1912] Anatomy of Tomato-worm Larva 249 
wrinkled on its dorsal aspect. It bears on its ventral side a 
pair of true legs. On the caudal part of the lateral surface of 
the prothorax can be seen an oval spiracle. 
Mesothorax and Metathorax (Fig. 1)—The mesothorax and 
metathorax are very similar, consequently the description of 
either will answer for both. Six, transverse furrows cut the 
dorsal surface of each segment and a pair of true legs is found on 
the ventral aspect of each. These two segments bear no 
spiracles. 
Legs (Figs. 1/g and 5).—The three pairs of legs on the thorax 
are approximately alike. On all these legs numerous small 
setz are borne. A leg consists of the following parts. At the 
base of each leg is a widened, oval, furrowed area, which con- 
stitutes the coxa (co) of the leg. The trochanter (tr), a wedge- 
shaped, darkened sclerite, exists on the ventro-mesal margin of 
the coxa adjacent to the following segment of the leg, the femur. 
The femur (fe) is the large, cylindrical segment distad of the 
trochanter. The tibia (tz) follows the femur and bends slightly 
mesad. The distal segment of the leg is a small, cone-shaped 
tarsus (fa), which bears on its distal end, minus an intervening 
‘suture, a single, dark-hooked claw (ca). 
ABDOMEN (Fig. 1).—The abdomen is by far the largest 
portion of the larva, for it consists of eight, possibly nine, large 
segments. Some writers consider the eighth segment, as it is 
here called, as made up of two segments. The proleg (a. pl) of 
the last segment in this case would be attached to the ninth, 
while the anal horn (ah) would be borne on the caudo-dorsal 
part of the eighth segment. In the abdominal segments one to 
seven, a distinct similarity exists. However the abdominal 
segments three, four, five and six, give rise to pairs of prolegs (pl). 
Fourth Abdominal Segment (Fig. 1) —Taking the fourth ab- 
dominal segment as a typical segment, one finds it is composed 
of eight, distinct, transverse, ridges on its dorsal and dorso- 
lateral aspects. Numerous pigmental areas can be found in the 
furrows. The most striking pigmental arrangement is the 
diagonal line of spots running from the dorso-caudal angle of 
the segment toward the ventro-cephalic portion. The large, 
oval spiracles (s) are located on the lateral aspects of the seg- 
ments in the ventral and cephalic portion. These oval, dark- 
ened areas (Fig. 6, s) on magnification appear to be made up of 
a fine network of dark chitin and also show an indefinite, 
