Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 70. (Budapest 1978)

Kovalev, V. G.: Mongolian species of the Platypalpus albiseta-group (Diptera, Empididae)

The material for this paper was kindly placed at the author's disposal by DR. Z. KASZAB (Budapest). Specimens preserved in the collections of the Zoological Institute of the Academy of Sciences of the USSR (Leningrad) and of the Soviet-Mongolian Complex Biological Expedition (Moscow) were also examined. For the loan of materials author expresses his sincere gratitude to DR. Z. KASZAB, DR. E. P. NARTSHUK, DR. V. F. ZAITZEV, DR. I. M. KERZHNER, DR. M. A. KOZLOV (Leningrad) and Mrs. T. PUSTOVOJT (Moscow). 1. Platypalpus bipunctatus sp. n. (Figs. 1-5) Yellow species. Mesonotum shining, not dusted, with two black patches above bases of wings. cf (holotype). Head black in ground colour, with a coating of dark grey dust; frons in front silvery grey; upper part of occiput with a triangular patch of similar colour (as in P. albisela PANZER). Frons very linear, not as wide below middle as front ocellus, slightly widening above, and immediately before ocellar triangle narrower than distance between hind ocelli. Bristles dark brown, hairs pale yellow. Antennae black (both antennái segments 3 are missing. See description of 9 )• Palpi yellow, clothed in whitish pile, apically with a yellow or brown bristle. — Thorax reddish yellow with two oval blackish patches above bases of wings (Fig. 5); prothoracic notum (except for lower corners), a spot on anterodorsal corners of mesopleura and sternopleura (except for upper margin) blackish (in holotype sternopleura less darkened than in both paratypes, brown with blackish hind margin); prescutellar depression and front of scutellum may be a little obscured. Mesonotum and most of pleura shining; lateral margins of humeral calli, extreme side and hind margins of mesonotum, whole of scutellum and metathorax very faintly dusted whitish; upper margin of mesopleura and front part of its lower margin above fore coxae, upper margin of sternopleura (excluding a small area before middle), whole of pteropleura and hypopleura except for posteroventral angle with a covering of similar dust. Humeral calli only very slightly developed as in P. albiseta. Large thoracic bristles brown, hairs yellow. Mesonotum almost bare. Acr and dc hairs hardly visible, sparse; acr biserial over a broad median stripe being a little narrower than bare line between acr and dc. Dc uniserial, ending behind in one bristle. Two bristles and often an additional hair in notopleural depression. — W ings slightly brownish clouded especially on costal half, long. Veins from yellowish brown to dark brown. Costal bristle black. Apical sections of R

i+:> and M

1+2 divergent in basal half but only slightly convergent towards tip and almost parallel just before tip, 1.3-1.5 times as wide apart at middle than at tip. Cu

2 very recurrent as in P. albiseta. Squamae blackish with yellow fringes. — Legs yellow ; fore tibiae, fore and mid tarsi and last 2 or 3 segments of hind tarsi dark brown; fore femora above on apical half, hind tibiae, base of hind tarsi and sometimes tips of mid tibiae not so dark, light brown. Fore femora twice deeper than tibiae, anteroventrally on basal half with a row of short (about half as long as width of femur) pale hairs; posteroventrally over entire length with a row of yellow hairs of different lengths and with 2 or 3 fine brownish bristles about as long as width of femur. Mid femora stout, 1.6-1.8 times as wide as fore ones, in front over entire length with a row of 8-11 brown erect bristly hairs, anteroventrally with a row of 7-9 long (almost as long as width of femur) and other shorter black bristles. Hind femora ventrally on apical two-thirds with two rows of erect pale hairs. Tibiae slender. Fore tibiae a little thickened near base. Mid tibiae apically with a very small rim-like projection. Other pubescence on legs inconspicuous, rather erect and pale. — Abdomen brown, darker and more extensively shining above than below, clothed with scattered yellow hairs. — Genitalia (Figs. 1-3) moderate in size, about as long as segments 5 and 6 together, globular. Left periandrial lamella brown, obscured towards tip; right lamella yellowish brown with blackish tip; basal fusion of lamellae black. Periandrium with a faint clothing of whitish pile, polished only on blackish parts. Sclerotization of genitalia very uneven. 9 (paratype). Antennái segment 3 four times as long as wide; arista slightly thickened owing to pubescence, 2.4 times as long as segment 3. Legs yellow; fore tibiae brownish; whole of tarsi of anterior legs and last two segments of hind tarsi blackish. —• Bristles of posteroventral row on fore femora yellow and not so long as in male, much shorter than femur is wide. Hairs in both ventral rows on hind femora yellow. — Abdomen yellowish brown on segments 1 to 6; hind margins of sternites darkened. Segments 7 and 8 (Fig. 4) dark brown with base of sternites pale yellow. Segment 7 cylindrical in shape, a little longer than segments 6 and 8 taken separately; tergite 7 shining but side margins dusted with grey; sternite a little whitish pilose along hind margin; hind angles of tergite and sternite slightly produced, tooth-like; inner margins of these teeth connected with a grey membrane along nearly whole length. Segment 8 grey, conical; tergite produced apically. Cerci yellow, as long as segment 8. Length 1.9-2.5 mm (holotype 1.9 mm), wing 2.6 mm. Holotype cf '• Bajanchongor aimak, Talyn Bilgech bulag, Quelle zwischen Tost ul und Cagan Bogd ul Gebirge, 47 km O vom Grenzposten Caganbulag, 1200 m, 23. 6. 1967 (No. 838) leg.