Microchironomus brochus, Yan & Saether & Jin & Wang, 2008

Yan, Chuncai, Saether, Ole A., Jin, Zhaohui & Wang, Xinhua, 2008, Three new species of the Harnischia complex from the Sino-Indian Region, with a review of Demicryptochironomus Lenz (Diptera: Chironomidae), Zootaxa 1968, pp. 1-22 : 16-17

Microchironomus brochus sp. n.

( Figs 31–33)

Type material. Holotype male ( BDN No. 08223), CHINA: Fujian Province, Fuzhou City, Jinshan Town , 22.iv.1993, light trap, W. Bu . Paratypes ( BDN Nos 05245, 05246, 05247): 3 males, Fujian Province, Fuzhou Agricultural University , 22.iv.1993, light trap, W. Bu .

Diagnostic characters. The species differs from other members of the genus except M. nigrovittatus (Malloch) by having a slightly curved gonostylus. The broadly lanceolate anal point will separate the species from M. nigrovittatus .

Etymology. From Latin brochus , tooth, referring to the apical tooth on the gonostylus.

Male (n = 4, unless otherwise stated). Total length 3.75–4.03, 3.91 mm. Wing length 1.83–2.05, 1.96 mm. Total length/wing length 1.97–2.24, 2.03. Wing length/length of profemur 2.21–2.29, 2.26.

Coloration. Thorax yellowish brown to brown, with slightly darker brown vittae; mid preepisternum, median anepisternum, and anterior 1/2 of postnotum dark brown. Foreleg with femur yellowish brown with distal part dark brown, tibia and tarsi dark brown. Mid- and hind legs with femur, tibia and basal 1/2 of ta 1 yellowish green, remaining tarsi brown to dark brown. Abdomen with tergite I–V yellowish green, tergite VI–VIII yellowish brown and hypopygium dark brown.

Head. AR 2.21–2.56, 2.37. Ultimate flagellomere 720–810, 758 µm long. Frontal tubercles cylindrical, 9 (1) µm long, 3 µm wide; or rounded, 4 (1) µm in diameter; or absent (2). Temporal setae 17–20, 19 including 3–5, 4 inner verticals; 7–12, 10 outer verticals; and 3–6, 5 postorbitals. Clypeus with 11–14, 12 setae. Tentorium 120–132, 127 µm long; 40–55, 48 µm wide. Palpomere lengths (in µm): 30–43, 37; 45–50, 49; 138–165, 152; 163–165, 164; 215–243, 231. Palp segment 5/3 1.44–1.59, 1.52.

Thorax. Antepronotals 2–5, 4; acrostichals 8–11, 10; dorsocentrals 7–11, 10; prealars 4. Scutellum with 10–16, 12 (3) setae.

Wing ( Fig. 31). VR 1.16–1.18, 1.17. Brachiolum with 2–3, 2 setae; R with 5–12, 8 setae; R 1 with 3–6, 4 setae; R 4+5 with 5–13, 10 setae. Squama with 10–11 (2) setae.

Legs. Foretibia with 3 subapical setae, 108–130, 119; 120–162, 137; and 133–138, 136 (2) µm long. Spurs of midtibia 24–28, 26 and 25–30, 27 µm long; comb with 32–40, 36 teeth, 10–12, 12 µm long. Spurs of hind tibia 26–33, 30 and 35–36, 35 µm long; comb with 44–56, 51 teeth, 10–13, 12 µm long. Mid ta 1 without or with 1–2 (2) sensilla chaetica. Lengths and proportions of legs as in Table 2.

Hypopygium ( Figs 32–33). Tergite IX with 18–26, 23 setae at base of anal point. Laterosternite IX with 2–5, 3 setae. Anal tergite bands Y-shaped. Anal point originating from conical posterior margin of anal tergite; 93–100, 97 µm long, 20–23, 21 µm wide at base, 25–30, 27 µm wide medially, 8–11, 9 µm wide apically, apex rounded; with Y-shaped ridge extending to tergite IX. Superior volsella thumb-like, 55–75, 62 µm long, slightly widened distally; with 2 apicolateral setae in distinct pits. Phallapodeme 76–98, 87 µm long. Transverse sternapodeme 35–48, 43 µm long. Gonocoxite swollen, 75–80, 77 µm long; inner margin with 8–10, 9 strong setae. Gonostylus 203–225, 214 µm long; with apical tooth; widened basally, slightly curved in distal 1/3; inner margin with 16–22, 18 setae. HR 0.35–0.37, 0.36; HV 1.76–1.92, 1.83.

Distribution. The species was collected in a subtropical area in Fujian Province in China.