kellicott as not un- 
common May | at Columbus, Ohio. It has been taken once in 
Illinois, at Thatcher’s Park, Chicago. The dates given run from 
the last of April to September. Kellicott (797) collected it in 
April, under unusual weather conditions. 
The nymph measures 387 mm.; abdomen, 27 mm.; hind fe- 
mur, 6.5 mm.; width of head, 7 mm., of abdomen, 7 mm. 
Generally dark colored, the mid-dorsal pale line on the ab- 
domen often breaking down over the sides in pretty mottlings. 
The usual three yellow rings on the femora usually very dis- 
tinct. 
