THE GENUS CALOSOMA. 71 



that recoveries may be made within a few years. It is believed that 

 this species would be a valuable adjunct to the North American 

 fauna, and the fact that the larvae climb to some extent adds to their 

 efficiency as caterpillar destroyers. It is expected that this would 

 be a more valuable species for establishment in New England than 

 Calosoma auropunctatum, although less is known about the larval 

 habits of the latter. 



THE EGG. 



The eggs are yellowish white and elliptical in form, tapering toward one end. 

 Twelve fresh eggs gave the following average measurements: Length, 5.5 mm.; 

 width, 2.5 mm. The size varies, but they run somewhat larger than those of Calosoma 

 sycophanta, although the adults average considerably smaller. 



Hatching data were secured on 89 eggs deposited between dune 3 

 and 22, 1909, and the time in the egg stage ranged from 4 to 14 days, 

 or an average of 10. Similar data were again secured in 1910 for 82 

 eggs deposited between May 26 and June 30, and the number of days 

 passed ranged from 5 to 20, or an average of 13. In 1911, 54 eggs 

 were deposited between. May 22 and June 20, the period in the egg 

 stage ranging from 5 to 12 days, or an average of 8. Most of the eggs 

 included in the record of 1910 were deposited during the latter part 

 of May, when the temperature was much lower than for those 

 deposited in June, 1909. The records secured in 1911 are rather 

 similar to those of other species studied. 



BRIEF DESCRIPTION OF LARVA. 



First stage (PI. XIV, A, B). — Of medium size, fusiform. Average length of 12 

 specimens, 11 mm.; width, 3 mm. Caudal appendages long, straight, tapering 

 gradually from base to apex, bearing numerous long spines. Color glossy black. 



Second stage (PI. XIV, C, D). — Average length of 10 specimens, 18 mm.; width, 3.6 

 mm. Caudal appendages rather erect, tip curved backward. Color, shining black 

 above. No reddish-brown patch on dorsum of last segment. 



Third stage (PI. XV, A, B). — Robust in form. Average length of 8 specimens, 

 25.7 mm.; width, 5.3 mm. Caudal appendages short, erect, but slightly curved 

 downward beyond dorsal protuberance, which is rather short and arises slightly more 

 than one-half the distance from base to tip. Color shining black dorsally. Ventral 

 plates dark brown. No reddish-brown patch at base of caudal appendages. 



TIME REQUIRED TO COMPLETE LARVAL STAGES. 



Observations were made on a series of the larvae fed in 1909 and 

 1910 to ascertain the time required for the completion of the different 

 larval stages. From those observed hi 1909, which hatched June 21 

 to 28, an average of 3 days was required for the first stage, 4 for the 

 second, and 14 for the third to the tune when feeding ceased. 

 Another small series reared in 1910, which hatched June 13 and 14, 

 required an average of 6 days for the first stage, A\ for the second. 

 and 9 for the third. 



Some of the larvae of the series of 1909 molted in 2 days after 

 hatching, which is unusual, as 4 days is common with most species 

 of Calosoma. 



From 3 to 7 days were passed by the larvae in making a cavity 

 and preparing for pupation. A fair average covered by this period 

 is 4 or 5 days, making the total number passed in the larva] stages 

 25 to 26 days. 



