164 



MB. D. SHABP ON THE BESPIBATOKT 



3.44, remaining up 3 sees. 

 S.56 „ 4 „ 



4.10 „ 2 „ 



4.11, remaining up 10 sees. 

 4.16 „ 6 „ 



4.21 „ 12 „ 



TLlus each individual pa,ssed 9 seconds out of 50 minutes in 

 air-exposure. 



No. 3. September 5th, 1875. — Observations on four beetles, 

 two males and two females. Watching commenced at 3.22 p.m. 

 when the following ascents were noticed : — 



The beetles were entirely concealed under the mud, which they 

 suddenly left and directly returned to. 



No. 4. Same date and specimens as in preceding No. 3. — Began 

 to notice their movements at 7.42 p.m., by lamplight, daylight having 

 then gone : — 



7.48, remained up 2 sees. 



8.22, remained up 2 sees. 



That which came up at 7.50 swam round the vase. At 8.7, 

 a specimen left the mud and swam round the vase, but did not 

 rise to the surface. That which arose at 8.22 and remained 

 up 2 seconds made an excursion. These beetles generally kept 

 themselves concealed in the mud, but were not quite so inactive 

 as in the preceding set of observations. 



No. 5. Sept. 19. — Kept watch on a female from 3.36 p.m. 

 until 4.36 p.m. It remained buried in the mud all the while, 

 never being seen. 



No. 6. Sept. 20th. — Same female as in last, and in the same 

 vase. By lamplight, 8.42 p.m., proceeded to beep a close look- 

 out. The beetle rose at 9.1, and disappeared almost instanta- 



