THE GENUS CALOSOMA. 101 



HIBERNATION. 



One pair of beetles entered hibernation August 30 and emerged 

 May 17 and 26, 1910, and the average date of entering for 10 adults 

 in 1910 was August 1 . Oaly one pair of these beetles lived, and they 

 emerged May 15, 1911. During normal seasons in Massachusetts 

 this species enters hibernation during the first half of August and 

 emerges between April 15 and May 15. 



The average depth in the gromid to which these beetles go to 

 hibernate is about 2 inches. 



THE EGG. 



The egg is white, ^[easurements of 12 fresh eggs in 1910 gave an average length 

 of 5.8 mm. and a width of 2.5 mm. The adults of C. caliduvi are much smaller than 

 scnttafor or si/cophanta, but the eggs run somewhat larger than those of either 

 species. They have the same general form (elliptical) as those of the species just 

 mentioned and taper sUghtly toward one end. 



The average nimiber of days required to hatch 59 eggs deposited 

 by one female between June 15 and June 28, 1909, was 4^. The 

 temperature at that tune was very favorable for the acceleration of 

 hatchijig, the maximum ranging between 80° and 90° F. One hun- 

 dred and ninety-nine fertile eggs deposited by several females be- 

 tween May 22 and August 2 required an average of nine days to 

 hatch. Most of the deposition took place during the month of June, 

 and nine days is about the normal time spent in the egg stage by 

 this species. 



DESCRIPTION OF LARVA.i 



First stage (PI. XVIII, A, B). — Length, 8 mm.; width, 2 mm. at third thoracic 

 segment. Form ellipsoidal, tapering more gradually toward the last segment than 

 in the con-esponding stage of C. frigidum. General color of the body and mouth 

 parts dull black, not shining. Head large, as long as wide, dorsal surface flattened; 

 palpi jjrominent, longer than antennse. Posterior margin of the head somewhat 

 emarginate at the center. First thoracic segment as long as the two following, slightly 

 wider than the head and e(.lges produced laterally. All the body segments except 

 the last are tnmcate behind, and bear a prominent impressed dorsal line. Caudal 

 appendages present, simple, and provided with numerous spines. 



A'enti'al portion of the iDody nearly pure white, but it is jirofusely covered with small 

 black chitinous plates. Spiracles nine, black, circular, and arranged just below the 

 lateral edges of the dorsal plates. Anal prolog moderately stout. After feeding for 

 a week the larva? molted. 



Second stage (PI. XN'III, C, D). — Soon after molting the larvae become black and 

 measure 18 mm. in length. Body somewhat stouter than in preceding stage. Head 

 longer than wide, emarginate behind. Prothorax wider than the head. Dorsal line 

 quite prominent. Abdominal segments truncate and slightly produced laterally. 

 The second molt occurred at, the end of a week. 



Third stage (PI. XIX, A, B). — The following description was not made until the 

 ]ar\-a was almo.«t ready to pupate. Length, 30 mm. Color, dull black. Head of 

 medium size, flattened, truncate behind, (lypeus sliglitly broader in front than in 

 ('. Jrigidiiiii. Strongly hiloljed. Suture; between clypciis and epicraniura subobso- 

 lete. Mandibles stoui, the large toolli near the base being deeply cleft on the inner 

 margin. Prothorax longer than the head, the hind angles slightly cm'ved. Meso- 

 and meta-lhorax smaller, but similar in shajjo, each thoracic segment bearing four 

 pairs of liairs on the dorsal plate. The abfloniinal plates one to seven of the same 

 form and l^earing a moderate carina lu^ar the jjoslcrior edge of the segment. Eighth 

 segmf-nt a little larger, sliglilly wider, and also^beai'iiig a carina, lateral edges of each 

 abdominal segment bearing tlireo short, hairs. The last segment small, posterior 

 angles iiroduced l)ackward, but hind cflge of segment, truncate; caudal appendages 

 lont.', bliMii. spiny, sliglilly depressed, and hearing on llu? upper surface a liunip-like 

 protuberance provided wilh a few H{Mnes. Tlie sj>iracles are nine in numbei', and are 



' BurKBiw, A. F. Notes on <'ertaiii Colooptcra known to altack ttie gypsy moth. In 44th Ann. Rpt. 

 MiiSs. State iJd. Agr. f. l,SOri, p. WZ AM (|i. m,-V^), pi. ;j-."i, 1H90. 



