ACTIVITY AND DISTRIBUTION 301 
taken when the species was breeding (see p. 212). The soil was kept very 
moist up to the time the first ovipositor holes were made, because this 
species lays only in moist soil. After this the wetting of the soil was 
done very cautiously, so as not to wash the eggs from the ground in 
steep parts. Accordingly, the holes were not obliterated from day to 
day. The counts, however, are not accurate for the soil in which a large 
number were made, because eggs are sometimes laid very close together 
and adjoining holes destroyed. Some eggs are deposited in irregular 
cracks and crevices where they are likely to be overlooked. The greatest 
care was taken to discover every hole made in the soils in which larvae 
do not occur in nature. Soils in the different lots were arranged in 
different orders. 
b) Results —Table LX VIII shows the approximate number of holes 
made in the clay and probably the actual number made in the other 
soils, together with the number of larvae which appeared: 80 per cent 
on the steep slope, 98 per cent in clay. 
The count of holes includes some in the first stages of digging, mere 
scratches on the ground, and others which had been excavated to the 
usual depth with or without eggs being laid. 
TABLE LXVIII (55) 
DISTRIBUTION OF OvrposIToR HOLES AND LARVAE OF C. purpurea limbalis UNDER 
EXPERIMENTAL CONDITIONS 
S=steep; L=level. 
Gua Cray, 9 Pts. FoREst Humwus, 1 Pr. CLEAN 
Humus, tr Pr. Humus SAND, 9 Pts. SAND 
S L S L S L S L S L 
nant (itoless cece ° fo) ° fo) ° ° ° ° ° ° 
(anvaesareni- 9 ° ° ° fo) | © ° fo) fo) 
MELOLES aera 21 5 fo) ° c ° ° ° ° ° 
Lot if \WWearvaer sey 12 I ° ° ° ° fo) ° fe) ° 
MELOlesee see D7 7 ° ° ° fo} fo) ° ° ° 
Lot MT) Tarvae seas 24 ste) ° fo) ° fo) fo) ° ° fo) 
c) Factors controlling habitat selection (55).—Pairs taken in coitus 
were placed in cages containing sand only and level clay only. No 
larvae appeared in either case. The experiment with the level clay 
has not been repeated. Females placed in cages containing rough, 
steep clay, deposited eggs. Eggs are also absent from dry soils, whether 
steep or level. . 
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