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

FOLIA ENTOMOLOGICA HUNGARICA ROVARTANI KÖZLEMÉNYEK XLII (XXXIV). 1. 1981 p. 203-207 Acanthomytilus hungaricus sp. n. and some new scale insects in the Hungarian fauna (Homoptera: Coccoidea) By G. VINIS (Received December 15, 1980) Abstract: Description of Acanthomytilus hungaricus sp.n., mature female and instars Li and L2 depicted. Three scale insects new to the Hungarian fauna reported. In the years of 1979 and 1980 a survey was carried out in Budapest and in other large towns of Hungary in order to ascertain the scale insects living on arborescent plants of parks and street trees. This resulted in the discovery of a new species : Acanthomytilus hungaricus sp.n. In the identification of the species the keys of BALACHOWSKY (1954) and BOBCHSENIUS (1950) have been used. Family: Diaspididae 1. Acanthomytilus hungaricus sp.n. (Figs. 1-3) Holotype: March 26, 1980. Budapest, Acer campestre; female specimen recovered from a twig; mounted on slide deposited in the Zoological Department, Hungarian Natural History Museum, Budapest; Paratypes: Same data as for holotype; 8 females on 7 slides deposited in the Laboratory of the Horticultural Company of Budapest; 2 females on 1 slide in the Institute for Plant Protection; 2 females on 1 slide and dry material (mature females on twig) in the Muséum National d'Histoire Naturelle, Paris. Mature female with a shell-like scale, somewhat distending towards abdomen, cephalad with two larval skines. Scale 0.5-1.0 mm long, 0.2-0.3 mm wide. Young female 0.45 mm, when laying eggs 0,75 mm long, lilac in colour, elongate pyriform, céphalothorax and mesothorax the narrowest, abdomen broadest at 2nd segment. Pygidium rounded, sclerotized with a pair of well-developed lobes. Outer side of Li broadly excised. Diameter at base 16 microns, legnth 17 microns. Plates narrow, acuminate, those in first sinus reaching length of Ll

. Number of marginal macroducts on both sides five, basis 8 microns in diameter, height 17 microns. Dorsal ducts few, arranged in rows on pygidium and on abdominal segments, while on body margin clustered in small groups. Perivulvar pores form 5 groups, their formula: 2-4/1-6/2-5. At margin of vertro-abdominal segments nos. 1 to 3, 2 to 4 gland spines and 1 and 3 microductes present. Spiracles well developed, opening 9 microns in diam., bas 13. length 22 microns. One (rarely two) trilocular pore beside anterior spiracle. At posterior spiracle 3 gland spines. Microducts situated on meso- and metathroax in small groups along body margin. Base of antenna strongly sclerotized with 2 strong setae. Labium one-segmented, stylet loop reaching half body length (130 to 150 microns). On the basis of its biology, the species resembles Lepidosaphes minima (Newstead, 1897). Within the Acanthomytilus genus the new species is closely related to A. intermittens Hall. However, they differ from each other substantially in the number of lobes, that of marginal macroducts on pygidium, and that of plates. First_ instar larvae_(Fig. 2) possess well-developed legs and antennae. Antenna 6-segmented,