S. Mahunka szerk.: Folia Entomologica Hungarica 34/1. (Budapest, 1981)

Morphology 1 First instar larva: The males cannot be discerned in this stage; the body is 0.1-0.2 mm long. The antenna is 6-segmented, mean lengths of segments 1st: 18.9; Und: 25.2; III: 18.9; rvth: 15.7; Vth: 15.9; Vlth: 63.0 micron. The diameter of eye base is 18.9 microns. The labium is 3-segmented: 1st: 15,0; und: 25.0; ILIrd: 35.0 microns. The first segment bears 3, the second 1, the third 16-18 short, thin setae. The stylet loop is longer than the body. The legs are well developed, with a denticle on the claw. The setae on the claw are longer than the claw, distally slightly extended. The thoracal spiracles are well developed. There are no cerarii. From the dorsal ostioles the anterior pair is missing, the posterior pair is well developed. The anal opening is circular, with 6 setae and a row of pores. The discoidal pores are 3- and 5-locular. The 3-locular pores can be found in low numbers on the dorsal side and beside the thoracal spiracles . The 5-locular pores can be found on the ventral side of the céphalothorax, next to the mouth parts and thoracal spiracles and on the l-5th abdominal segments, 6 pores on each; on the 6th abdominal segment 4, on the 7-8th segments 2 pores each are located .Tubular ducts can be found in low numbers beside the antennae, the thoracal spiracles and on the body sides (Fig. 1). Second instar larva: The males and females cannot be discerned. \The body is raspberry-coloured, covered with light wax powder, body length 1.0-1.1 mm. The antenna is 6-7 segmented: 1st: 28.4; Und: 23.6; Illrd: 23.6; IVth: 2i

. 2; Vth: 22.0; Vlth: 22.0; and Vllth: 34.7 microns. The labium is 3-segmented, the stylet loop is longer than the body. The legs are thick, short. The claws bear a denticle, the setae on the claws are longer than the claw, slightly distended at their distal end. The posterior dorsal ostiole is well developed, the anterior one is not present. The discoidal pores are 3- and 5-locular. Further 3-locular pores can be found on the dorsum and on the ventral side of the céphalothorax, 5-locular ones are scattered on both sides. Tubular ducts are on the head, next to the thoracal spiracles and on the sides of the abdomen. The anal opening is circular with a row of thin-walled and an other row of thick-walled pores and 6 setae. On the ventral side of the anal appendix one long and 2-3 shorter setae can be found. On the place of C 18, two short setae and 3-4 three-locular pores are situated (Fig. 2). Pronymph of wingless male: This form is without mouthparts, with 8 (rarely 9) segmented antennae, the segmentation is barely visible. The legs are thick, the claws are small. The thoracal spiracles are not well developed, accompanied by 3-, 4, and 5-, rarely multiocular pores. Multiocular pores are located along the body margin on the ventral side of the abdomen and scattered singularly on the dorsal side. The tubular ducts are scattered on the céphalothorax and beside the thoracal spiracles while the ones on the dorsum and on the ventral abdominal segments are ordered in rows. On the metathorax smaller or larger protuberances or bulges (wing rudiments) are situated (Fig. 3). Pronymph of the winged male: This form differs from the wingless pronymph by the well marked wing pads and by the lower number of tubular and discoidal pores (Fig. 4). Nymph of the wingless male differs from the pronymph of the wingless male by the lower number of discoidal pores and by the absence of tubular ducts. The segmentation of the antennae is barely visible. The claws are small and on the mesothorax a more or less conspicuous bulge (wing rudiment) is visible (Fig. 5). Nimph of the winged male Is characterized by a low number of discoidal pores. The segmentation of the antennae is not conspicuous, the claws are small. The thoracal spiracles are undeveloped, the wing pads are well visible (Fig. 6). Male: a/ Neotaenic form. Its colour Is pale raspberry; the movement is active. Body shape resembling the L2 larva, length 0.8-1.1 mm, width 0.45-0.50 mm. Antenna of 9 (rarely 8) segments, densely covered with setae. Average lengths of segments: 1st: 28.4; Ilnd: 41.0; Illrd: 28.4; IVth: 28.4; Vth: 31.6; Vlth: 25.2; Vllth: 27.0; Vinth: 31.5 and Kth: 44.1 microns. Two pairs of eyes developed, one is larger than the other pair. The thoracal spiracles are well visible, accompanied

'by 1 three-locular pore each. The legs are well developed, with a denticle on the claw. The discoidal pores are not well developed, situated singly in small numbers on the head and beside the abdominal ostioles and in groups in the cerarium next to the genital apparatus; the pores are 3-, 4-, and 5-locular. On both sides of the body many setae can be found (Fig. 7). b/Wingless form is 1.0-1.1 mm long, 0.35-0.45 mm wide, with a 9-segmented antenna. The body barely divided into head, thorax and abdomen. On the mesothorax slightly sclerotized transverse bars and on the two sides bulging wing rudiments are situated. The legs are long, slender, the claw with a denticle. The discoidal pores are restricted to the cerarium next to the genital apparatus, where also 2 long and 1 or 2 short setae grow. The body is provided with setae on both sides (Fig. 8).