350 GEOLOGICAL SURVEY OF THE TERRITORIES. 
STREPTOCEPHALUS FLORIDANUS Packard. 
Streptocephalus floridanus Packard, American Naturalist, p. 53, Jan. 1880. 
The two basal filaments are as in S. tevanus; of the forceps at the end 
of the claspers, the filaments are much shorter and smaller than in 
S. texanus, so much so that there is no need of confounding the two 
species, and, besides, in the Floridian species the processes are ‘less broad 
and flat, and the inner of the two blades of the forceps have but one 
instead of two teeth. It approaches S. texanus in the robustness of the 
body, in the form and size of the caudal appendages, which equal, in 
length, the three last abdominal segments. It seems to approach 
S. similis Baird, which inhabits St. Domingo, but that species is not 
described with sufficient exactness to enable us to compare it properly, 
and indeed without good specimens for comparison it is difficult to say 
whether this species is different or not from S. sealii Ryder. 
Total length of male, 10"; length of 2d antennz when stretched 
out, 5-67"; length of caudal appendage, 2 2; total length of female, 
1 num, 
A pair, é and 2, found in the Saint John’s River, Florida, May 23, 
1879, by ’Alex. de Fries: received from Dr. Carl F. Gissler. It appears 
to differ from 8S. similis in the shorter filiform appendage of 3d joint of 
2d antennex, which is also very much shorter than in S. texanus. 
STREPTOCEPHALUS SIMILIS Baird. 
Streptocephalus similis Baird, Annals and Mag. Nat. Hist. 2d ser. xiv, 220, 1854. 
‘This species, which was found by M. Sallé in the island of St. Do- 
mingo in the West Indies, is of a slender and cylindrical form. The male 
is about five-eighths of an inch in length, and the female half an inch. 
The inferior antenne or cephalic horns in the male are large and tortu- 
ous; they are composed of three joints; the first or basal joint is the 
largest, is cylindrical, and extends for some distance straight forwards; 
the. second, smaller than the basal, is also cylindrical, curves slightly at 
first, then bends suddenly backwards upon itself; the third or terminal 
joint bends as suddenly forwards and terminates in a elub- shaped ex- 
tremity, which divides into two branches, one longer than the other, 
terminating in a long filiform process; the other “flatter, shorter, and 
dividing into two shorter filiform processes of unequal ‘length. The 
antenniform appendage is long and cylindrical, rather stout, and springs 
from close to the extremity of basal joint. The basal joint is destitute 
ot the lanceolate-toothed appendage on internal edge, which we see in 
the preceding species (S. cafer Lovén). The superior antenne are long 
and slender, and consist of two joints, the basal one much shorter than 
the 2d. The male organs are rather long, cylindrical, and of a horny 
texture. The front of the head is prolonged into a beak, which is flat, 
rather broad and slightly lobed at the extremity. Feet short. Abdo- 
men slender. Caudal appendages of moderate length, and beset on 
each side with numerous short and plumose sete. 
“Nhe cephalic horns in the female are short, thick, and terminate in a 
short spine at the extremity. The ovarian bag is conical, acute, and 
the ova are of an ochreous color. 
‘Phe chief differences between this species and S. cafer consist, in the 
male, in the shape of the front of the head, the organs of generation, 
and in the fnferior antenne having no lamina with “teeth on the basal 
joint; in the female, in the shape of the external ov: ary.” 
