Sirex ermak ( Semenov, 1921 )

3.3.4. Sirex ermak ( Semenov, 1921)

Figure 13 View Figure 13

Paururus ermak Semenov, 1921 , Russkoe Entomologicheskoe obozrenie, 17 [1917]: 92. (original description)

Sirex ermak Semenov : Benson, 1943, Bulletin of Entomological Research 34: 30–32. (listed)

Sirex ermak Semenov : Xiao et al., 1992, Economic Sawfly Fauna of China: 38–42. (described, figured, keyed)

Sirex ermak Semenov : Xiao & Wu, 1983, Memoir of Forest Entomology: 2–5. (described, figured, keyed)

Material examined.

4 ♀ Kadelate Village , Fuyun Country, Altai, Xinjiang, 2023-VIII-31, Ren L leg. ; 6 ♀ 4 ♂ Kadelate Village , Fuyun Country, Altai, Xinjiang, 2024-VII-28 ~ 30, Ren L leg. ; 4 ♀ Tiereketi Village , Habahe County, Xinjiang, 2017-VIII-5, 1035 m, Gao T and Lu ZB leg.

Diagnosis.

Females with forewings more or less darkened at least in the middle part (Fig. 13 A, B View Figure 13 ); vein 3 A of forewings basally present (Fig. 13 B View Figure 13 ); antennae completely blackish (Fig. 3 E View Figure 3 ); legs largely darkish; tarsal pad of metatarsomere 2 about 0.8 times as long as ventral length of tarsomere (Fig. 7 C View Figure 7 ). Males with flagellar basally yellowish (Fig. 3 F View Figure 3 ); abdomen segments I – III and VII – IX blackish, IV – VI light yellowish (Fig. 9 F View Figure 9 ). Metafemur largely blackish with a yellowish spot developed apically (Fig. 13 E View Figure 13 ).

Female Description.

Color: Head and thorax blackish with dark blue metallic reflections (Fig. 13 A, C View Figure 13 ). Antennae and palpi dark brownish to blackish (Fig. 3 E View Figure 3 ). Legs with coxae and femora black with dark blue metallic reflections, tibiae and tarsi dark brownish. Forewings with basal half almost clear and apical half pale brownish hue, sometimes with brownish moderately deepening before pterostigma, thus forms vague brownish bands (Fig. 13 B View Figure 13 ). Abdomen blackish with terga I and IX dark bluish metallic reflections while terga II – VIII dark purple metallic reflections in dorsal view (Fig. 9 E View Figure 9 ). — Head: Genae with pits 0.7–3.0 pit diameters apart (Fig. 6 E View Figure 6 ), vertex and postocellar area with pits less than 3.5 pit diameters apart (Fig. 5 E View Figure 5 ), and each pit diameter about 0.2–0.5 times as lateral ocelli. — Thorax: Mesoscutum with coarse net-like pits on median area, with indistinct transverse and longitudinal ridges in coarsely pitted area. Metatarsomere 2 in lateral view about 2.3–2.5 times as long as height, length about 1.15–1.25 times length of tarsomeres 3 + 4; tarsal pad about 0.8 times as long as ventral length of tarsomere (Fig. 7 C View Figure 7 ). Forewings vein 3 A basally present (Fig. 13 B View Figure 13 ). — Abdomen: Median basin of tergum IX with basal width 0.8–0.9 times as long as median length, maximum width 1.1–1.2 times as long as median length, median length 0.8–0.9 times of cornus length. Cornus in dorsal view short, with edges straight and angulate midway, its median length 1.0–1.2 times as long as maximum width of abdomen at junction of terga IX and X. Sheath. Basal section 1.04–1.10 times as long as apical section. Ovipositor. Pits near middle of annuli (the area at base of apical section of sheath) 0.06–0.1 times as long as annulus (Fig. 10 C View Figure 10 ), pits moderately decreasing in size toward ovipositor base, about 0.37 times as high as lancet height in lateral view, 0.5–0.6 times as long as pits height.

Male Description.

Color: Head, thorax and coxae black with dark blue metallic reflections (Fig. 13 D, E View Figure 13 ). Antennae with scape and pedicel blackish, flagella basally yellowish from flagellomere 1 to flagellomere 3–5, distal part of flagellar darkish (Fig. 3 F View Figure 3 ). Fore and mid legs with femora blackish (sometimes fore femora grades to brownish-yellow apically), tibiae and tarsi yellowish. Hind legs mostly blackish except a yellowish spot on the apical part of femora and metatarsomeres 4–5 yellowish. Forewings tinted light yellow and slightly pale brownish near outer margin. Abdomen with segments I – III and VII – IX black with dark blue metallic reflections, segments IV – VI light yellowish (Fig. 9 F View Figure 9 ). — Thorax: Metatibia about 4.1–4.2 times as long as maximum width (Fig. 8 C View Figure 8 ). Metatarsomere 1 in lateral view 3.3 times as long as maximum height.

Distribution.

Qinghai (Huzhu County, Banma County); Xinjiang (Fuyun County, Buerjin County).

Host.

Picea obovata ; Larix sp.

Note.

A species distributed in both eastern and western China but not recorded in central China (Fig. 19 View Figure 19 ). This species is similar to S. nitobei but can be distinguished from all Chinese Sirex based on the basally presence of vein 3 A.