308 EGIDA. 
composed of only three joints. A very careful exami- 
nation of the species has, however, shown that in all these 
characters Van Beneden has fallen into some unaccount- 
able error. The eyes under a strong lens are not faceted. 
The seventh or last segment of the body is considerably 
shorter than the sixth; the first segment of the tail is 
still shorter and abbreviated at the sides, whereas the 
second, third, fourth, and fifth segments are of equal size, 
perfectly distinct in their articulations, and with the 
posterior-lateral angles of each produced into an acute 
point like the terminal segments of the body; the sixth 
or terminal segment of the tail is of large size, semi- 
ovate, and has a deep transverse impression near the base 
(this impression is not represented in our outline figure, 
but it seems to correspond with Van Beneden’s narrow 
penultimate segment). 
The upper antennz are very short and cylindrical, 
composed of three basal joints, arising from a fixed base, 
the third being as long as the two preceding joints taken 
together, followed by three small articuli, of which the 
last is very minute, and almost concealed by terminal 
sete. The lower antenne are about two-thirds of the 
length of the animal, having five basal joints, thicker 
than the remainder, extending to the extremity of the 
upper antennz, followed by a long very slender flagel- 
lum, composed of a great number of minute articuli. 
The mandibles are horny, with several conical teeth at 
the tip, and with a slender movable blade attached to 
the inner margin, having a finely serrated upper edge. 
They externally bear a slender three-jointed palpiform 
appendage. 
The foot-jaws are six-jointed, the joints of moderate 
width, the second having the inner apical angles pro- 
duced, the remainder being armed with bristles on the 
