282 ENTOMOLOGICAL NEWS. [ June, ’14 
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Twelve nests were weighed, then the cores and rinds sep- 
arated and weighed by themselves. The table below gives 
these results. 
Nest Weight Weight of core Weight of rind 
I 1.85 grams 1.47 grams .38 grams 
2 1.76 . grams 1.44 grams .32 grams 
3 1.80 grams 1.54 grams .26 grams 
4 1.31 grams 1.06 grams .25 grams 
5 1.65 grams 1.46 grams IQ grams 
6 2.15 grams 1.78 grams 37. grams 
7 1.82 grams 1.40 grams .42 grams 
8 1.40 grams I.I4 grams .26 grams 
9 1.50 grams 1.18 grams .32 grams 
10 1.10 grams 0.90 grams .20 grams 
II 1.82 grams 1.55 grams .27 grams 
12 1.49 grams 1.20 grams .29 grams 
The average weight of a nest was 1.63 grams, of a core 
1.34 grams and of a rind .29 grams, showing that 5-6 of the 
total weight consists of the core containing the eggs, the re- 
maining sixth, of the porous, protecting rind. 
Coming to the number of eggs in a core, these are arranged 
in from 12 to 18 layers, each containing an average of 15 
eggs, making a total average of 225 eggs in each. In Vol. 
XXIV, No. 9, p. 431 of EntomotocicaL News, Mr. Laurent 
records the hatching of 150 nymphs from a small nest and 
300 from a large one. 
A fascinating account of the habits of these insects and the 
construction of the nests can be found in Social “Life in the 
Insect World,” by J. H. Fabre. 
