Ortheziincs. 419 



hindermost two pairs are approximated and situated close to the anal orifice 

 (see fig. 5). Uerm with large, circumscribed ceriferous tracts crowded with 

 stout, curved, tapering spines {fig. ii), corresponding with the areas supporting 

 the waxy processes. The naked areas of the dorsum are sparsely sprinkled 

 with small quadrilocular or quinquelocular pores. Dimensions of denuded 

 insect : length i"5 mm., breadth i to r3 mm. 



The ovisac, which is firmly attached to and carried about by the insect, 

 tapers slightly from the base to the truncate extremity, whei'e there is a large 

 aperture through which the larva; make their escape. It is of a firm but brittle 

 texture and, in fully developed examples, describes a gradual curve of which the 

 concavity is uppermost (see fig. 3). It is longitudinally ribbed above {fig. 2) and 

 transversely banded below {fig. 4). In well -developed examples the ovisac 

 extends to a length of from 4"5 to 6 mm. 



Nymph very similar to adult ; but with seven-jointed antenna". Young larva 

 {fig. 7) pale green, with a median series of V-shaped white waxy patches and 

 slight indications of marginal processes ; antennae {fi^. 8) six-jointed. 



The eggs, which are carried within the ovisac, packed in a loose cottony 

 matter, are at first almost white. They soon deepen to yellow, then orange, and, 

 just before the emergence of the larva, become of a greenish tint. 



Adult male (figs. 15, 16) slaty gray, dusted with greyish white powdery 

 matter. Wings greyish white, the nervures and costal margin brownish, A 

 long tuft of delicate, silky, colourless filaments springs from the dorsum of the 

 antepenultimate segment, extending backwards to a length equalling or ex- 

 ceeding that of the insect itself. Antennas nine-jointed, very long and slender, 

 considerably longer than the body of the insect ; the first two joints short, the 

 remaining seven greatly elongated ; a longish slender spine at the apex of the 

 ninth {fig. 20) ; all the joints clothed with short hairs. Legs long and slender; 

 tarsus approximately one-quarter the length of tibia, and much longer than 

 femur ; claw {fig. 21) slender and acutely pointed. Eyes large and prominent, 

 lateral, moruliform {see figs. 17, 18); a single lateral ocellus immediately 

 behind each eye. Halteres {fig. 19) with thickened costal margin ; a single, 

 longish, hooked bristle at the distal extremity. Abdomen with the dorsum 

 membranous ; the venter with transverse chitinous plates. Penis {see fig. 22) 

 large, falciform, densely chitinous. Dorsum of antepenultimate segment with a 

 transverse cluster of about thirty tubular pores, which give rise, in the living 

 insect, to the caudal tuft of filaments. Each pore, viewed in profile {fig. 23), is 

 seen to project above the surface of the body for about one-third of its length ; 

 when viewed vertically the pores have the appearance shown at figure 24, the 

 pattern being produced by internal ribs, which are strongest at the inner 

 extremity but fade out on the walls of the tube. There are four pairs of 

 abdominal spiracles, situated on the penultimate and preceding three segments, 

 and opening on to the lateral area. Membranous areas of the body with large, 

 circular, trilocular (occasionally quadrilocular) pores {fig. 25), arranged in 

 transverse groups and series on the abdomen. Length (exclusive of filaments) 

 2 mm. 



The male insect, after the first moult {figs. 26, 27, 28) is readily distinguish- 

 able from the early stages of the female. It is of a pale green colour, without 

 waxy processes, but enveloped in loose woolly secretion. In the advanced 

 nymphal stage {fig. 28) the antennas are nine-jointed and are folded back along 

 the sides of the body ; wing-pads are apparent in this stage. It has long, well- 



