DR. J. B. HICKS ON THE ORGANS 
M. Antenna of larva of Colymbetes striatus. 
Terminal joints. 
a, Spine or hair. 
b. Apex with three hairs. 
2. Enlarged view of 6 (fig. 1), showing the nerve. 
. Enlarged view of a (fig. 1). 
N. Antenna of Myrmica rubra. 
. The terminal and next segment, showing— 
aaaa. Organs as in other insects ; 
b b b. Smaller, communicating with the tubes, as in fig. 2. 
. Shows the elongated tubes with expanded extremities, proceeding from 55 b (fig. 1). 
. Section of antenna-wall. 
aa. The larger and more usual form. Diameter 375, Of an inch; length from 957 to 4; o 
an inch. 
bb. Diameter 4... of an inch. 
. Another form of a a (fig. 3). 
O. Antenna of Pronceus inetabilis. 
. Portion of antenna. 
. Section of antenna-wall, showing structure of a a a (fig. 1). Diameter -4y of an inch. 
. Section of antenna-wall. — 
c c. Shows section of fig. 1 c c. 
b b. Shows section of fig. 1 55. 
d d. Shows section of fig. 1 d d. Diameter qyp Of an inch. 
| Diameter yay of an inch. 
P. Antenna of Sirex gigas. 
. One segment, showing two kinds of organs :— 
a. With elevated closing-in membrane (see P. fig. 4). Diameter 44... of an inch. 
5. Cup-shaped membrane (see fig. 2 and fig. 37). Diameter ,1, of an inch. 
. Section showing the cup-shaped organs. 
. Superficial view. 
. Section of antenna-wall through fig. 1 a d, fig. 3 a. 
Q. Antenna of Arctia Caja, 
: One segment of male antenna, The organs are chiefly on the extremity of the lateral peeten, 
scales being on the opposite aspect. 
- Segments of female antenna. Organs on serrated aspect. 
. Magnified apex of serra, with organs. The dotted lines represent the interior condition. 
+ Apex of club-headed pecten of Odonestis potatoria. 
aa. Organs. 55. Hairs, 
. Enlarged view of an organ (a) and hair (5), with the cuticular lines, 
R. Antenna of Tryphena Bomba. 
. External aspect of a segment. (All are alike.) 
a. Scales on one side. 
b b. Organs on opposite side, with small hairs between. 
- Longitudinal section of ditto, showing nerve: a and 5. lobulated matter beneath organs. 
aged view of organs. aa. Organs, Between are hairs and cuticular markings. 
