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



most strongly so at anterior end, sloping to posterior end, with 3 faint longitudinal 

 carinae or with none ; flat ventrally ; greenish or clear yellow, transparent, fairly 

 thick, punctate ; marginal filaments pale yellowish or deep pinkish, fragmentary, 

 but apparently shorter near posterior end than elsewhere ; dorsal filaments of 

 same color as marginal, occurring along median line and sparse on either side 

 of median crest but more numerous in submarginal area, as long as to twice 

 as long as marginal filaments ; circular larval exit in ventral surface at the 

 margin. 



Adult female. — Shape similar to that of test, 1.10-1.25 mm. long, 1 wide. 



Margin : 8-shaped pores in a single row terminating nearly length of apical 

 seta from setal bases ; the posterior 3 pairs of pores 12 fx long and 8-9 wide, 

 those adjacent 9-10 fx long and 7 wide, most of the others 10-12 fx long and 6-7 

 wide, usually a pore's length apart, usually the axes of a few diagonal or some- 

 what out of alignment ; quinquelocular pores in a single row terminating at 

 the posterior or penultimate pair of 8-shaped pores, or with 1 pair posterior to 

 the posterior 8-shaped pores, about one-half as numerous as 8-shaped pores at 

 ends of body, and one and a half times as numerous elsewhere ; disk pores 

 ventrad of quinquelocular pores, terminating posterior to 8-shaped pores nearly 

 directly anterior to apical setae, posteriorly as numerous as 8-shaped pores and 

 usually nearly as numerous elsewhere. 



Dorsal surface : 8-shaped pores along median line, in lateral and submarginal 

 areas, and sometimes a few or many in submedian area, a few 10 /x long and 

 7 wide, majority 12-14 /x long and 8-9 wide, and many 16-18 fx long and 10-12 

 wide ; the largest pores placed at regular or irregular intervals along median 

 line with smaller pores surrounding them, these sometimes arranged in circles, 

 majority of submedian pores small, a fairly definite row of the larger pores 

 paralleling margin but well removed from it, a few smaller pores between the 

 larger ones, number and size of pores varying considerably but general arrange- 

 ment rather uniform ; minute 8-shaped pores sparse among large 8-shaped pores, 

 numerous elsewhere ; disk pores fairly numerous ; tubular ducts 30 /x long. 



Ventral surface : Antenna dome shaped, with 2 setae longer than diameter 

 of antenna ; 3 or 4 quinquelocular pores between antenna and margin ; beak 

 with 2 pairs of setae ; spiracle with bar broad, nearly subcircular ; a sclerotized 

 area extending around spiracular opening inclosing a group of 8-12 quinque- 

 locular pores, and 8-13 similar pores extending to body margin in an irregularly 

 single row; multilocular pores, totaling 101-117 and having 6-10 (usually 10) 

 loculi, apparently in 7 complete and 2 interrupted rows, with anterior row 

 anterior to posterior spiracles, posterior and penultimate rows each with 8-10, 

 next with 15 or 16, each of next 2 with 19-27, next with 12-15, next with 7-9, 

 and each of anterior 2 rows with 4-6; 3-6 dark-rimmed 8-shaped pores each 

 side of beak, a few scattered anterior to mouth parts, and a few arranged in 

 5 or 6 transverse rows on abdomen : submarginal 8-shaped pores in a single row 

 terminating near penultimate row of multilocular pores, plainly single except 

 near posterior end, where a few pores are so placed as to suggest a double row, 

 nearly or actually as numerous as marginal 8-shaped pores ; 1-4 disk pores 

 near ends of penultimate row (sometimes in submedian area also) and of each 

 of the 4 or 5 rows anterior to penultimate row of multilocular pores; sub- 

 marginal setae in a complete row terminating nearly directly anterior to the 

 penultimate or posterior pair of marginal 8-shaped pores ; 2 pairs of setae in 

 posterior row of multilocular pores, 1 pair in penultimate row, and 1 pair in 

 first row anterior to penultimate. 



Apex of abdomen : Notch present ; lobes strongly developed ; setae, apical 57 

 fi long, interapical 12.6 /x long, dorsal 9 /x long, inner ventral 5.4 fx long, inter- 

 mediate ventral 5.4 /x long : anal ring with 6 setae about 37 /x long, and with 

 an inner row of apparently 6 and an outer one of apparently 12 pores, tending 

 toward division on dorsal side: ventral surface of apex with a densely sclerotized, 

 irregularly elongate area extending anteriorly from margin of notch on each 

 half of body, the surrounding area slightly sclerotized and rugose. 



Larva. — Elongate ovoid, tapering near posterior end. 



Margin : With 28 8-shaped pores, the posterior, and the anterior 8 pairs, 

 slightly larger than the other 5 pairs, axes of the posterior 6 pairs transverse, 

 of the others longitudinal ; a pair of minute setae close to each of the posterior 3 

 pairs of pores ; 4 pairs of setae anteriorly. 



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

 of 9 or 10, on each half of body, the posterior pores slightly smaller than the 

 anterior, all slightly smaller than, or same size as, marginal pores of same 

 segments ; disk pores rather close to marginal, and a few between lateral and 



