S. Mahunka szerk.: Folia Entomologica Hungarica 44/2. (Budapest, 1983)

The second instar larva: In life yellow in colour. In mounted specimens body oval, about 0.760-1.085 mm long. Frons slightly sinuated, median frontal tubercle a little higher than lateral frontal tubercles. Head, pronotum, antennae, legs, siphunculi and cauda sclerotized; other thoracic tergites and abdominal ones colourless. Transverse rows of imbrication on abdominal tergites absent. Abdominal tergites bearing numerous fine hairs about 0.040 mm long. Antennae usually 5 jointed, about 0.3-0.6 times as long as the body. Length of antennái joint from the third to the fifth as: 0.080-0.150, 0.040-0.060, 0.050-0.060 for basal part and 0.080-0.130 for processus terminális. Third antennái joint without secondary rhinaria and bearing 2-4 hairs. Processus terminális 1.3-2.6 times as long as base of joint V, and 0.5-1.6 times of the length of joint III. Tip of rostrum generally reaching to the middle of hind coxae; ultimate rostral joint about 0.0700.080 mm long, about 0.8-0.9 times as long as second joint of hind tarsi. Siphunculi short,conical, about 0.045-0.060 mm long, about 0.04-0.08 times as long as body length and about 0.5-0.7 times length of second joint of hind tarsi. Cauda semi-circular, about 0.035-0.045 mm long, bearing 2 hairs, 0.4-0.6 times as long as basal width. Hind tarsal joint II about 0.090 mm long. First tarsal joint with 3,3,2 hairs. (Measurements see Table 3.). The third instar larva: In life yellowish green or green in colour. In mounted specimens body oval, about 1.178 to 1.566 mm long. Frons slightly sinuated, median frontal tubercle a little higher than lateral frontal tubercles. Head, pronotum, antennae, legs, siphunculi and cauda sclerotized; brown, other thoracic tergites and the abdominal ones colourless. Transverse rows of imbrication on abdominal tergites absent. Abdominal tergites bearing numerous fine hairs about 0.030-0.040 mm long. Marginal tubercles present on mesothorax, pear shaped; mesosternal processes absent. Tergite VIII bearing 6-7 hairs with filamentary apices, placed in a row on posterior margin pari;: about 0.050 mm long, 1-3 times as long as basal diameter of antenna! joint III. Antennae usually 5 jointed, about 0.3-0.5 times as long as the body. Length of antennái joint from the third to the fifth as: 0.150 to 0.200, 0.050-0.065, 0.070 for basal part and 0.090-0.135 for unguis, usually without secondary rhinaria on the third joint. Processus terminális 1.3-1.9 times as long as base of joint V, and 0.5-0.9 times of the length of joint III. Tip of rostrum generally reaching to the top of hind coxae; ultimate rostral joint about 0.070-0.080 mm long, about 0.7 times as long as second joint of hind tarsi. Siphunculi conical, with a circular incision below the flange, about 0.065-0.070 mm long, about 0.04-0.06 times as long as body length and 0.6 times of second joint of hind tarsi. Cauda semi-circular about 0.040 mm long, about 0.5 times as long as its basal width, bearing 4 hairs. Legs bearing numerous fine hairs. Hind tarsal joint II about 0.110 mm long. First tarsal chaetotaxy: 3,3,2. (Measurements see Table 3.). The fourth instar larva: In life green in colour. In mounted specimens body oval, about 1.519 to 1.829 mm long. Dorsal sclerotization as in the third instar larva. Tergite VIII bearing 7 hairs about 0.060 mm long, 2.0 times as long as basal diameter of antenna! joint III. Antennae 6 jointed, about 0.3-0.5 times as long as the body. Length of antennái joint from the third to the sixth as: 0.110-0.230, 0.070-0.130, 0.060-0.105, 0.070-0.090 for basal part and 0.125-0.180 for unguis; usually without secondary rhinaria on the third joint. Processus terminális 1.4-2.6 times as long as base of joint VI, and about 0.5-1.6 times of the length of joint III. Third antenna! joint divides during moulting, giving the third and the fourth joint. Tip of rostrum generally reaching beyond the middle coxae; ultimate rostral joint about 0.080-0.085 mm long, about 0.6-0.8 times as long as second joint of hind tarsi. Siphunculi conical, with a circular incision below the flange, about 0.070-0.090 mm long, about 0.04-0.06 times as long as body length and 0.5-0.8 times of second joint of hind tarsi. Cauda sime-circular about 0.050-0.060 mm long, about 0.5-0.6 times as long as its basal width, bearing 4 hairs. Hind tarsal joint II about 0.110-0.130 mm long. First tarsal chaetotaxy: 3,3,2. (Measurements see Table 3.). The morphological features of B. amygdalinus (Schout.) illustrated some remarkable variation as compared to that of B. cardui (L. ) and B. schwartzi CB as described by DARWISH (1982) in both life and mounted specimens. In this respect, in the first instar larva of B. amygdalinus the number of joints of antenna was 5 as in B. schwartzi versus 4 in B. cardui

. In apterous viviparous adult female of B. amygdalinus the III antennái joint was with 0-13 secondary rhinaria versus with 0-4 secondary rhinaria in B. cardui and versus without secondary rhinaria in B. schwartzi. The first tarsal chaetotaxy in B. amygdalinus was 3,3,2 in all stages contrary to that in B. cardui which was 2,2,2 in all stages and in B. schwartzi was 3,3,3 in all stages except the first instar larva which was 2,2,2.