S. Mahunka szerk.: Folia Entomologica Hungarica 27/1. (Budapest, 1974)
In SZELÉNYI' s key (1956:171-172) Homoporus gusztavi runs to 22(23), the thorax being stout, but the antennae are quite different, much longer than in H.biroi SZELÉNYI. In DELUCCHI' s key (1957:404-408) it runs to the subgenus Phaenacra FÖRSTER and there to 38(35), which includes only H_. (robustus DELUCCHI=) semiluteus (WALKER) (H.bicolorus ERDOS, 1970 is a new synonym of H. semiluteus! ), a species with very short antennae. In GRAHAM' s key (1969:445-448) the female of H .gusztavi partly agrees with the first couplet which includes only H.semiluteus and is equivalent to DELUCCHI' s no. 38(35); the male would run to couplet 8, but clearly differs from the two species there mainly ba its much longer antennae, different colour of the gaster, conspicuous white pubescence of head and thorax, venation, etc. Homoporus gusztavi seems to form a species-group in the subgenus Phaena c ra F ÖR ST ER , characterised by yellow gaster in females, together with the two species mentioned above, viz. H. biroi SZELÉNYI and H. semiluteus (WALKER) . It may be easily distinguished by its unusually long antennae. There seem to exist two more undescribed species belonging to this species-group in Europe, known to me only in males. In both of them the base of the antenna and parts of legs are infuscate, the scapus is relatively shorter and in one of them (from S.France) the funicle is 8-segmented and the basal cell of fore wing is bare. In the other species (from Bulgaria) the basal cell shows sparce hairs but I cannot be sure about the antennae, as the tips are missing in the specimens available. Mesopolobus szelenyii sp.nov. Female: 1.52-1.75 mm. Bluish green to dark green, including coxae and most of femora; antennae testaceous, usually with last two funicular segments slightly paler; knees and tips of tibiae testaceous, tibiae infuscate in middle; tarsi whitish. Wings hyaline, fore wing with fuscous cross-fascia attached to darker parastigma (Text-fig. 9), venation beyond fascia very pale . For many dimensions of body see Text-fig. 9. Head 1.25-1.28 times as broad as mesoscutum, in dorsal view fully 2.1 times as broad as long, with almost no temples; in facial view nearly 1.3 times as broad as high, with genae fairly concerging and antennái toruli just below lower ocular line . Very fine reticulation becoming still finer on lower face and merging with fine striation of clypeus, lower margin of which is straight and without depressions. Left mandible 3-toothed, upper tooth truncate. Relative measurements: width of head 80, frontovertex 43, eye 38:30, malar space 21, mouth 33, scapus 33, flagellum plus pedicellus 60. Slender scapus ending one diameter below ocellus; pedicellus dorsally twice as long as broad, about as broad as apex of fifth flagellar segment and longer than any of five subquadrate to (gradually) slightly transverse funicular segments; third aneUus subquadrate; flagellum clavate; clava long-oval. Pronotal collar carinate anteriorly (except on sides), almost as broad, and medially about 0.18 as long, as mesoscutum; latter 1.9 times as broad as long, without any punctures. Scutellum very slightly transverse. Propodeum less than one-third as long as scutellum, shiny and almost smooth, with fine sharp median carina ending et elevated, broadly triangular nuchal strip; plicae sinaute, distinct though blunt and strigose
