Hylurgops, IN

Mandelshtam, M. Yu. & Petrov, A. V., 2019, A key to species of the tribe Hylastini LeConte, 1876 (Coleoptera: Curculionidae: Scolytinae) from Russia and adjacent countries, Russian Entomological Journal 28 (4), pp. 389-399 : 394-397

KEY TO THE SPECIES OF HYLURGOPS IN RUSSIA AND NEIGH- BORING COUNTRIES.

1. First and third elytral declivital interstriae elevated; second interstriae impressed. All interstriae in posterior half of elytra with single rows of loosely set pointed tubercles and long erect setae. Body color uniformly light red. 4.3– 4.5 mm .................................................. H. interstitialis

— None out of declivital interstriae elevated, all interstriae of same height .................................................................. 2

2. Second elytral declivital interstriae without tubercles and raised setae, covered with dense scales only. Elytral interstriae in basal half of elytra with dense recumbent golden hair-like setae, very short and sparse inclined erect setae are present only on declivity, sometimes in obscure rows. Body color very dark brown, nearly black. Beetles robust ( Fig. 20 ), 4.5–5.5 mm ................... H. glabratus

— All elytral declivital interstriae with small tubercles and erect or inclined hair-like setae. Elytral interstriae in basal half of elytra with sparse recumbent hairs, or declivity with conspicuous erect or inclined setae, or beetles bicolored. Beetles usually smaller ....................................... 3

3. Upper side of beetles uniformly colored, blackish-brown or reddish brown with the exception of black head .... 4

— Upper side of beetles usually bicolored, head and pronotum black, elytra dark-red or rusty red, anterior pronotum margin rufous ............................................................... 5

4. Each interstria in apical half of elytra and on declivity with single row of long thin erect hair-like setae oriented nearly vertically, each hair length exceeding width of interstria.

Elytral striae deep and wide, interstriae of same width as striae or slightly wider. Beetles shorter and wider, elytra wider posteriorly, 1.5x as long as wide. 3.2–4.0 mm ....

................................................................ H. longipillus * * All dissected H. longipillus specimens were males and all H. spessiwzeffi specimens were found to be females. It may turn out that these morphologically different forms represent only one biological species.

17 18

— Each interstria in apical half of elytra and on declivity with single row of short thick inclined, semi-recumbent bristle-like setae much shorter than interstrial width. Elytral interstriae significantly wider than striae. Beetles long and slender, with sides parallel, elytra 2x as long as wide. 3.5–4.5 mm ........................................... H. spessiwzeffi

19

5. Body larger 4.0–5.0 mm. Inclined erect, conspicuous bristle-like setae narrowing apically, often of reddish shade present in apical half of elytra and on declivity only, each interstria with one row of erect setae. Interstriae 1.5– 2.0x wider than striae, in the anterior half look glabrous, microscopic setae covering interstriae in anterior half of elytra inconspicuous and only barely noticeable. Body surface shining, whole body blackish-brown, broad ..... ......................................................... H. transbaicalicus

— Body smaller, less than 3.2 mm. Both basal and apical halves of elytra with rows of inclined erect interstrial bristle-like setae. ..........................................................6

6. Interstriae along whole elytral length from base to apex with one row of inclined erect hair-like setae. Besides, anterior two thirds of elytra with recumbent setae or hair-like scales (in old rubbed beetles these recumbent setae may be partially lost), declivity with dense scales. Beetles reddish-brown, only head may be black. Beetles at least faintly shining. Front with or without longitudinal carina. 2.0– 3.2 mm ................................................ H. palliatus

— Elytra without ground scales and hair-like ground vestiture, only with rather short erect hair-like setae forming one interstrial row on elytral disc and 1–2 rows on declivital interstriae. Beetles almost opaque. Front without longitudinal carina. 2.0 mm .................. H. inouyei

Figures

Figs 12–20. Habitus and details of bark beetles of the genus Hylastes and Hylurgops:12, 15, 17 — Hylastes substriatus; 13 — Hylastes ater; 14 — Hylurgops palliatus; 16 — Hylastes attenuatus; 18 — Hylastes cunucularius;19–20 — Hylurgops glabratus; 12 — protibia and tarsus; 13–14 — tarsi; 15–16 — head; 17–19 — pronotum; 20 — habitus, dorsal view. Рис. 12–20. Габитус и детали строениЯ короедов родов Hylastes и Hylurgops: 12, 15, 17 — Hylastes substriatus; 13 — Hylastes ater; 14 — Hylurgops palliatus; 16 — Hylastes attenuatus; 18 — Hylastes cunucularius; 19–20 — Hylurgops glabratus; 12 — переднЯЯ голень и лапка; 13–14 — лапки; 15–16 — голова; 17–19 — переднеспинка; 20 — габитус, сверху.