180 ME. D. SUAEP ON THE EESPIEATOBT 



The beetle was not improbably disconcerted by the artificial 

 light. It occasionally progressed slowly by paddling with the 

 middle legs, the hind ones being extended, but almost motionless. 



Totals ... 120 • 43 527 



Summary. — The beetle rose, on an average, about once in 2| 

 minutes for breathing, and remained, on an average, about 12^ 

 seconds at surface for each respiration. The longest interval ob- 

 served between two respirations was 6 minutes ; the duration of 

 a respiration varied from a second, or less, to 50 seconds. The 

 time it was exposed for breathing bore to the time it was not so 

 exposed a ratio of 1 : 13|. Only two observations w^ere made, one 

 of them at night, and it was then rather more active than during 

 the day-observation. 



XV. ACILIUS FASCIATFS. 



No. 1. Oct. I7th. — The two specimens, 6 and 5, herein men- 

 tioned, were not fed for two days. My observations commenced 

 at 2.1 P.M. At 2.46 the male rose, and was at the surface 

 for 5 seconds; whilst the female emerged -at 2.49, remaining up 

 for 65 seconds. These beetles moved about but little, keep- 

 ing themselves much concealed. I left off further notice at 



3.1 P.M. 



No. 2. The specimens were fed at 3.6 p.m., and observation 

 commenced at 4.25. 



The male. The female. 



Eose at 4.43 for 70 sees. I Eose at 5.17 for 55 sees. 

 „ 5. 5 „ 100 „ I „ 5.20 „ 30 „ 



The beetles were nearly always concealed, and moved about but 

 little. Observation ceased at 5.25. 



No. 3. By lamplight, same evening. Observation commenced 

 at 9.7. 



