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



Margin : 8-shaped pores in a single row terminating about twice a pore's 

 length from bases of apical setae, posterior pores 9 /jl long and 7 wide, the others 

 11-12 /J. long and 8 wide, a pore's width apart at anterior end, less widely sepa- 

 rated posteriorly; quinqnelocular pores in a single row terminating at end of 

 the row of 8-shaped pores or extending 1 or 2 pores beyond this point, as 

 numerous as corresponding 8-shaped pores near posterior end, usually one and 

 a half times as numerous as that elsewhere, sometimes twice as numerous as 

 corresponding 8-shaped pores near spiracular pore bands. 



Dorsal surface: Minute 8-shaped pores numerous; disk pores fairly numerous; 

 tubular ducts 24 /* long. 



Ventral surface : Antenna conical, with 2 setae longer and 1 slightly shorter 

 than diameter of antenna ; beak with 2 pairs of setae ; spiracular bar fairly 

 slender, expanded at inner end ; 12-21 quinquelocular pores extending from 

 spiracle to body margin in an irregularly single or double row ; multilocular 

 pores, with 10 loculi, in 4 complete and 4 or 5 interrupted rows, posterior and 

 penultimate rows each with 8-11 pores, next with 7 or 8, anterior complete row 

 with 8 or 9, posterior interrupted row usually with 3, each of other interrupted 

 rows with 2, the total ranging from 39-46; 2 or 3 dark-rimmed 8-shaped pores 

 each side of beak ; submarginal 8-shaped pores in a single row terminating near 

 median line nearly directly anterior to bases of apical setae, nearly as numerous 

 as marginal 8-shaped pores ; submarginal setae in a complete row terminating 

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

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

 complete rows. 



Apex of abdomen : Lobes sometimes indicated ; setae, apical 64 fi long, inter- 

 apical 3.6 fx. long, outer ventral 5.2 n long; anal opening ventral, twice its own 

 diameter from body margin, circular, its margin sclerotized ; 2 setae 3-5 (i long 

 on anterior edge. 



Larva. — Elongate elliptical. 



Margin : With 28 8-shaped pores, axes of all longitudinal ; 2 pairs of setae 

 anteriorly. 



Dorsal surface: 8-shaped pores in a submedian row of 4-9 and a lateral 

 row of 9, on each half of body, the total number in the specimens studied 27-36, 

 around one-fifth smaller than marginal pores ; disk pores between submedian 

 and lateral, and a few between lateral and marginal, 8-shaped pores. 



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

 stout, 2 slender ; antennal bases about one-half length of antenna apart ; beak 

 setae, 2 pairs apical ; anterior spiracle with 1 trilocular and 1 quinquelocular 

 pore, posterior spiracle with 1 trilocular pore; leg setae, coxa 3, femur 1 on nmer 

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

 long as tarsus; 9 pairs of submarginal 8-shaped pores; 7 pairs of minute sub- 

 marginal setae on the abdomen, 1 pair of submarginal larger setae at anterior 

 end ; 2 pairs of setae between antennae and mouth parts. 



Apex of abdomen: Notch small; lobes sometimes indicated; setae, apical 72 n 

 long, interapical 5 2 fi long, outer ventral 3.6 m long ; anal opening ventral, close 

 to margin, nearly circular; anal tube short, rather bulbous, sclerotized; anal 

 ring not conspicuously differentiated from tube, with 2 setae, each 3.6 m long. 



Test of male. — Elongate elliptical, 1 mm. long, 0.5 wide; dorsally convex at 

 anterior end, sloping to posterior end; flat ventrally ; very pale yellow, trans- 

 parent, very thin, shiny, punctate; marginal filaments very light brownish yellow. 



Adult male. — Broken, apparently 0.75 mm long. 



Head : Antenna 10-segmented. comnarative length of segments indeterminable ; 

 antennal setae, I, 1 or 2 ; II, 7; III-X, more than 7 but exact number inde- 

 terminable ; basal bars indeterminable ; approximately 25 setae ventrally anterior 

 to eyespots and near bases of antennae ; 8 or 9 setae dorsally near bases of 

 antennae. 



Thorax : Bar between wing bases nearly rectangular, three and a half times 

 as long as wide ; tibia apparently about as long as tarsus. 



Abdomen: Five segments each with a pair of setae dorsally on margin, ap- 

 parently 3 each with a pair of setae in ventral lateral area ; lobes indicated, 

 each with 1 long and 2 short setae ; penis sheath with 1 pair of setae dorsally 

 near base, apparently with 2 pairs of setae ventrally near base, and with 3 or 4 

 setae on each side of ventral opening. 



Male nymph. — Distinguishing characters similar to those of adult male. 



