178 



MR. D. SHARP ON THE RESPIRATOBY 



No. 3. The A. Upustiilatus was again watched at night, and its 

 movements recorded, thus : — 



7.42 P.M. observation commenced. 



7.48 at surface for 25 sees. 

 8. „ 23 „ 



8.12 „ 77 „ 



8.22 at surface for 70 sees. 

 8.87 „ 20 „ 



8.42 ceased observing. 



This observation was made after dark by light of a lamp ; the 

 beetle comported itself exactly as in the previous observation 

 made in daylight. 



No. 4. Oct. 17th. — The beetle in this instance was fasting ; 

 observation commenced at 2.1 p.m. It rose at 2.12 for 25 seconds 

 to breathe, and again at 2.49 for 75 seconds. It otherwise was 

 concealed in the mud. Observation ceased at 8.4 p.m. The beetle 

 was fed at 8.6 p.m. 



No. 5. Observation resumed at 4.25 ; beetle rose at 4.35 for 

 24 seconds to breathe ; again at 4.45 for 95 seconds ; and again at 

 5.6, remaining at the surface 150 seconds. The observation ceased 

 at 5.25. 



No. 6. Still later at night, 9.7 p.m., and by artificial light, in- 

 vestigation was renewed. The insect rose to draw in air at 



9.14, and up for 15 sees. 

 9.26 „ 80 „ 



9.36 „ 120 „ 



9.47, and up for 15 sees. 

 9.59 „ 15 „ 



10, 7 left off inspection. 



The six preceding observations may be thus reduced : — 



Obs. 

 No. 1 

 „ 2 

 „ 3 



„ 4 



„ 6 

 Totals 



Minutes obs. 



... 40 



... 100 



... 60 



... 63 



... 60 



... 00^ 



... '383 



Ascents. 



4 

 10 

 5 

 2 

 3 

 5 

 29 



Seconds at surface. 



106 

 274 

 215 

 100 

 269 

 245 



1209 



Summary. — The beetle rose, on an average, about once in 13 g 

 minutes for breathing, and remained, on an average, about 41| 

 seconds at surface for each respiration. The longest interval 

 observed between two respirations was 37 minutes ; but this was 

 an exceptionally long interval. The duration of a respiration 



