320 ENTOMOLOGICAL NEWS. | July, 16 
dominal segment 10 not so elevated, superior appendages not 
so high, and an additional black stripe on the second lateral 
thoracic suture.” Of the four related species of the gracile 
group considered in this paper, indefensum has the lowest 
tenth abdominal segment, and the superior apical apex is 
strikingly rounded as compared with the others. It will be in- 
teresting to know the female of indefenswm and to note what 
modifications of the middorsal thoracic carina between the 
mesepisternal fossae have taken place. May it not be expected 
that here the carina will be indented rather than elevated as 
it is in ascendens? In spite of its close resemblance to 
gracile, | believe that this species offers no such difficulties as 
kennedu, since the appendages are strikingly different from 
its closer allies. These differences, however, are concerned 
with parts of inferior appendages which have received little 
attention. In many genera of Agrionines the inner posterior 
surface of the inferiors are variously modified, the most com- 
mon form being a dorsally directed, acutely tipped, tubercle. 
These parts are concealed in lateral views, and are incon- 
spicuous and usually neglected in dorsal views. In kennedit 
and gracile the inner face of each inferior appendage is pro- 
duced in a great flattened, inward curved, obtuse tubercle; in 
indefensum this is reduced to a small inconspicuous promi- 
nence; the appearance in posterior view of the apex of the 
abdomen of indefensum, as compared with gracile and ken- 
nedu, has suggested the specific name (see figs. 7, 8 and 9, 
Plate XVII). 
On February 16, my father and I collected near the canal 
and government sawmill at Christianburg about a mile below 
Wismar. A short distance above the sawmill a dressing room 
for bathers is located. We collected in brush on the right 
bank of the canal below this dressing room, and along a small 
stream on the left side of the canal, parallel to and only a 
‘short distance from it, in the brush. My notes fail to show 
just where the two specimens of indefensum were collected. 
Acanthagrion adustum n. sp. (Plate XVII, figs. 1, 2, 10). 
Abdomen :@ 21-22.5, average 21.95, 9 21-22; hind wing @ 14-15, 
average 14.75, 2 106. 
