INVESTTCATrON OK LI 1 



I is'ioin'. 



69 



Table XVIII. — Loii(/( vlh/ of lit pairs of Calusunia sycophniilit vkitkI ihniiKj llic Nidiivm 



of J 908. 



No. 



IT.-iC. 



1743 

 1771 

 1775 

 2705 

 2728 

 2720 



'2775 



Fe- 

 male. 



Kggs laid 



1909 1910 1911 



179 



IX 















310 



,U5 



n 



53 

 25 

 142 



Ilihcrnalion, llHO 11. 



Maloentcred An;;. 2(5, 1910, died 

 Male aiKl female entered Jiilv 

 28, 1910. 



Male and female entered .Iiilv 



20, liilO. 

 do 



1 male and 2 females entered 

 July 28, 1910; male died. 



Femulodicd Auk. l'"'. 1910. 

 MaliMlicd in liilxTnation in 1909, 



replaced; beetles died Aug., 



1911. 

 Female died July 31, 1911; male 



died Aur. 12, 1911. 

 Female died July 6, 1911; male 



died .Tillv31, 1911. 

 Male died July 5, 1911; female 



died July 11," 1911. 

 Female died .Xng. 3, 1910; male 



died Sepl. 2, 1910. 

 Maledied June21, 1909, replaced; 



female died Aug. 14, 1<»10. 

 Two males added in 1909; one 



died July 8, 1910; one female 



died Aug., 1911.2 

 Female died July 10, 1910. 



' Ace of male in this cxx)eriment not reeorded. 

 ■-Second female deposited eggs August 12, 1911. 



Of the females listed in the table, 3 lived two summers, 5 died at the 

 end of the third summer, and one is still living and ovipositing (Aug. 

 12, 1911). None of them laid eggs more than two seasons and some 

 of them only one. 



Of 1 males 4 died at the end of the first year or during the hiber- 

 nation period following it, 2 died the second summer, and 4 the third 

 summer. 



These experiments indicate that, on the average, there is little dif- 

 ference in the length of life of the males and females. The latter com- 

 monly live two summers, and if the full number of eggs has not been 

 deposited at the end of that time they continue to live until this 

 result is accomplished, provided a sufhcient food sii])|)ly is available. 



RELATION OF CALOSOMA SYCOPHANTA TO NATIVE SPECIES OF THE SAME 



GENUS. 



The native species most closely resembling Calosoma sycophanta are 

 C. scrutator Fab. and C. ivillcoxi Lee. 



C. scrutator is more common in the central and southern part of the 

 United States, and occurs somewhat rarely in the latitude of Boston, 

 Mass., and farther north. It is a larger species than C. sijcophanta; 

 the green elytra are margined with a purplish band, and the thorax 

 has a shiny copper-colored margin on all sides. These color markings 

 distinguish it from C. sycophanta. 



C. willcoxi is also a southern species but is occasionally found in 

 Massachusetts and might be mistaken for a small specimen of C. 

 sycophanta. It difl'ers, however, in having color markings on the 

 tliora.x and clvtra similar to C. scrutator. 



