612 Journal of Agricultural Research vol. xx, No. 8 



It is bifore, elongate, larger than abdominal spiracles and placed with the fingerlike 

 air tubes pointing dorsad. Ten abdominal segments; ninth small, tenth reduced. 

 Each tergum of first three abdominal segments divided above into three distinct 

 areas, praescutum, scutum, and scutellum. Each tergum of fourth to eighth abdom- 

 inal segments divided above into only two areas, first containing praescutal and scutal 

 elements, second representing scutellum. Below these two areas and adjacent to the 

 epipleurum is the alar area. Abdominal spiracles placed anteriorly and in a small 

 separate corner piece, probably of alar area; spiracles bifore and found on abdominal 

 segments one to eight, that on the eighth being located slightly more dorsad than the 

 rest. Below a very indistinct and abrupt dorso-lateral suture and above a well- 

 defined ventro-lateral suture is a large, not subdivided epipleurum. The abdominal 

 epipleura are located considerably higher than the thoracic lobes. Below ventro- 

 lateral suture ishypopleurum subdivided into three lobes, one directly under the other. 

 Below hypopleurum is coxal lobe and below that sternum, consisting of eusternum 

 and a posterior triangular area representing parasternum or parasternum fused with 

 sternellum. Abdominal segments provided with setse as follows: One on praescutum, 

 a long and two short ones on scutellum, two on alar area located just above spiracle, 

 two on epipleurum, one on coxal lobe, and two on eusternum. One of the setae on 

 the scutellum is usually missing on abdominal segments five to nine. 



Measurements of larval stages 



WIDTH OF 

 STAGE. LARVAL HEAD. 



i o. 22 mm. 



2 32 mm. 



3 48 mm. 



4 64 mm. 



PUPA 



Pupa uniformly pearly white when first formed. Length 3.75 to 4 mm.; width 

 about 1.75 mm. Tips of wing pads attaining seventh abdominal segment, tips of 

 metathoracic tarsi extending beyond tips of inner wings. Head rounded, beak 

 elongate and slender. Head with two prominent spines toward vertex, a group of 

 two small spines and two spinules on each side above eyes, two pairs of small spines 

 near anterior margin and one on each side of front between eyes. Three pairs of 

 spines on beak between frontal ones and base of antenna, a pair of small ones on beak 

 midway between base of antenna and tip of beak, a pair on sides of beak between 

 latter pair and tip of beak, and two pairs of smaller ones on tip of beak. Prothorax 

 provided with one pair of antero-marginal setigerous tubercules, one pair of antero- 

 lateral, two pairs of medio-lateral, and four pairs of dorsal setigerous tubercules. 

 Mesonotum and metanotum each provided with three pairs of spines. Abdomen has 

 seven distinct dorsal tergites, the seventh being much larger than the rest, dorsal area 

 of each armed with a pair of large and a pair of smaller spines. Lateral area of each 

 tergite armed with a spine at base of which is a small seta. Epipleural lobes are 

 each armed with two minute spines. Ninth segment is as usual armed with two 

 prominent pleural spines. 



