224 MISC. PUBLICATION 4 2 4, U. S. DEPT. OF AGRICULTURE 



Ventral surface: Anteima bluntly conical, with 2 setae about same length 

 as, and 2 longer than, diameter of antenna ; 4 or 5 quinquelocular pores some- 

 times present between antenna and margin ; beak with 2 pairs of setae ; spiracu- 

 lar bar broad and expanded at inner end ; 20-30 quinquelocular pores extending 

 from spiracle to body margin in an irregularly single, double, or triple row ; 

 multilocular pores, totaling 100-130 and with 8-14 (usually 9 or 10) loculi, in 

 6 complete and 1-3 interrupted rows, posterior and penultimate rows each with 

 15-20 pores, each of next 2 rows with 20-25, next with 15-20, anterior com- 

 plete row with 10-15, and each of the others with 2-6 ; 4-6 dark-rimmed 8-shaped 

 pores each side of mouth parts, a few scattered anterior to mouth parts, and 

 a few tending toward arrangement in 3 or 4 transverse rows near posterior 

 end of abdomen; submarginal 8-shaped pores usually in an irregularly single 

 or double row, terminating near posterior row of multilocular pores, 1 or 2 

 opposite each marginal 8-shaped pore of nearer row ; submarginal setae in 

 a complete row terminating with oi* beyond marginal 8-shaped pores; 2 pairs 

 of setae in posterior row of multilocular pores and 1 pair in each of the next 



2 rows. 



Apex of abdomen : Notch present ; lobes sometimes indicated ; setae, apical 

 54-64 (j. long, interapical 12.6 \x long, dorsal 3.4-7.2 \i long, intermediate ventral 

 5.4-7.2 fi long, outer ventral 9 /*• long; anal ring with 6 setae 45-52 ^ long and 

 with an inner row of 6 and an outer row of 16-20 pores, divided on dorsal and 

 ventral sides ; ventral surface of apex slightly sclerotized and rugose. 



Second stage. — Resembling adult female but smaller : margin with 8-shaped 

 pores in a single row except at 1 or 2 points, where it may be irregularly double 

 for 2-4 pores, quinquelocular pores terminating at a point 5-10 8-shaped pores 

 from end of row of those pores, the row interrupted at anterior end, the pores 

 less numerous than corresponding 8-shaped pores ; dorsal surface with 8-shaped 

 pores less numerous than in adult, arranged in a double lateral and a submedian 

 row somewhat as in the larva, slightly smaller than marginal pores ; ventral 

 surface with 4 or 5 quinquelocular pores in each spiracular row. submarginal 

 8-shaped pores in a single row ; apex of abdomen as in adult but all setae about 

 one-fifth shorter. 



Larva. — Nearly elongate elliptical, posterior end narrowed. 



Margin : With 28 8-shaped pores, posterior pores smallest, the others gradu- 

 ally increasing slightly in size cephalad. axes of the posterior 6 pairs transverse, 

 of the others longitudinal ; a minute seta near each pore of the posterior 3 pairs ; 



3 pairs of setae at anterior end. 



Dorsal surface: 8-shaped pores in a submedian row of 8-10 (usually 9 or 10). 

 and a lateral row of 7-10 (usually 9), on each half of body, the pores of each 

 row nearly uniform in size, but the posterior one slightly smaller than anterior 

 pore, all smaller than marginal pores of same segments ; disk pores between 

 lateral and marginal, and between lateral and submedian, 8-shaped pores ; a pair 

 of minute setae near anterior pair of submedian 8-shaped pores. 



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

 stout, 2 slender ; antennal bases one-third length of antenna apart ; beak setae, *2 

 pairs apical, 1 pair basal : spiracle with 1 trilocular and 1 quinquelocular 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 ; 8 pairs of submarginal 8-shaped pores of which 1 pair is 

 between the antennae ; 11 pairs of submarginal minute setae, on abdomen, thorax, 

 and head, 1 pair of submarginal larger setae at anterior end ; 2 pairs of setae 

 between antennae. 



Apex of abdomen : Notch present ; lobes sometimes indicated : setae, apical 

 90 fi long, interapical 10.8-12.6 /j. long, dorsal 4 ix long, intermediate ventral 3.6 

 /j. long, outer ventral 7.2 ,u long ; anal ring with 6 setae each 21.6 m long, with an 

 inner row of 6 and an outer one of 12 pores, divided on dorsal side and tending 

 toward division on ventral ; ventral surface of apex sclerotized in dentate rows. 



Test of male. — Elliptical, with a minute notch at posterior end; 1 mm. long, 

 0.5-0.6 wide; nearly flat dorsally but slightly raised at anterior end, with a 

 faint median and lateral carina and transverse striatums ; flat or convex ven- 

 trally : greenish yellow, transparent, smooth, shiny ; marginal and dorsal fila- 

 ments whitish, the latter apparently very short. 

 Adult male. — 1.75 mm. long. 



Head: Antenna 10-segmented, formula (longest to shortest), (X), (III, IV), 

 (V), (VI), (II, VII, VIII, IX), (I) ; antennal setae, I, 2: II, 7; III, 9; IV, V, 

 apparently 11: VT, 12; VII. 7: VIII, 9: IX, 10; X, 15 slender and 3 very long; 

 basal bars very faint, slightly diagonal ; 12 setae on ventral surface. 



