31 6 Journal of Agricultural Research voi. xxii, no. 6 



The dorsal stripe along the body is made of broken gray which is 

 bordered irregularly with brown. Subdorsal and lateral stripes brownish; 

 general color same as dorsal stripe, or lighter, with a greenish tinge. 

 Spiracles dark brown; setae single, tubercles greenish brown. 



FOtTRTH INSTAR 



Head width, 0.84 to 1.14 mm.; average 1.02 mm. 



Total length of body, 6.5 to 12.5 mm.; average 8.9 mm. 



Coloration of head slightly modified from preceding instar; front not 

 as dark, clypeus a lighter brown, and cranial lobes considerably darker 

 at top (PI. 28, D) ; mandibles are black at teeth and fade to reddish 

 brown to dark brown near articulations; labrum dark brown with 

 blackened notch; ring-shaped sclerite resting on mentum blackened 

 ventrally and with its setae within the sclerite; cardo dark brown; 

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

 palpae brownish; ocellar region blackish. 



Posterior part of thoracic shield dark brown; anteriorly it is lighter, 

 and in this lighter area are three distinct dark spots on either side of the 

 dorsal line and also larger dark spots toward the lateral ends of the 

 shield. 



Thoracic legs tinged with brown, claws and markings anterior to and 

 partially surrounding basal joints, reddish brown. 



Prolegs on segments 8, 9, 10, and 13 and rudimentary prolegs on 

 segment 7; crotchets reddish brown. 



The dorsal line is a greenish gray partially broken and bordered with 

 brown; subdorsal and lateral lines brownish; general color green to 

 gray; spiracles dark brown; tubercles are greenish, setae single and 

 ringed at base with a light color. 



FIFTH INSTAR 



Head width, 1.38 mm. to 1.98 mm.; average 1.83 mm. 



Total length of body, 11. 5 mm. to 18.0 mm.; average 16.1 mm. 



General color of head much lighter (PI. 28, E) ; ocellar region very 

 dark brown; ocelli i, 2, and 6 colorless, other three dark; mandibles 

 reddish brown to black at teeth; lower margin of labrum reddish, 

 blackened at notch; cardo and submentum bro^vn with the margins of 

 stipes next the mentum same color and with the stripe becoming wider 

 about the base of the palpifer; sclerite resting on mentum blackened. 



The two bands of dark brown on the epicranium and bordering the 

 adfrontals become prominent for the first time in this instar (PI. C, 2). 

 The rest of the head seems to have lost color, leaving these two stripes 

 which run from points even with the base of the clypeus to the second 

 epicranial setae, above which they gradually fade out about the first 

 epicranial setae. 



