42 TII % AMERICAN NATURALIST [Vol. XLII 



from 2-17 minutes, the mode being 4 minutes. All the 

 eggs were laid in water 66° F. 



An account of the first pair follows in tabular form : 



= ■= >. 













ji 



|l| 









I 1 



3* " 



r? 



2-7 



i 



3 " 







14 



I 





3 " 



4 " 

 10 " 



6 " 



2, 2, 3, 3, 7. 4 



3 







5 " 



2 



2, 8. 4 



1 



17, 20, 21 sees 



35, 17, 20, 25, 23, 18 

 22, 23, 25, 20, 18 

 20, 20, 22, 17, 17, 17 

 28, 27, 27, 22, 22, 20, 5 



The Eggs. — The second pair were in the embrace at 

 noon. At 1:30 P. M. they began laying and by 4:30 

 P. M. their complement numbering 600 eggs was laid. 

 The complements of females of Chorophilus triseriatus 

 vary from 500-800 eggs. The mature eggs of one ripe 

 female, 3.2 cm. long, numbered 418 for the right ovary, 

 354 for the left, or a total of 772. 



The eggs are laid in bunches and are attached to twigs, 

 branches, fine roots or grass stems. Each bunch contains 

 from 30-100 eggs. An actual count of 5 bunches gave 

 50, 80, 70, 68, 70, respectively. 



The measurements of eggs gave the following results: 

 the average vitellus diameter of 38 eggs was 1.1 mm., the 

 mode, 1.2 mm., the range, .9-1.2 mm. ; the average envelop 

 diameter was 5.8 mm., the mode, 5.6 mm., the range 

 usually 5.0-7.8 mm., though sometimes as low as 3.0 mm. 



The vegetative pole is white; the animal, brown or 

 black. The envelop about each individual egg makes up 

 the larger portion of the jelly mass of a bunch, yet, there 

 is in addition, some connecting jelly. This has a loose 

 gelatinous consistency and does not envelop the whole 



