THE SCALE INSECT GENUS ASTEROLECANIUM 99 



This is the only known species having numerous disk pores on the 

 ventral surface arranged in complete rows in the position usually oc- 

 cupied by multilocular pores. It is also unusual in lacking submarginal 

 8-shaped pores in the adult females. 



ASTEROLECANIUM GILVUM, new species 

 (Fig. 27, K-T; pi. 9, CC) 



Habit. — Living on the lower surface of leaves. 



Test of female. — Nearly circular, about 0.6 nun. in diameter; strongly convex 

 dorsally, flat ventralry : pale yellow, nearly colorless, transparent, thin, smooth; 

 marginal filaments whitish, shortest on posterior half ; elliptical larval exit in 

 margin. 



Adult female. — Nearly circular, 0.45-0.55 mm. in diameter, posterior end some- 

 times slightly produced. 



Margin : 8-shaped pores in a single row, interrupted 1-3 times for 1-4 pores 

 near posterior end. but continued beyond for 3-5 pores and terminating once 

 or twice a pore's length from bases of apical setae, the pores in that part of 

 the row having the interruptions, those just anterior to this section and some- 

 times 1 posterior to it 7 //. long and 4 wide, the others 8 \x long and 4.5 wide, 

 usually about a pore's width apart, but the 2 or 4 pores anterior to the interrupted 

 section sometimes nearly a pore's length apart; trilocular pores in a single row 

 interrupted for 1-5 8-shaped pores at anterior end, terminating 2-5 8-shaped pores 

 anterior to interruption, 1 near each or near every other 8-shaped pore at posterior 

 end of row, elsewhere 1 near each such pore and usually 1 opposite each interval 

 between 8-shaped pores. 



Dorsal surface: Minute 8-shaped pores numerous in submarginal and lateral 

 areas, rather sparse elsewhere : disk pores fairly numerous ; tubular ducts in 

 submarginal and lateral areas. 24 n long. 



Ventral surface : Antenna irregularly circular, flat, with 2 setae slightly 

 longer than diameter of antenna : beak with 2 pairs of setae : spiracle with bar 

 slender and expanded at inner end. atrium enlarged, bag-shaped, and containing 

 6-10 trilocular pores, 6-10 similar pores extending to body margin in an irregularly 

 double row: a group of 4-7 dark-rimmed 8-shaped pores each side of beak, and 

 a few smaller pores in an irregular longitudinal lateral row : submarginal 8-shaped 

 pores in a single row terminating near anterior end of interruption in row of 

 marginal 8-shaped pores, usually as numerous as marginal 8-shaped pores: ap- 

 parently 8 pairs of submarginal setae posterior to anterior spiracles, the 

 posterior pair near the penultimate pair of marginal 8-shaped pores ; 2 pairs of 

 setae posterior to genital opening, 1 pair anterior to opening, 1 pair anterior to 

 those setae, and 1 pair still farther anteriorly. 



Apex of abdomen: Lobes indicated: setae, apical 48 ix long, outer ventral 3.6 

 fj long; anal opening ventral, close to margin, small, circular, its margin mem- 

 branous or faintly sclerotized. 



Larva. — Nearly elliptical, posterior end narrowed. 



Margin : With 28 elongate, slender 8-shaped pores, axes of all nearly longi- 

 tudinal : a pair of minute setae close to each of the posterior 3 pairs of pores; 

 2 pairs of setae at anterior end. 



Dorsal surface: 8-shaped pores in a submedian and a lateral row of 10 each. 

 on each half of body : in the lateral row the next to the anterior pore much 

 smaller than marginal, tbe 3 posterior to it. the 1 anterior, and the posterior pore 

 larger than the other 4. which are practically the same size as marginal pores : 

 in the submedian row. the posterior and The anterior 3 port's larger than the 

 others, which are smaller than the marginal pores: disk pores between lateral 

 and marginal 8-shaped pores. 



Ventral surface: Antenna! setae. I. 1 : IV. 1 : V. : VI. 3 long. 2 stout, 2 fairly 

 stont : antennal bases one-half length of antenna apart: beak setae, 2 pairs apical, 

 1 pair basal: spiracle with 2 trilocular pores; leg setae, coxa 2. femur 1 on inner 

 margin near base, tarsus 1 each on inner and outer margins ; tibia nearly one-half 

 length of tarsus: pairs of submarginal 8-shaped ports; 10 pairs of minute sub- 

 marginal setae, on abdomen, thorax, and head: 2 pairs of setae between antennae 

 and mouth parts. 



Apex of abdomen: Notch minute: setae, apical 18 n long, interaplcal 1-2 u 

 long, dorsal (anterior to apical) 1-2 /x long, outer ventral 1-2 u long; anal 

 opening apical, minute, its margin membranous; anal tube minute, cylindrical, 

 sclerotized. 



