THALESTRIS. 135 
of the foregoing; penultimate joint much smaller. 
Anterior antennz of the male shorter and swollen, 
third joint very short and constricted, fourth much 
the longest and as wide as the two bagal joints, armed 
with a long falciform appendage, fifth and sixth joints 
about half the length and breadth of the fourth, 
seventh and eighth very small, last joint.as long as the 
fifth, but very narrow; a few crowded sete on the 
margin of the second joint, and three small ones at 
the apex of the last jot: inner branch of posterior 
antenne 2-jointed. Mouth-organs as usual in the 
genus. Lower foot-jaw (Pl. LXIII, fig. 15) terminat- 
ing in a slender clawed hand, in shape approaching that 
of 7. longimana, the hand being irregularly angular 
and subcrescentic, with the internal angle slightly 
setose; the claw strong and well curved. First pair 
of swimming-feet (Pl. LXII, fig. 14) almost asin 7. 
longymana, except that the terminal claws and setz 
are longer and more slender, the two branches being 
nearly equal, and the long claw equal in length to the 
branch itself. The inner branch of the second pair of 
feet in the male is, as usual, 2-jointed (Pl. LXIT, fig. 15), 
the three terminal spines being uncommonly small 
and slender (a). Fifth pair of feet in the female 
(fi. 16) having both branches of nearly equal length, 
the inner branch broad, sub-quadrate, and bearing five 
setee on the distal extremity, the margins between the 
sete ciliated; outer joint smaller, ovate, with six 
‘terminal sete, four of which aré small and slender, 
the apical two being larger. The fifth foot in the male 
(fic. 17) is smaller; inner segment short and broad, 
