262 Noteft on the Biology of Pedicnliis liumaniis 
( 8 ) Medium ^ x medium $; 42 nymphs hatched, of which 31 became j 18 $$ 
adult. Mixed brood. (13(^(J 
(9) White (J X white $; 9 nymphs hatched, of which two became 
adult. Female brood. 
(11) Medium ^ x medium light 39 nymphs hatched, of which (28<5'c? 
30 became adult. Male brood (? mixed). ( 2 $?(?) 
(12) Medium ^ x medium $; 19 nymphs hatched, of which 11 (9$$ 
became adult. Mixed brood (?). l2cJ(J 
(13) Medium (J x medium light $; 46 nymphs hatched, of which 
38 became adult. Male brood. 38(J(J 
(15) Dark ^ x dark $; 9 nymphs hatched, of which 6 became 
adult. Female brood. 6 $$ 
(15 a) Dark ^ (from 15) x dark 50 nymphs hatched, of which 
24 became adult. Female brood. 24?$ 
(16) Medium x medium ?; 66 nymphs hatched, of which 64 
became adult. Female brood. 64 $? 
(17) Medium ^ x white ?; 42 nymphs hatched, of which 29 J 27 ?? 
became adult. Female brood (?). ( 2cJ(5'(?) 
(18) White (J X white ?; 25 nymphs hatched, of which 10 became j 8 <J(J 
adult. Mixed brood (?). (2?$ 
(19) White (J X white ?; 39 nymphs hatched, of which 26 became 
adult. Female brood. 26?? 
In this first generation, therefore, there are seven female broods, 
two male broods and one mixed brood. In addition there are five 
doubtful broods, three possibly female and two male, in which there 
are one or two examples of the other sex occurring. It is probable 
that in these cases individuals had managed to come in from another 
brood, for when feeding two or three broods at the same time, it was 
difficult to prevent them wandering. 
Second Generation. Broods from lice taken from the first genera¬ 
tion. The numbers refer to the above-described experiments of the 
first generation. 
(1) 18 d (? $(?) X 19 ? (??) • 33 nymphs hatched, of which 2 became 
adult. Male brood. 
(2) 8<J ($d) ^ 8?(?d'); 12nymphshatched, of which 5 became awlult. | 4?$ 
Mixed brood. ( 1 
(4) 13 d (c?<?) X 15a ? (??); 45 nymphs hatched, of which 28 became 115 ?? 
adult. Mixed brood. (13 
(6) 13 (J (cJcJ) X 3 ? (??); 20 nymphs hatched, of which 16 became j 13 dd 
adult. Mixed brood. ( 3$? 
