OBSERVATIONS ON SCALE-INSECTS (COCCIDAE) — IV. 17 



sometimes to touch or slightly overlap each other ; about two-thirds the length of 

 the marginal spines; 8-shaped pores generally distributed but most numerous 

 towards the margin. Two divergent rows of cribriform plates (fig. 10, e 2 ), four on 

 each side of the median line ; these are circular, with labryrinthiform gratings, the 

 diameter about three times as great as the length of the 8-shaped glands. Anal 

 segment (fig. 10, /) with rather prominent lobe-like extensions and a broad bilobed 

 plate below the anal aperture, each with a pair of very short subapical spines and 

 two long marginal hairs. Pre-anal plate with a very deep emargination. Anal ring 

 with ten hairs. 



Larva. Elongate. Antennae stout, of six segments ; 3rd and 6th longest, but 

 both relatively short. Marginal spines minute. Anterior stigmatic spines similar 

 to those of the adult ; posterior pair absent. Legs robust ; anterior tarsi much 

 longer than the tibiae. The 8-shaped pores in well-defined longitudinal rows. Anal 

 lobes similar to those of the adult, but the terminal bristles are much longer. Anal 

 ring with six hairs. 



South Africa : Pretoria, 1914 (E. d?Emmerez). 



This insect is related to Lecaniodiaspis africana, Newst.,* but is still more remark- 

 able in having the legs normally developed. It differs moreover in its smaller size, 

 the presence of marginal and stigmatic spines, the extraordinarily long tarsi, the 

 antennal formulae, the character of the " cribriform plates," and in other details. 



Phenacoccus ballardi sp. nov. 



Female, adult. Dorsum, in dried example, covered with a felted mass of white 

 secretion, completely obscuring the segmentation ; margin with a conspicuous fringe 

 of extremely long, white appendages, which are shortest in front ; those arising 

 from the cephalic margin about three times the length of the felted dorsal area. 

 Length, inclusive of the fringe, 10 mm. 



Form, after maceration in potash, slightly elongate- ovate. Antennae of nine 

 segments, the articulation of the 3rd and 4th less pronounced than the rest. Eyes 

 small, but prominent. Legs slender, longer than the antennae ; tarsal digitules 

 simple bristles ; those of the claw very long and dilated ; two strong apical spines 

 on all the tarsi. Margin with a complete series of inconspicuous spinose tubercles 

 the spines short and truncate ; between them and surrounding them a number of 

 large circular pores ; two or three long hairs accompany each of the abdominal groups 

 of spines. Anal lobes similar to the marginal ones. Anal ring with six hairs. Inte- 

 gument with a few minute scattered spines and small circular pores, the latter most 

 numerous on the terminal abdominal segments. Length of macerated specimens, 

 1-7-2 mm. 



Female, second stage. The marginal appendages similar in their arrangement 

 to those in Pseudococcus (Dactylopius) longispinus (Targ.) ; but they are much 

 longer and arranged radially; posterior pair longest. Form, after maceration, 

 elongate. Antennae of six or seven segments. Marginal series of spinose tubercles 

 not so clearly defined as in the adult. Integument with numerous minute spines ; 

 and there are two or three very long hairs arising from near the anal spinose lobes. 



* Bull. Ent. Res., ii, p. 100, fig. 13 (1911). 

 (C365) b 



