80 PROC. ENT. SOC. WASH., VOL. 21, NO. 4, APR., 1919 



legs as usual in the genus, the measurements of one of an adult female as^ 

 follows: coxa, lOOyu, trochanter 64. 2/x, femur 110. GM, tibia 93^, tarsus, 43ju, 

 claw I7.8fj., the measurements in all cases being of the greatest length, the 

 corresponding parts on the different legs being approximately equal in length 

 with the exception of the coxae, which are progressively larger from fore 

 to hind, claw short and stout, in some specimens at least with a tiny denticle 

 at tip, so the apex appears bidentate; with two digitules, one about twice 

 the length of the claw, slender, knobbed at apex, the other a little longer, 

 distinctly stouter and with an elongate flattened, blade-like apex; tarsal 

 digitules about as long as claw digitules, both slender, knobbed at apex; 

 shank of spiracles slender, ends greatly enlarged transversely, the outer 

 more than the inner; marginal spines elongate, slender, acute, widely separated; 

 spiracular spines numerous, stout, bullet-shaped or cylindrical, with the 

 apex tapering conically and truncate, arranged in a close cluster of from about 

 26 to 48, varying considerably in size among themselves and in shape as well, 

 those along the body margin the largest; dorsal surface with scattered elongate, 

 slender, peg-like spines with rounded apices; ventral surface with similar 

 but smaller and more scattered spines or hairs; dorsally with scattered un- 

 usual triocular pores, the three openings arranged in line, the two outer 

 circular and much smaller than the inner ; ventrally with a band of, roughly, 

 around 200 multiocular disk pores running from each spiracle to the cor- 

 responding group of spines, with curved transverse bands of similar pores 

 surrounding and anterior to the anal plates, and with some very minute 

 scattered pores, apparently similar to the triocular pores described for the 

 dorsum, although too small to be definitely recognized; anal plates together 

 forming almost a circle, inserted at the apex of the small cone, an average 

 length 157 M, width of each 78 /*; each plate with the inner margin straight 

 and the outer continuously curved, but plainly widest before the middle so 

 the posterior outer face of the curve is longest and least sharp; showing a 

 continuous thickening around the margin due to heavy chitinization ; with 

 two marginal setae near the caudal apex, the inner and posterior about 28p 

 long, the outer and anterior about 43 n long, normally with two dorsal setae 

 set on the inner half about one-fourth or a little more of the plate length from 

 the posterior apex and a third set close to or on the inner margin of the plate 

 about half-way between the other two and the apex, but with some variation 

 in these positions; ventrally on each plate with a single seta set close to the 

 edge just anterior to and below the outer marginal seta, and with two or 

 usually three other setae in a row along the ventral ridge of the plate, the 

 posterior of these the largest, all these ventral setae smaller than those oc- 

 curring on the dorsum; with five fringe setae on each side, the outer two the 

 largest, the inner three smaller, the five forming into two groups; anal ring 

 small, stout, nearly circular, with a row of pores along the inner and outer 

 margins and with three hairs on each half, these set near the outer margin. 



This species has been described from 2o specimens mounted 

 on slides and from a number in position on the host plant, these 

 nearly all immature. They were collected on Lapium big- 



