Hesperinus cuspidistylus Hardy et Takahashi, 1960

Krivosheina, N. P., 2024, FIRST RECORD OF HESPERINUS CUSPIDISTYLUS HARDY ET TAKAHASHI, 1960 (DIPTERA: HESPERINIDAE) FROM RUSSIA, Far Eastern Entomologist 502, pp. 8-11 : 10-11

Hesperinus cuspidistylus Hardy et Takahashi, 1960

MATERIAL. Russia: Khabarovsky Krai, region of Amur River estuary, “Ozerpakh fishery”, 24. VI 1915, 1♂, coll. V. V . Chernavin ( ZMUM) .

DESCRIPTION. Male. Predominantly dark colored species. Face, frons and occiput with rather dense gray pollination and sparse setose hairs. Base of flagellar segment 1 yellow. Scape and pedicel brownish. The antennae are generally densely pollinated with short yellowish-gray pubescens. Flagellar segment 1 is 4 times as long as scape and pedicel combined and about 2 times as long as flagellar segment 2 (4: 2.5). Palpi yellow-brown. Thorax brownish to black, the depressed area in front of the scutellum is grayish. Scutum with 3 light longitudinal stripes. The halteres are gray-yellow, the legs are yellow. The wing is light with a faint yellow-brown tint and transparent along the costal vein. The abdomen is dark brown to black, with dense gray-brown pollination, with short yellow hairs. The abdomen is almost 2 times longer than the head and thorax combined.

Genitalia with massive gonostyles curved almost at right angles, flattened at the apex after bending. Strong, long setae form a dense longitudinal row along the basal part and a longer and dense tuft at the bend ( Fig. 2 ). Gonocoxites longitudinally elongated. The apodeme of the aedeagus is well sclerotized and has a diamond-shaped, smooth base and an expanded posterior end in the form of a cap, covered with numerous denticles. It differs from the closely related species H. rohdendorfi and H. nigratus primarily in the structure of the gonostyles.

Female is unknown ( Hardy & Takahashi, 1960).

DISTRIBUTION. The species was described from the territory of the National Park in the center of Hokkaido ( Japan). Here H. cuspidistylus is recorded from Russia for the first time.

Figures

Figs 1–2. Male genitalia of Hesperinus spp., dorsal view. 1 – H. rodendorfi; 2 – H. cuspidistylus. Abbreviations: ap aed - aedeagal apodeme; gcx – gonocoxite; gst – gonostylus; t9 – tergite 9.