228 MISC. PUBLICATION 42 4, U. S. DEPT. OF AGRICULTURE 



median line, and sometimes scattered from there to margin, whitish or pale yellow, 

 median filaments twice as long as marginal, the rest shorter than marginal ; larval 

 exit elongate elliptical, in margin. 



Adult female. — Broadly ovoid, 1.9-2.4 mm. long, 1.25-1.75 wide. 



Margin: 8-shaped pores in a distinctly or irregularly double row (rarely in a 

 triple row at some point in lateral area and usually irregularly single for around 

 posterior 15 pores), terminating once or twice a pore's length from bases of 

 apical setae, 12-16 p long and 8-9 wide, the pores of each row around a pore's 

 length apart and the 2 rows around a pore's width apart ; quinquelocular pores 

 usually absent but rarely 1-8 near points where spiracular pore bands meet 

 margin ; disk pores dorsad of, and about half as numerous as, 8-shaped pores of 

 dorsal row, terminating near anal opening, also occurring ventrad of, and termi- 

 nating with, the 8-shaped pores, approximately one-fourth as numerous as 

 8-shaped pores of nearer row. 



Dorsal surface : 8-shaped pores in 4-6 groups along median line and sometimes 

 scattered between those groups and margin, tending toward arrangement in 

 transverse rows, the pores in median groups 16-18 p long and 9 wide, the others 

 12-14 p. long and 8 wide ; minute 8-shaped pores absent in specimens having 

 8-shaped pores scattered over surface, numerous and scattered between median 

 8-shaped pores and margin in other specimens ; disk pores numerous ; tubular 

 ducts 40 n long. 



Ventral surface : Antenna irregularly circular, sometimes sunken in derm, 

 with 2 setae slightly longer and 1-6 shorter than diameter of antenna ; beak with 

 2 pairs of setae ; spiracle with bar subcircular, a sclerotized area extending 

 from bar around opening, 5-7 quinquelocular pores in sclerotized area and 38-58 

 similar pores extending to body margin in a double to quadruple row, a total 

 of 45-64 in group and row and along margin ; multilocular pores, with 7-13 (usually 

 10 or 11) loculi, in 3 complete rows of 9 L -16 each, the total ranging from 32-47; 

 4-8 dark-rimmed 8-shaped pores each side of mouth parts, a few scattered on 

 anterior end, and others arranged in 7 or 8 transverse rows posterior to mouth 

 parts ; minute submarginal 8-shaped pores in an irregularly double, triple, or quad- 

 ruple row terminating near a transverse line drawn through anterior row of 

 multilocular pores, interrupted near antennae, but continued between them. 

 2-4 opposite every other marginal 8-shaped pore of adjacent row ; 3 or 4 disk pores 

 present in each spiracular pore band and 1-4 in each row of multilocular pores ; 

 submarginal setae in a complete row terminating opposite a point 3 or 4 pores 

 from end of row of marginal 8-shaped pores ; 2, or rarely 3, setae each in 

 posterior and penultimate rows of multilocular pores. 



Apex of abdomen : Notch small ; setae, apical 92-100 p long, interapical 40 p 

 long, dorsal 20-24 p long, inner ventral 7.2-8 p long, intermediate ventral 8-9 p 

 long, outer ventral 12-16 p long; anal ring with 6 setae 72-76 p long and with 

 around 36 pores ; ventral surface of apex heavily sclerotized around inner ventral 

 setae, surrounding area sclerotized in dentate rows. 



Larva. — Somewhat ovoid or broadly elliptical. 



Margin : With 28 8-shaped pores, the posterior 6 pairs distinctly smaller than 

 next 7 pairs, which are slightly smaller than the anterior pair, axes of the 

 posterior 6 pairs transverse, of the others longitudinal ; a minute seta close to 

 each pore of the posterior 4 pairs ; 4 pairs of setae at anterior end. 



Dorsal surface : 8-shaped pores in a submedian row of 7-10 on each half of 

 body, posterior pores very slightly smaller than anterior, all slightly smaller than 

 marginal pores of same segments ; disk pores occurring rather close to marginal 

 8-shaped pores and a few fairly close to dorsal 8-shaped pores ; a small seta 

 anterior to each anterior 8-shaped pore. 



Ventral surface : Antennal setae, I, 2 ; IV, 1 ; V, 1 ; VI, 2 long, 2 stout, ap- 

 parently 3 fairly stout, 2 slender ; antennal bases one-fifth length of antenna apart ; 

 beak setae, 2 pairs apical, 1 pair basal ; spiracle with 1 trilocular pore ; leg setae, 

 coxa 4, femur 1 on inner margin near base and 1 each on inner and outer margins 

 near center, tarsus 2 on inner and 1 on outer margin ; tibia one-half as long as 

 tarsus ; 7 pairs of submarginal 8-shaped pores, none present between antennae ; 

 9 pairs of submarginal minute setae, on abdomen and thorax, 3 pairs of sub- 

 marginal larger setae at anterior end; 3 pairs of setae between antennae and 

 mouth parts. 



Apex of abdomen : Setae, apical 135 p long, interapical 36-41 p. long, dorsal 7.2 

 P long, inner ventral 7.2-9 p long, intermediate ventral 4-10.8 p long, outer ventral 

 10.8-14.4 p long ; anal ring with 6 setae 32-35 p long and with an inner row of 6 and 

 an outer row of 12 pores. 



