86 
Psyche 
[June 
Hairs of four types: (a) Minute, thin, somewhat flexuous 
hairs (length 0.01-0.03 mm.), which form a rather dense 
covering for the entire body, except the head, prothorax, “tym- 
panum,” and caudal boss; these are arranged in transverse 
rows encircling the body; they are spaced at distances roughly 
equal to their length, which is least at the anterior end and 
greatest at the posterior, (b) A few short, stout, rather stiff 
hairs, irregularly distributed and ranging in length from 0.02 
mm. on the prothorax to 0.08 mm. on the last abdominal seg- 
Fig. 1. — Larva of Leptanilla revelierei sardoa Emery: A, in profile, X60; B, head and 
prothorax in profile, X410; C, cephalic aspect of head, X400; D, “tympanum,” dorsal vien, 
X580; E , cephalic aspect of plowshare-like organ on prothorax, X425.; 
ment. (c) Long hairs with rather flexuous tips arranged sym- 
metrically in pairs on the dorsal surface, one pair each on the 
second to seventh (inclusive) abdominal segments; varying in 
length from 0. 13 mm. to 0.16 mm.; four of the longest forming 
a ring around the base of the caudal boss. Just outside this ring 
there are attached (d) two extremely long (0.3 mm.) hairs; 
these six hairs converge apically and give the appearance of a 
caudal appendage. 
