THE SCALE INSECT GENUS ASTEROLECAXIUM 177 



Allied to belktm and robarls. Like the latter it shows an unusual 

 amount of variation in the number and position of setae associated 

 with the apical setae and the anal opening. 



Asterolecanium roboris, new species 



(Fig. 60, A-D; pi. 8, F) 



Habit. — Living on bark. 



Test of female. — Ovoid, posterior end slightly produced: 1.5-2 mm. long, 

 1.5-1.75 wide : strongly convex dorsally, sometimes with faint transverse stria- 

 tions; tlat ventrally; greenish yellow, transparent, fairly thin: marginal fila- 

 ments whitish, slightly shorter at posterior end than elsewhere: dorsal fila- 

 ments whitish, scattered, practically same length as marginal: elliptical larval 

 exit in dorsal surface at margin. 



Adult female. — Ovoid, posterior end slightly produced: 1.5-1.7 mm. long, 1.2 

 wide. 



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

 from bases of apical setae, posterior pores 12 fi long and 8 wide, the others 

 13-14 /JL long and 9 wide, slightly more than a pore's length apart: quinquelocular 

 pores in an irregularly single and double row between spiracular pore bands 

 and extending to about the eighth 8-shaped pore anteriorly from the anterior 

 band and an approximately equal distance beyond the posterior band, 1 pore 

 near each 8-shaped pore at ends of row. 1-3 near each 8-shaped pore elsewhere ; 

 disk pores dorsad of 8-shaped pores and much loss numerous than these, 

 terminating near the penultimate pair of 8-shaped pores. 



Dorsal surface: 8-shaped p<ires scattered: the posterior pores 8-9 fx long and 

 5 wide, the majority of the others 12-13 n long and 8-9 wide : minute 8-shaped 

 pores absent; disk pores fairly numerous: tubular ducts 40 /x long. 



Ventral surface : Antenna thimble-shaped, with 2 setae as long as diameter 

 of antenna : beak with 3 pairs of setae; spiracular bar expanded at inner end; 

 71-99 quinquelocular pores extending from spiracle to body margin in a row 

 4-14 pores wide, the row widest toward margin; multilocular pores, with 10 

 loculi, in 4 complete rows, the posterior row with 11-17 pores, penultimate 

 row with 10-15, next with 10-12, and the anterior row with 0-10. the total 

 being 42—17: around 25 dark-rimmed 8-shaped pores in a loose row surrounding 

 mouth parts, some scattered on anterior end. and others arranged in 4 trans- 

 verse rows on abdomen, 3 of them wide and 1 narrow; submarginal 8-shaped 

 pores well removed from margin, arranged in an irregularly double row termi- 

 nating near the second row of multilocular pores, 1 or 2 opposite each or every 

 other marginal 8-shaped pore; submarginal setae in a complete row terminating 

 nearly directly anterior to the penultimate pair of marginal 8-shaped pores ; 2 

 pairs of setae in the posterior row of multilocular pores. 1 pair in each of the 

 other rows, and 1 pair before anterior row. 



Apex of abdomen: Setae, apical 40 y. long, apparently normally with an inter- 

 apical seta. 1 of the specimens examined with one 3.0 y. long entad of one apical 

 sera and the holotype with a suggestion of a setal base entad of one apical seta : 

 anal opening ventral, well removed from body margin, circular, its margin 

 sclerotized. apparently with or without setae, holotype with 1 seta ."» u long on 

 anterior edge. 



Larva. — Elongate ovoid. 



Margin: With 2^ 8-shaped pores, the posterior pair slightly larger than others, 

 axes of all longitudinal: 2 pairs of setae at anterior end. 



Dorsal surface: 8-shaped pores in a submedian row of 3-6 and a lateral row of 

 9. on each half of body, the total in specimens examined being 26 :'><*. individual 

 pores one-third larger than marginal pores: a disk pore just posterior to each 

 8-shaped pore of the lateral row; a pair of minute setae anterior to anterior 

 pair of submedian 8-shaped pores. 



Ventral surface: Antennal setae. I. 1: IV. 1: V. 0: VI. 2 long. 2 stout. 2 fairly 

 Stout, 2 slender: distance between antennal bases about equal to one-half length 

 of antenna: beak with 3 pairs of setae at tip : anterior spiracle with 2 

 trilocular pores or with 1 trilocular and 1 quadrilocular or quinquelocular pore, 

 posterior spiracle with 1 trilocular pore; leg setae, coxa ."». femur 1 on inner 

 margin near base, tarsus 1 each on inner and out-! 1 margins; tibia one-fourth as 

 long as tarsus; 8 pairs of submarginal 8-shaped pores, of which 1 pair is befrw 

 28( »72Q —41 12 



