282 ENTOMOLOGICAL NEWS. [June, '14 



12 " ........................................ 5 " 



12 " ...................................... | " 5 



12 " ............................................ 4 " 



12 " ......................................... 2 " 



.......... 



10 " ......................................... 6 " 



13 " ......................................... 6 " 



12 " ......................................... 6 " 



12 ......................................... 6 " 



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 



1 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 .19 grams 



6 2.15 grams 1.78 grams .37 grams 



7 1.82 grams 1.40 grams .42 grams 



8 1.40 grams 1.14 grams .26 grams 



9 1.50 grams 1.18 grams .32 grams 



10 i.io grams 0.90 grams .20 grams 



11 . 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 ENTOMOLOGICAL 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. 



