INDEX. 49 
Page. 
Thrips, bean, hibernation : 39-40 
emergence therefrom, at Compton, Cal 36 
entrance, at Compton, Cal 36-37 
in navel end of orange 15 
history 16 
injury, nature and extent 8 
larva, first-stage, description 10-11 
habits 23-26 
molting 25-26 
second-stage, description 11 
larval period, length at Compton, Cal 32-34 
in Imperial Valley 33 
leaping 22 
length of life in winter 22-23 
normal. 22 
life cycle, total length at Compton, Cal 36 
mating, method 17-18 
molting of larva 25-26 
nymph, full grown. (See Thrips, bean, pupa.) 
young. (See Thrips, bean, prepupa.) 
occurrence, notes 40 
origin 14-16 
oviposition, method and time 18-19 
number of eggs deposited 19-20 
period 19-20 
prepupa, description 12 
habits 26-27 
(prepupal period, length at Compton, Cal 34-35 
in Imperial Valley 38-39 
pupa, description 13 
habits 26-27 
pupal period, length at Compton, Cal 34-35 
in Imperial Valley ; . 38-39 
recent records 16-17 
reproduction, kinds 20 
seasonal history at Compton, Cal 31-37 
Tempe, Ariz 39 
in Imperial Valley 37-39 
sexes, proportion 20 
greenhouse. (See Heliothri.ps hsemorrhoidalis.) 
pear, destructiveness in California 7 
Tobacco extract, blackleaf , and whale-oil soap, against Heliothrips rubrocinctus 
and bean thrips 44 
Tomato, food plant of bean thrips 28 
Triphleps insidiosus, enemy of bean thrips 42 
Tropseolum major, food plant of bean thrips 31 
Tulip poplar, bean thrips found thereon 31 
Turnip, wild, food plant of bean thrips 31 
Verbascum virgatum, food plant of bean thrips 31 
Vetch, wild, food plant of bean thrips 31 
Whale-oil soap. (See Soap, whale-oil.) 
o 
