3i8 Journal of Agricultural Research voi. xxn.No. 6 



teeth; lower margin of labrum reddish; ringed-shaped sclerite resting on 

 mentum blackened ; cardo and submentum brown with margins of stipes, 

 next the mentum, same color with the stripe broadening about the base 

 of the palpifer. 



The bands of dark brown bordering the adfrontals have the same 

 appearance as in the previous instar (PI. 29, A). 



The thoracic shield is dark brown with a distinct light-colored dorsal 

 stripe on either side of which toward the anterior margin of the shield 

 is a small blackened area with other dark spots toward the lateral margins 

 of the shield. 



The thoracic legs are tinged slightly with brown toward the apical 

 joints; claws reddish brown, and color markings remain the same about 

 the basal joints. Prolegs on segments 7, 8, 9, 10, and 13 are concolorous, 

 crotchets brownish; the anal plate is a gray green with dark spots in a 

 transverse row anterior to the setae; a light-colored dorsal stripe runs 

 through the plate. 



The dorsal stripe is gray-green, and the brown borders in the previous 

 instars appear greenish in this one; the subdorsal and lateral stripes are 

 greenish with a slight tinge of brown ; the general color is a greenish gray ; 

 setae single and ringed at base with light area; spiracles black, tubercles 

 green; the pulsating dorsal vessel can be easily seen through the epi- 

 dermis. 



Eighth instar 



Head width, 3.18 to 3.42 mm.; average 3.36 mm. 



Total length of body, 3.1 to 3.6 cm.; average 3.34 cm. 



The general color of the head is a light brown with a slight yellowish 

 tinge; ocellar region dark brown, ocelli i, 2, and 6 colorless, other three 

 dark brown to black; the front is a trifle lighter in color than the clypeus; 

 the adfrontals, which are made very distinct by a darker brown coloration 

 following the frontal sutures and by the dark bands following the epi- 

 cranial sutures, extend to the bottom of the deep indentation separating 

 the epicranial lobes at the summit; the mandibles are black at teeth and 

 at points of articulation, and between lies an area which is a very pale 

 brown in color; submentum and cardo brown; chitinized brownish stripe 

 on margin of stipes, next the mentum, broadened about base of palpifer; 

 antennae, labial and maxillary palpse brownish. 



The two bands of dark brown which border the adfrontals and which 

 are very conspicuous in the fifth, sixth, and seventh instars, are some- 

 what reduced, especially the upper parts of the bands in the regions of 

 the first and second setae, in the advanced stage of the last instar (PL 

 29, B) ; during the first days of the instar the bands extend from points 

 even with the base of the clypeus to the second epicranial setae, running 

 between the setae and the adfrontals; here they become slightly less 

 dense in color and divided, parts of the stripes continuing along the 



