1900.] MB. B. NEWSTBAD ON A NEW SCALE-INSECT. 947 



7. On a new Scale-Insect from Zomba, British Central 

 Africa. By R. Newstead, F.E.S., Hon. Mem. R.H.S. 



[EeceiTed September 28, 1900.] 



(Plate LIX.) 



Walkebiana pebtlnax, n. sp. 



$ . Adult (PI. LIX. figs. 1,2,3) dark castaneous, slightly shining; 

 form above generally highly convex and evenly rounded, forming 

 an almost complete hemisphere, but one specimen was decidedly 

 more elongate and less convex ; cephalic area suddenly constricted, 

 much wrinkled and furrowed at the sides, and with 4-6 large, deep, 

 and variously-shaped punctures ; margin in front emarginate, and 

 within a broad, deep, upward-sloping, central groove, surmounted 

 on either side by a strongly-rounded ridge. Subdorsal and marginal 

 rows of very short, stout, dusky-white, waxy processes, placed 

 close together, and gradually lessening in size from the centre 

 towards the extremities ; there is also a double dorsal row of 

 much smaller processes, which also lessen towards the extremities, 

 the largest pair occupying almost a central position. Much mealy 

 substance is scattered round the base of the waxy processes, and 

 the hollows and wrinkles are covered with the same material. 

 Underside (fig. 3) flat or slightly concave, with radiating grooves, 

 more or less covered with white mealy secretion ; sides sharply 

 raised. Antennae (fig. 5, 5 a) of 10 joints, of which the terminal 

 one is much the longest, and, with the exception of the first, all 

 the joints are furnished with short, fine hairs : formula 10, 1, 2, 3 

 (4, 5, 6) (7, 8, 9). Legs (fig. 4, b) very small ; digitules to claw 

 simple. Rostral apparatus present, but owing to the density of 

 the surrounding tissues it is impossible to make out its true 

 character. Ventral opening (fig. 4) very large, somewhat hexagonal 

 and without marginal hairs, the whole aperture covered by a thin 

 anteriorly-hinged valve or flap (fig. 3) of dark brown secretionary 

 matter occupying approximately the area indicated by the dotted 

 line in fig. 4 ; the line of attachment being immediately beneath the 

 insertion of the posterior legs, its exact course being indicated by 

 large gland-tracks (fig. 4, a, a), the largest of which are hidden 

 beneath the legs. Epidermis covered with minute hairs and 

 circular glands. 



Long 14-20-50, wide 11-15, high 7-10 mm. 



Larva (figs. 6, 7) elongate ovate, above (fig. 6) with median, sub- 

 dorsal, and marginal bands of spiny hairs. Antennae (figs. 8, 8 a) 

 of 5 joints, of which 5 is equal in length to 2, 3, and 4 together : 

 formula 5, 3, 2, 1, 4. Legs very long and slender; digitules to 

 claw very fine simple hairs ; claws (fig. 9) faintly tridentate. 

 Anal ring without hairs. 



Pboo. Zool. Soc— 1900, No. LXII. 62 



