746 Journal of Agricultural Research vol. xx, No. 10 



The mesothorax (PI. 91, A, D) is not constricted in circumference 

 anteriorly and is readily seen to be composed of the four primary tergal 

 annulets, a small fold ventrad of A and anterior to the preepipleurite, 

 the postspiracular area, preepipleurite and postepipleurite, prehypo- 

 pleurite and posthypopleurite, 4-jointed legs, and four transverse 

 sternal folds. A, B, C, preepipleurite, postepipleurite, prehypopleurite, 

 posthypopleurite, leg joints, and third and fourth sternal folds are 

 armed with spines. 



The metathorax (PI. 91, A, D) is similar to the mesothorax, except that 

 the small fold anterior to the preepipleurite and ventrad of A is larger and 

 bears hidden on its posterior surface an exceptionally small spiracle. 



Color. — The prothorax is whitish with the iollowing exceptions: A 

 supraspiracular black spot on B; black prehypopleurite and leg joints; 

 and a pair of black sternal neck plates. 



The mesothorax is whitish with the following exceptions: A subdorsal 

 black spot on A, B, and C; a spiracular and supraspiracular black spot 

 on B and C and the postspiracular area; a black preepipleural spot; and 

 black prehypopleurite and leg joints. 



The metathorax is similar to the mesothorax. 



ABDOMEN 



Structural characters. — In an intermediate (second to eighth, in- 

 clusive) abdominal segment (PI. 89, B; PI. 91, B, E) the tergum consists 

 of six transverse folds (A, B, C '• 2 ' 3 and D). The pleurum is divided 

 into preepipleurite, postepipleurite, hypopleurite, spiracular area ven- 

 trad of B and bearing the spiracle, and postspiracular area posterior 

 to the spiracular area and below C 1, 2l 3 . The sternum is composed of 

 two transverse folds before the hypopleurite and one behind it. The 

 uropods project from the hypopleurites. Annulets A, B, and C 2 , post- 

 spiracular area, preepipleurite, and postepipleurite are armed with spines. 



The first and ninth abdominal segments are similar (PI. 91 , C) but lack 

 a well-developed hypopleurite and uropod on venter and have four trans- 

 verse sternal folds. 



The tenth abdominal, or anal segment (PI. 91, C) consists tergally of a 

 large undivided area termed the epiproct, or anal plate; pleurally, of a 

 somewhat triangular fold situated in the anterior portion of the segment 

 similar to the preepipleurite (the anal opening occurring transversely 

 across the apex of the segment) ; and sternally, of the postpedes, the 

 area from which they spring, and the postcallus below the anus. All 

 folds and areas, except the postpedes, are armed with spines. The 

 area around the base of the postpedes is, however, but slightly spined 

 or haired. 



Color. — The intermediate (or second to eighth, inclusive) abdominal 

 segments are whitish, with the following exceptions: A subdorsal black 

 spot occurring and diminishing posteriorly on A, B, C 1 , and C 2 ; a supra- 



