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



Asterolecanium distinctum, new species 



(Fig. 20, A-P; pi. 4, B) 



Habit. — Living on the lower surface of leaves. 



Test of female. — Flat to oval dorsally, flat ventrally ; elongate elliptical, 2.5-3 

 mm. long, 1.25-1.5 wide ; bright, or pale brownish, yellow, transparent, punctate ; 

 with portion posterior to shriveled female having a honeycomb appearance 

 which is due to relatively clear areas in the mass of fine, curly, white or yellow- 

 ish filaments in which the eggs are deposited and from which the larvae have 

 escaped, the larvae leaving the test through a slit between the dorsal and 

 ventral surfaces on the posterior margin ; fine curly filaments and eggs also are 

 sometimes thrust out onto the leaf; marginal filaments whitish or very pale 

 pinkish ; dorsal filaments not observed, presumably present in submarginal area 

 of some specimens. 



Adult ■female. — Elongate elliptical, posterior end drawn out to a narrow 

 truncate tip; 2-2.5 mm. long, 1-1.25 wide. 



Margin : 8-shaped pores in a single row terminating about one-half length 

 of apical seta from setal bases, individual pores measuring 8 m long and 5 wide, 

 one to three times a pore's length apart ; trilocular pores in a single row ter- 

 minating near the posterior end of the row of 8-shaped pores, usually as numer- 

 ous as the latter near the posterior end and somewhat more numerous elsewhere. 



Dorsal surface : 8-shaped pores absent, or 1-16 such pores in submarginal area, 

 about 9 fi long and 6 wide ; minute 8-shaped pores numerous or sparse in lateral 

 area, not present along median line or close to margin ; disk pores fairly numer- 

 ous in lateral area and occasionally a few in median area ; tubular ducts 

 scattered in lateral area, rarely present along median line or close to margin, 

 about 7.2 fi long ; 2, or rarely 3, elongate, tapering, internal ducts, opening near 

 posterior end. 



Ventral surface : Antenna flat, with 1 or 2 setae as long as, and 2 longer than, 

 diameter of antenna ; beak with 2 pairs of setal bases ; spiracle with bar elon- 

 gate, expanded at inner end, atrium enlarged, bag-shaped, and containing 12-15 

 quinquelocular pores, 20-30 similar pores extending from spiracle to body margin 

 in an irregularly single or double row ; multilocular pores, with 8-12 loculi, in 7 

 rows, the posterior 5 rows usually complete and the anterior 2 rows usually inter- 

 rupted, each row segregated into groups, with a group of 1 row sometimes 

 appearing to merge with a group from an adjoining row, so that it is 

 difficult to determine the number of pores in each row, but the numbers in 

 the various rows approximately as follows : Posterior row with 38, penultimate 

 with 25, next with 57, next with 51, next with 45, next with 32, next with 10, 

 the total approximately 250; a group of 30-50 dark-rimmed 8-shaped pores each 

 side of mouth parts, usually a group of 5-10 posterior to each antenna, and 

 6 or 7 groups on each half of body posterior to, and in direct line with, outer 

 pores of the group beside beak. 15-20 in each of the anterior 2 of these groups, 

 6-10 in next, 1-5 in each of the others, the posterior 3 or 4 groups usually among 

 the multilocular pores ; submarginal 8-shaped pores in a single row but more 

 crowded on posterior third than elsewhere, terminating at or near median line 

 at posterior end, two or three times as numerous as marginal 8-shaped pores ; 

 submarginal setae in a complete row terminating near the posterior 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 : Setae, apical 66 fi long, interapical apparently 2 ft long, 

 outer ventral (outside apical on margin) 2 /x long; anal opening and anal tube 

 not apparent ; 2 heavily sclerotized contiguous collars, without setae, but with 

 inner ends divided into a varying number of clear areas suggestive of pores, 

 sunken in derm, their circular openings in margin ; a smaller opening, presum- 

 ably corresponding to opening in the center of a circular anal ring, contiguous 

 to collar openings and on ventral side of them, its margin heavily sclerotized ; 

 derm surrounding collars slightly sclerotized. 



Larva. — Elliptical. 



Margin : With 28 8-shaped pores, axes of the majority transverse or diagonal ; 

 3 pairs of setae at anterior end. 



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

 on each half of body, about two-thirds the size of a marginal pore; 3 or 4 disk 

 pores observed ; 1 pair of submedian setae near anterior end. 



Ventral surface : Antenna apparently 5-segmented ; antennal setae, I, 1 ; IV, 1 ; 

 V, 3 long, 2 stout, 3 fairly stout ; bases of antennae one-half length of antenna 



