60 
Psyche 
[June-Sept. 
in those states. Three of these specimens being females 
we are able to determine satisfactorily the structure of the 
internal skeleton. In all other localities at which acuta has 
been collected, very similar species (such as maculosa and 
nebulosa) have also occurred, and in view of the relative 
scarcity of specimens of acuta , it has not been possible pre- 
viously to identify the female of that species. As I pointed 
out in 1933, although I had seen 75 males from scattered 
localities, I was not certain of the female. But the three 
females sent by Professor Cartwright were taken with the 
males of acuta , and no other species resembling acuta was 
secured at that locality. An examination of the ninth ster- 
nite of the female and of the internal skeleton shows several 
points of difference from those structures in nebulosa. It is 
now clear that several of the females of the nebulosa group 
which I have previously seen were acuta, though it was not 
possible to correlate the sexes. This has now been done. 
The internal skeleton is close to that of nebulosa, but the 
axis projects further beyond the plate, which is also dis- 
tinctly shorter. Furthermore, there is a supplementary 
plate which adheres to the inner surface of the 9th sternite, 
and which bears two black spots; these spots can be seen 
faintly through the sternite itself, when the insect is exam- 
ined under a bright light. This supplementary plate is like 
that of latipennis, but in the latter it is situated further 
posteriorly. Latipennis and acuta are the only known 
species which possess this supplementary plate. 
The female collected at Rocky Bottom, Pickens Co., S. 
Carolina (June 21, 1932), is here designated as the allotype 
and is deposited in the Museum of Comparative Zoology. 
Family Bittacidse 
Bittacus strigosus Hagen 
Synop. Neur. N. Amer., 1861, p. 246. 
One male of this species, contained in Professor Cart- 
wright’s collection, is the first record from South Carolina 
(Clemson College, June 27, 1931). 
Bittacus stigmaterus Say 
West. Quart. Rep., 1823, 2:164. 
One male, collected at Clemson College, S. Carolina (July 
