82 PKOCEEDIlSrGS OF THE NATIONAL, MUSEUM. vol. GO. 



material, evidently from different collections, bearing No. 64, and 

 from the latter it has been possible to obtain additional mounts for 

 study, although it has not been possible to determine with certainty 

 which unmounted lot of material represents the type lot. 



Adult female. — Strongly convex, globular, or, when closely 

 crowded, even higher, usually pale yellow in color, anal cleft com- 

 pletely fused, the anal plates placed in a slightly chitinized plate 

 high up on the posterior face of the body ; derm clearing completely 

 in younger specimens, more or less chitinized in the older, more fully 

 matured forms; antennae small, 8-segmented; legs small, slender, 

 normal, all digitules slender and knobbed at apices, claw with denti- 

 cle; spiracles normal; mentum short, 1-segmented; marginal setae 

 small, entire, scattered, not in a distinct row ; spiracular spines very 

 stout, short, blunt tipped, normallj^ with two opposite each anterior 

 and one opposite each posterior spiracle; derm with occasional tiny 

 setae, especially beneath; dorsally with an occasional long tubular 

 duct with threadlike continuation, ventrally with small quinque- 

 locular disk pores betw^een spiracles and margin and numerous much 

 larger multilocular pores over the ventral surface of the abdomen; 

 anal plates half oval, outer angle rounded off, the ends pointed, with 

 about four dorsal setae, near posterior apex, and one apical seta, 

 ventral ridge with five large setae; no fringe setae as such noted; no 

 hypopygial setae; anal ring placed below and within the plates, 

 small, oval, apparently without pores, but with numerous (about 16) 

 closely set setae. 



Intermediate stages. — Not recognized. 



Larva. — Body elongate oval; antennae 6-segmented, slender; legs 

 slender, long, normal, all digitules slender, threadlike with knobbed 

 tips, one tarsal digitule smaller than the other and inserted above it, 

 claw with denticle at apex ; body margin with a series of rather long 

 setae, blunt-tipped and mostly bent or curved backwards ; spiracular 

 spines very short, stout, and bluntly rounded, normally with twoj 

 opposite each anterior spiracle and one opposite each posterior, rarely 

 with two opposite the latter ; Avithout dorsal setae or pores ; ventrally 

 with two submarginal rows of small setae on each side, paralleling thej 

 marginal, of which the setae of the outer row are about twice the 

 length of those of the inner row ; derm pores confined to the smal 

 quinqueloculars, in rows of from two to four, between the spiracles 

 and the margin; anal plates half oval, pointed posteriorly, with 

 long apical seta as much as two-thirds the body length, but usualb 

 broken off more or less; with two subapical and one dorsal tetaej 

 with one ventral ridge seta; apparently with one fringe seta; hy- 

 popygial setae wanting; anal ring small, placed just below the 

 anterior end of the plates, with six setae. 



Cotype.—C2it. No. 24773, U.S.N.M. 



