Toxorhina (Ceratocheilus) formosensis Alexander, 1928

Zhang, Xiao, Li, Yan & Yang, Ding, 2015, A review of the genus Toxorhina Loew from China, with descriptions of three new species (Diptera, Limoniidae, Limoniinae), ZooKeys 480, pp. 59-80 : 62

Taxon classification Animalia Diptera Limoniidae

Toxorhina (Ceratocheilus) formosensis Alexander, 1928 Figs 1, 2

Ceratocheilus formosensis Alexander 1928: 479. Type locality: Mt. Rantaizan, China (Taiwan).

Diagnosis.

Rostrum shorter than wing. Prescutum brown with three broad dark brown stripes. Pleuron generally dark brown. Wing tinged pale grey; R2+3 ending beyond end of basal section of R4+5, basal section of CuA1 before fork of M. Abdomen Generally brown to dark brown. Gonostylus stout and entirely blackened, outer lateral angle with a slender rod. Rods of aedeagus long.

Description.

Male. Body length 4.2 mm, wing length 5.2 mm, rostrum length 4.0 mm.

Head (Fig. 1b). Brownish black. Hairs on head black. Antenna length 0.4-0.5 mm, black. Pedicel enlarged and nearly globose. First flagellomere subconical; remaining flagellomeres cylindrical, each flagellomere longer and slenderer than previous one, terminal two flagellomeres longest with several long hairs. Rostrum black with black hairs.

Thorax. Generally brown to dark brown. Pronotum brown. Prescutum brown with three broad dark brown stripes. Scutum dark brown with middle area paler. Scutellum and mediotergite brown (Fig. 1c). Pleuron (Fig. 1a) generally dark brown. Hairs on thorax dark brown. Coxae and trochanters brownish yellow; femora dark brown with bases paler; tibiae and tarsi dark brown. Wing (Fig. 1d) tinged pale grey; veins pale brown. Venation: Sc1 ending nearly at origin of Rs, Sc2 near its tip; R2+3 ending beyond end of basal section of R4+5; basal section of CuA1 before fork of M; A1 curved relatively smooth. Haltere length 0.7 mm, pale brownish yellow with knob darker.

Abdomen (Fig. 1a). Generally brown to dark brown. Hairs on abdomen dark brown.

Hypopygium (Fig. 2). Gonocoxite conical, relatively short and stout. Gonostylus stout and entirely blackened, outer lateral angle with a slender rod. Interbase compressed and slightly curved to aedeagus, tip blunt. Aedeagus with tip divergent, rods long filiform.

Female. Unknown.

Specimens examined.

Holotype male (USNM), China: Taiwan, Mt. Rantaizan (1829 m), 1927.VI.3, Syuti Issiki. (One wing and hypopygium are mounted on a similarly labeled microscope slide. Two fore legs and two mid legs are still attached to the dry mounted body, and two hind legs are absent.)

Distribution.

China (Taiwan).

Remarks.

For description and illustration of this species, also see Alexander (1928).