90 PROCEEDINGS OF THE NATIONAL, MUSEUM. vol. 60. 



Adult female. — Scale as described by Maskell; body normally 

 nearly circular, with the pj^gidium slightly protruding, often appear- 

 ing oval, broader than long, due to the failure of the abdominal seg- 

 ments to expand during treatment; derm membranous, pj'^gidium 

 slightly chitinized ; antennae tiny tubercles pointed at tip, but with- 

 out setae ; spiracles small, stout, not accompanied by pores ; abdominal 

 segments rather indistinct, with little clusters of short tubular ducts 

 and tiny spines set in rings, beneath and at the margins of segments, 

 the ducts more numerous; pj^gidium without lobes or plates, the 

 margin somewhat undulating, with a small median ventral, mar- 

 ginal, chitinized thickening, this with a tiny seta on each side; dor- 

 sally with four small setae on each half of the pygidium, the first 

 two, one anterior to the other, not far beyond the chitinous thicken- 

 ing, the third and fourth widely separated, and much bej^ond the 

 first two, all submarginal; ventrall}?^ with the same number, but of 

 smaller setae, and with the pair at the outer end of the row, instead 

 of the inner ; with a few scattered, tiny, tubular ducts ventrally close 

 to the margin; paragenitals wanting; anal opening large, circular to 

 triangular, placed rather close to the posterior apex of the pygidium, 

 with distinct internal tube; apparently without dorsal setae or pores; 

 ventrally with a single seta on each side anterior to and diagonally 

 outside of the anal ring and three more in a group in the same direc- 

 tion near the anterior edge of the pygidium ; nearly all of the pos- 

 terior margin of the pygidium broadly but faintly thickened. 



Intemiediate stage female. — Cast skin large, very convex, covering 

 the adult, approximately circular, margin of pygidium of this stage 

 with lobes and spines as shown in figure ; body itself nearly circular, 

 antennae short tubercles bearing two rounded knobs and three spines ; 

 margin of abdominal segments with a very few setae and tubular 

 ducts; pygidium with two pairs of well-developed lobes, the median 

 largest, protruding strongly, deeply notched at apices, with the outer 

 tooth shorter than inner, second lobes similar in shape, but much 

 smaller and less prominent, and with a blunt tooth bej^ond these, 

 probably corresponding to third lobe; marginal setae, dorsal, one 

 small, on outer edge of median lobe, one, large, outside of second lobe, 

 one, large, bej'^ond marginal tooth, and one more, large, near end of 

 pygidium, ventral, possibly one on median lobes, one beneath and 

 beyond each of the other three dorsal setae, all small; with an in- 

 cision with more or less distinctly thickened edges between the 

 median and second lobes and traces of another outside of the second 

 lobes ; no marginal paraphyses ; anal opening median, circular, fairly 

 close to apex of pygidium ; dorsal marginal tubular pores ore or two 

 opening into first incision, two or three in the rudimentary second 

 incision, and one beyond each of the three large dorsal marginal 

 setae; with a micropore tube between the median lobes and another 



