EXPLANATION oF Prats I. 
ANTENNAL SENSE-ORGAN OF CULICIDA. 
Figs. 1-6. Corethra 
1. First and second antennal segments of mature 
male; longitudinal section. 
N, main antennal nerve. 
, antennal muscles within first segment. 
O, anterior head-integument. 
C, chitinous covering of first segment. 
@, posterior portion of layer of ganglion cells. 
N’, nervecord which passes through layer of 
ganglion cells. 
W, transition stages between rods and hypo- 
dermal cells. 
8t, layer of rods. 
K, basal nuclei of the rods. 
fibrous layer. 
layer of ganglion cells. 
single layer of hypodermis. 
echitinous covering of the second segment. 
chitinous process of plate. 
the plate. 
, Inass of hypodermis behind plate. 
oO”, chitinous covering of first segment of shaft 
(third antennal segment). 
N”, nervecords of antennal shaft. 
M’, muscles of head. 
T, trachea. 
2. Part of plate with processes drawn in perspective. 
A, chitinous processes. 
P, plate with radial thickenings. 
c”, chitinous covering of first segment of shaft. 
A 
H, 
O, 
A, 
a 
First and second antennal 
main antennal nerve. 
muscles of first segment. 
chitinous covering of first segment. 
, nervecord which supplies second segment. 
Ca outer and inner layers of ganglion cells. 
? 
Cc’, 
Hepoeer ee 
¢e 
St, rods. 
Fig. 7. Culex. 
N, 
M, 
NW 
(ea 
itinous covering of second segment. 
culiciformis Degeer. 
3. Section through periphery of plate showing 
bases of processes. 
A, transverse section of a process. 
c’, chitinous covering of second antennal seg- 
ment. 
P, peripheral part of plate. 
Sector at about point A of fig. 1 of transverse 
section of second antennal! segment of male. 
A, chitinous process seen in transverse section. 
0’, chitinous covering of second segment. 
V, radiate spaces between groups of rods. 
St, rods, 
K, basal nuclei of rods. 
F, fibrous layer. 
G, layer of ganglion cells. 
, hypodermis of second segment. 
Rods. 
G, ganglion cells of rods. 
fiber. 
F er. 
K, basal nucleus. 
St, body of rod. 
. Transverse sections of rods; a, through base of 
a rod; b, through upper nucleus. 
St, body of rod. 
K, nucleus of rod. 
4 
segments of female; longitudinal section. 
L, K, V, thickened parts of chitinous covering of 
second segment. 
P, plate. : 
B, base of shaft. 
o”, chitinous covering of first segment of shaft. 
WN”, nervecords of shaft. 
T, trachea. 
29a 
