ART. 12. MASKELL GENERA OF COCCmAE MORRISON. 9 



of two types, quite similar in appearance, the size varying only 

 slightly, with the notable exception that a little behind the antennae 

 ventrally is a pair of long slender setae, perhaps 6-8 times the length 

 of the adjacent derm setae ; anal tube, as represented in the preceding 

 stages, present only as a short, somewhat chitinized simple tube ta- 

 pering anteriorly ; no ventral cicatrices observed. 



Intermediate stage female. — Shape nearly globular ; antennae very 

 short and stout, conical, apex rounded, composed of nine segments; 

 legs much reduced, stout, tapering, the tarsal claw normally with 

 a minute denticle, the trochanter, though greatly reduced, present 

 and bearing a seta nearly as long as the remainder of the leg ; mentum 

 apparently two-segmented, not with three ; with two pairs of thoracic 

 and seven pairs of abdominal spiracles, each with the inner end 

 invaginated and with a collar of pores, two deep, around it, posterior 

 abdominal pair set very close to the anal opening, the openings of 

 the thoracic and abdominal spiracles approximately the same size, 

 but the former with a long chitinous bar attached; derm rather 

 thickly set with pores, all circular, including small clear pores sur- 

 rounded by a chitinized ring, multilocular disk pores, varying some- 

 what in size, shape, and internal composition, as shown in figures, 

 and relatively much larger simple clear disks surrounded by a chiti- 

 nous ring, the first two types numerous but scattered over both sur- 

 faces of the body, the third type placed in more or less evident trans- 

 verse rows ventrally and laterally ; derm with fairly numerous, small, 

 slender setae both dorsally and ventrally, these mostly larger and 

 stouter in the chitinized area surrounding the anal opening; anal 

 tube opening in a large, roughly circular, chitinized area at the pos- 

 terior apex of the body, long, heavily chitinized, the opening sur- 

 rounded by a slight chitinous ring and immediately within this a 

 band of heavily chitinized short-tubular pores, immediately below 

 this a band with numerous pores presenting a sievelike appearance, 

 below this a band of large, irregularly circular pores of indeterminate 

 structure, then a tube of plain chitin, and finally at the inner end 

 a band of heavy, irregular-shaped, multifaceted wax secreting plates ; 

 without traces of the ventral cicatrices of the larva, unless the numer- 

 ous, large, circular ventral disk pores, already described, are deriva- 

 tives of these larval structures. 



Larva. — Body somewhat elongate oval; antennae well developed, 

 compact, and stout, the apical segment much the largest, but not 

 conspicuously so, 6-segmented; legs normal, the claw with a large 

 denticle, and a pair of slightly knobbed digitules that surpass the 

 tip ; with 7 pairs of large abdominal spiracles and two pairs of differ- 

 ently shaped thoracic spiracles; body, both dorsally and ventrally, 

 with numerous circular, heavy disk gland pores, the central loculi 

 of which vary in number from 3-6 ; derm with rather numerous small 

 3136— 22— Proc.N.M.Vol.eO 29 



