- Tue Hoa Louss 651 
Time of development from first-stage larva to mature 
LGU PRMEUR EE St i LL wha pe wath Pail 16 to 18 days 
semperature and other conditions..........+....... 35° C., continually 
next to body, in 
vials 
Number ok teedings in 24 hours... .....00......4% 1 to4 
Dinatiomomeycle trom egg, tOege..< 2. 8 6 ncn we ees 29 to 33 days 
THE EARLY STAGES 
The newly hatched louse has 5-segmented antennae and a 9-segmented 
abdomen, as are found in the adult. The claws and the pad, already 
described, are present as in the adult, but no joint between the tibia and the 
tarsus appears until after the final molt (Plate LVIII, 1 and 5). Attention 
was drawn to this point by Gillette in his brief description of the species 
written for Coburn (1912:497). The head is large in proportion to the 
almost colorless body. Only the claws, and the sides of the head in the 
region of the clypeus, show marked chitinization. During the first instar 
(Plate LVIII, 3) the dark color gradually extends along the lateral and pos- 
terior dorsal regions of the head and the thorax, the legs become more 
strongly chitinized, and there is some indication of the transverse abdominal 
plates. The chitinous plates of the pleurites are represented by small, light 
brown spots close to the spiracles. In the second instar (Plate LYIII, 4) 
the chitinization is generally more marked, but the buccal tube can still 
be ciearly seen through the integument. The transverse abdominal plates 
are more developed, the plates of the pleurites are approximately four times 
as large as in the first instar, and between these two are small circular 
chitinous areas. In the third instar (Plate LVIII, 5) the head is more 
strongly chitinized and the buccal tube can no longer be seen throughout 
its length. The plates of the pleurites resemble those of the adult but 
are somewhat lighter in colour. The ninth abdominal segment shows 
no chitinization but is turned slightly dorsad, and the first antennal 
segment, which in the previous stages was almost of the same diameter 
as the four other segments, is now considerably larger than these. At 
the third molt the chitinous plates, which are the external indications of 
sex, appear at the posterior end of the body. In both male and female, 
maturity is indicated by a sternal chitinous plate which appears on the 
thorax about the third day after the final molt (Plate LVIII, 6). The 
