314 Journal of Agricultural Research voi. xxii, no. 6 



larvae, we do not believe that ground squirrels are of much importance 

 as a natural check. 



In some instances both larvae and adults of Calosoma teptdum Lee. 

 have been observed to be especially numerous about cutworm-infested 

 fields and are, we believe, one of the lesser important predators. 



DESCRIPTION OF STAGES 

 EGG 



Spheroidal, flattened dorso-ventrally, glistening milk-white when first 



laid (PI. C, i), later becoming dull gray: i mm. in diameter, 8 mm. in 



height. Around the micropyle is the 



■. . v.. .i. ..•,•■■•:••., .' usual rosette which lies in the cen- 



'/C ^:--^r'-^'''Vi'.'''f ■■(■''''■■.•' ter of a finely reticulated area about 



. •. .-• 0.3 mm. in diameter. The pattern of 



■•, '• the reticulation is shown in figure i. 



From the edge of the reticulated area 



]!...;.... about 30 slightly raised longitudinal 



■/••.'.?■• ribs radiate toward the base, extend- 



fi. •' " ■ . 



■.■."'^:;{.. ing approximately four-fifths the dis- 



'"'/""■■/•■■■■■■} •! V '■^..•"■•. tance from the apex to the base. 



"■•■■■'••■.••....• ■;'■"■ The ribs are sometimes irregularly 



branched or connected by cross 



^^u'Z?'"'''''"^"''", "'■'A'^^'?!?'"-" ""'^^f'"'' ridges. The shallow channels be- 

 about the micropyie. Highly magnified. " 



tween the ribs are transversely 

 striated and lightly pitted. The chorion on the basal fifth of the egg 

 is smooth and glistening without ridges or definite reticulation. 



I^ARVA ^ 

 FIRST INSTAR 



Head width, 0.4 to 0.43 mm.; average 0.41 mm. 



Total length of body, 2.4 to 3 mm.; average 2.8 mm. 



The head (PI. 28, A) is a very dark glistening brown, almost black; 

 clypeus and front same color as epicranium; adfrontals indistinct, but 

 apparently extending almost to deep indentations at summit; mandibles, 

 labrum, ring-shaped sclerite resting on mentum, and cardo dark brown; 

 submentum, margins of stipes next the mentum, the antennae, and labial 

 palpae brownish; ©cellar region blackish. 



The posterior portion of the thoracic shield dark brown; anterior 

 margin very light brown. The thoracic legs are brownish with dark 

 brown transverse lines immediately anterior and partially surrounding 

 coxae. 



■ In the description of the larva the naming of the various parts follows very largely the system of William 

 T. M. Forbes U). 



