348 GEOLOGICAL SURVEY OF THE TERRITORIES. 
found in October and early in November (the 6th) were pure white, and 
the appendages to the tail seemed to me to be more divaricate than those 
of summer, in which those appendages were of a red color.’ While the 
males are easily distinguishable from those of S. texanus by the much 
greater length and different style of branching of the second antennae, 
as well as in the smaller frontal tubercle and the slenderer caudal ap- 
pendages, the females differ but slightly, but may still be distinguished 
by the smaller eyes and longer second antenne. ‘This species is dedi- 
cated to Dr. L. Watson, who has been indefatigable in securing me 
specimens for examination of this and other Phyllopods. The male dif- 
fers from S. similis Baird from St. Domingo in the second antennee or 
claspers being much longer and slenderer at tip of the longer branch, 
while the shorter branch is much narrower. In the female the ovisae 
reaches to the penultimate segment of the abdomen, while, according 
to Baird’s figure, in S. similis it scarcely reaches to the end of the fourth 
segment from the end, and the second antenne are represented as being 
much larger than in our species. The figures do not exactly correspond 
with Baird’s description, for it is nearly impossible to make a charac- 
teristic drawing of the members of this family, and particularly of this 
genus.” 
STREPTOCEPHALUS SEALII Ryder. 
Streptocephalus sealii Ryder, Proc. Acad. Nat. Se. Phil., p. 200, 1879. 
‘‘In form and size this species resembles S. torvicornis Waga, but the 
third joint of the second antenne differs from that species in the details 
of its structure, and the ovigerous sacs of the female are 
- not blue, as in Waga’sanimal. The inner branch of the 
terminal joint of the male claspers is the shortest in- 
stead of the longest, as in 8. torvicornis; at the interno- 
anterior margin of the short branch there are two un- 
equal lobes extending forwards and lying flat against 
the laminar posterior border of the anterior branch; at 
the lower posterior angle of this. lamina, or blade of the 
forward branch, there is a well-marked, somewhat fal- 
cate process, which fits between the lower lobular pro- 
cess of the posterior branch and its scythe-shaped lower 
extremity. The anterior branch crosses the posterior 
at nearly right angles, and for about a third of its 
length maintains a pretty uniform thickness, and is 
straight, when it suddenly swells and bends forwards, 
phalus sult, oleeat, and as suddenly contracts and tapers for its remaining 
after Ryder. ~ two-thirds, ending in a slender, slightly-curved, pointed 
extremity. The first joint is long and robust, and from its apex ex- 
ternally the cylindrical, curved, antenniform organ arises, which is 
about as long as the filiform first antenne. The second jomt is very — 
tortuous, and is strongly bent and twisted upon itself. The third joint, 
which bears the complex terminal appendages, is wide; the appendages 
close against each other like the blades of scissors, whilst the processes 
of their opposing margins interlock as has been already described, and 
as can be fully understood by reference to the accompanying cut of the 
head of the male. The front of the head is prolonged into a straight 
beak, which hangs down nearly vertically between the first joints of the 
claspers, and is flattened antero-posteriorly, and emarginate at its tip. 
The antenniform appendage is much longer than in S. tevanus Packard, 
whilst the terminal branches of the claspers are widely different from 
those of that species in their shape and relative proportions. The male 
