240 THE AMERICAN NATURALIST. (VoL. XXXIII. 
side of the tank to the other and avoided the net. Could not 
be caught with a watch crystal. Movement, avoiding the net, 
etc., as in older larve.’’ On June 13 the rest hatched. 
Stage h. (Fig. 19.) Killed June 16, three days after hatching, 
12.5 mm. long. 
Development of Desmognathus.— Although I have fewer 
stages here to record, I can be more certain with the time- 
ratios between the stages, since all the observations were made 
upon a single batch of eggs, the ones described above, found 
Fic. 21. Fic. 23. Fic. 24. Fic. 25. 
Fics. "o — Developmental stages of Desmognathus fusca. In the above series the stages are 
nyes sd rage small letters for Sfelerfes and capitals for Desmognathus. Thes 
in hae tw ot correspond. Different views of the same — are designated by 
numbers pinia to an letter. AZ the figures are magnified five tim 
June 1, and probably laid the night or the day previous. My 
observations cover but four stages, as figured here, and the 
dates of the stages are as follows: 
Stage A (Figs. 20-22), June 11. 
Stage B (Fig. 23), June 14. 
Stage C (Fig. 24), June 18. 
Stage D (Fig. 25), June 21. 
The pigmentation which was distinctly noticeable in Stage C 
had by June 24 distributed itself in the characteristic pattern, 
leaving little unpigmented squares in the manner described for 
Spelerpes. I killed the last embryo June 30, at which date the 
