120 
not distinct, but appeared as described.) Anal tubercles [Fig. 34, b] 
not prominent, with a mass of small glandular spots, and bearing one 
long hair, with some- 
times several smaller 
ones. Among the gland- 
ular spots are placed two 
conical projections or 
processes on each tuber- 
cle. These processes are 
from two to three times 
as long as broad at the 
base. Derm dotted with 
small round glandular 
, spots. Back, near the 
b / caudal margin, spotted 
with larger round gland- 
FlG. 34. — Caudal region of Psetidococciis trifolii: a, win- Fig. 35. — Foot of Pseudococcus 
ter female; b, summer female. Greatly enlarged. trifolii. Greatly enlarged. 
ular spots." Digitules and claws as described and figured by the 
writer. 
The larvae derived from the winter females are from 0.69 mm. to 
0.78 mm. long and half as broad as long at birth, and are elliptical 
and flat, looking much like scale insects. The antennae are six-seg- 
mented (Fig. 33, c). The minute structures of the caudal region are 
essentially like those of the adult females, as in Figure 34. 
The male, which G. C. Davis described, is a minute two-winged 
insect, with two long white tail-filaments, two pairs of eyes, delicate 
milky-white wings, and the body thinly covered with a white powder. 
The head, thorax, and first two antennal segments are of a deeper red 
than the abdomen, legs, and remaining antennal segments. The eyes 
are dark reddish brown. A mouth is not evident. 
The egg is elongate oval, 0.34 mm. long and 0.17 mm. broad, 
translucent orange-yellow at first, becoming brownish yellow later, 
and with a smooth surface. The egg-mass is surrounded by the cot- 
tony secretion of the mother. 
The winter females that I examined all had seven antennal seg- 
ments ; the grown larvae, six ; the full-grown summer females, eight ; 
