125 



of the rose colored variety, and must have originated in Sene- 

 gal. But the most interesting point of all is the fact, first 

 pointed out hy Stal, that all the other species of that group of 

 the genus to which this species belongs are American, whence 

 it is highly probable that A. peref/rinuin also is indigenous to 

 America, from whence it has been recorded Its occurrence in 

 mid-ocean in such numbers is a clear indication that it oriii- 

 inally flew from one continent to the other in sufficient numbers 

 to establish itself in a new home. {JDec. 14, 1877.') 



§ 28. Chemical Experiments on the Respiration of 

 Insects. Mr. G. Dimmock called attention to an article, by 

 Robert Pott, in Landwirthshaftliche Versuchsstationen, xviii, 

 1875, p. 81, entitled Ueber die Mengen der durcli Respiration 

 und Perspiration ausgeschiedenen Kohlensaure bei verschie- 

 denen Thierspecies in gleichen Zeitraumen und unter ver- 

 schiedenen physiologischen Bedingungen, in wdiich are recorded 

 tlie results of experiments to determine the amount of carbonic 

 dioxide given off by forty-two diflPerent animals, under similar 

 conditions. The results of the ex])eriments on the insects were 

 as follows : For every one hundred grams weight of living in- 

 sects, there was exhaled durino; six hours, the annexed weight 

 of carbonic dioxide (CO2). 



MIstkafer, Geotrupes vernalis, ... 



Lanfkiifer, Carabus, ..... 



Engerling, [larva of" May-beetle^], 



Fuchsschinetterling [Frtnessa nrticae'], . 



Kohlweisslingraupe, Pieris brassicae [larva], 



Ligustersohwarmerraiipe \^Sphinx liffuxtri, larva], 



Ligusterschw'armerpuppe. \_Sphinx ligusitri, pupa], 



Weidenbohrerraupe, Cofisus ligniperda [larva], 



Biirraupe, \_Bombyx caryae] ..... 



Grashiipfer [grasshopper], 



" (andere Species) [grasshopper, another 



species], ...... 0.442 " 



" (andere Species) [grasshopper, another 



species], 0.593 " 



Gryllus campestris (6 Tage alt) [6 days old], . 1.356 " 

 '• " (and. Individuen)- [other individuals], 1.382 " 



Blattwanze [Tenthredo?], ..... 1.276 " 



1 The parts in brackets were added by Mr. D. The rest of the table is quoted. It 

 is to be regretted that writers on chemical zoology do not always give the scientific 

 names of the species experimented on. 



