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



nating at the posterior or penultimate pair of 8-shaped pores, usually about as 

 numerous as 8-shaped pores. 



Dorsal surface : 8-shaped pores scattered, usually without apparent arrange- 

 ment, but sometimes with a tendency toward arrangement in transverse rows, 

 often most numerous in median area, and with a narrow submedian area at 

 posterior end with few or no pores, pores varying considerably in number, some- 

 times crowded and sometimes only fairly numerous, 12-16 /j. long and 8-12 wide, 

 the majority near the upper limits of those measurements ; minute 8-shaped and 

 disk pores numerous ; tubular ducts 34 n long. 



Ventral surface : Antenna rounded, with 2 setae slightly longer than diameter 

 of antenna ; beak with 2 pairs of setae ; spiracle with bar fairly broad to very 

 broad, with wrinkles in derm extending from bar around opening and with 3-6 

 quinquelocular pores in wrinkles, 10-20 (usually 10-15) similar pores extending 

 from spiracle to body margin in an irregularly single row, a total of 13-23 in 

 group and row combined ; multilocular pores, with 9-11 loculi, in 6 or 7 complete 

 and 3 or 4 interrupted rows, but with 10 rows in all, the anterior interrupted row 

 anterior to the posterior spiracles, the posterior row with 11-23 pores, penulti- 

 mate row with 14-20, each of next 3 rows with 17-37, next with 11-18, next with 

 7-13, and each of anterior 3 rows with 2-10, the total 132-177 ; 2 or 3 dark-rimmed 

 8-shaped pores each side of beak, some scattered on anterior end, and others 

 arranged in 5 or 6 transverse rows posterior to mouth parts ; submarginal 8-shaped 

 pores in an irregularly double row terminating near posterior row of multilocular 

 pores, usually about as numerous as corresponding marginal 8-shaped pores; 

 3-6 disk pores in an irregular row caudad of each end of posterior row of multi- 

 locular pores, 1-3 near each end of the next 2, or rarely 3, rows of multilocular 

 pores ; submarginal setae in a complete row terminating near the posterior pair of 

 marginal 8-shaped pores; 4-7 setae in the posterior row of multilocular pores 

 and 2 in the penultimate row. 



Apex of abdomen : Notch present : lobes indicated ; setae, apical 75-80 /x long, 

 interapical 10.8-12.6 m long, dorsal 7.2-10 /* long, inner ventral 5.4 /a long, inter- 

 mediate ventral 5.4 fx long, outer ventral 7 m long ; anal ring with 6 setae 36-40 it 

 long and with an inner row of 6 and an outer row of 14 pores, divided on dorsal 

 and ventral sides ; ventral surface heavily sclerotized in a roughly rectangular 

 area extending from margin of inner lobes anteriorly to anal ring, sclerotized 

 area more heavily sclerotized in dentate rows, surrounding derm usually 

 wrinkled. 



Second stage.— Resembling adult female but smaller; margin with quinque- 

 locular and disk pores not more numerous than corresponding 8-shaped pores ; 

 dorsal surface with 8-shaped pores much less numerous than in adult, arranged 

 roughly in 8 longitudinal rows ; ventral surface with 3 or 4 quinquelocular pores 

 in each spiracular row, 2 pairs of setae in median abdominal area ; apex of 

 abdomen as in adult, but all setae around one-fifth shorter. 



Lctrva. — Elongate elliptical. 



Margin : With 28 8-shaped pores, the anterior pair slightly larger than the 

 rest, axes of the posterior 6 pairs transverse, of the others longitudinal; 3 pairs 

 of setae at anterior end. 



Dorsal surface: 8-shaped pores in a submedian row of 7-10 (usually 8) and 

 a lateral row of 9, on each half of body, lateral pores practically same size as 

 marginal pores, submedian pores slightly smaller than lateral; disk pores 

 between lateral and marginal, and between submedian and lateral, 8-shaped 

 pores. 



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

 stout, 1 slender; distance between antennal bases equal to about one-half length 

 of antenna: beak setae, 2 pairs apical, 1 pair basal; spiracle usually with 1 

 triloctilar and 1 quinquelocular pore, rarely with a quinquelocular and a small 

 multilocular pore ; leg setae, anterior and middle coxae each 4, posterior coxa 3, 

 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 ; 

 10 pairs of submarginal 8-shaped pores ; 8-10 submarginal disk pores, on abdomen 

 and thorax, often very close to submarginal 8-shaped pores ; 7 pairs of submar- 

 ginal minute setae, on abdomen and thorax, 2 pairs of submarginal larger setae 

 at anterior end ; 3 pairs of setae between antennae and mouth parts. 



Apex of abdomen: Notch present; lobes sometimes indicated; setae, apical 68 

 fi long, interap'cal 7.2 n long, dorsal 2.5 n long, inner ventral 3.6 fi long, 

 intermediate ventral 3.6 fi long, outer ventral 5.4 fi long ; anal ring with 6 setae 

 22 fi long, with an inner row of 6 and an outer row of 12 pores, divided on dorsal 

 and ventral sides; ventral surface of apex slightly sclerotized close to margin. 



