274 



INEZ WHIFFLE WILDER. 



B 

 C 



D 



E 



a 



<u 



a 



<A 



H 



03 



10 



\ 



8 9 10 ii 



12 



13 14 15 



* o 



o 



GRAPH II., showing a comparison of the proportionate lengths of the body 

 regions during the terrestrial larval period (cf. second column of statistics. Table I.). 

 Lines A, BC, DE, and F refer to the various terrestrial stages as in Graph I. and 

 line G shows, for comparison with F, the proportionate lengths of aquatic larvae 

 collected in September and October. 



EXTERNAL FEATURES OF THE TERRESTRIAL LARVA. 

 The most conspicuous feature of the newly hatched larva 

 (staged, cf. Plate I., I and 2) 1 is the bulging form of the abdomen, 

 due to the presence of a considerable mass of as yet unconsumed 

 yolk material. The skin over this region is thin, unpigmented, 

 and transparent, and the yellowish white appearance due to 

 the yolk cells beneath it contrasts strongly with the deeply pig- 

 mented surface of the rest of the body. Along the back on each 



1 Plates will be found at the end of the second part of this paper in the next 

 issue of the BIOLOGICAL BULLETIN. 



