Silbomyia hoeneana Enderlein

Yang, Shih-Tsai, Kurahashi, Hiromu & Shiao, Shiuh-Feng, 2014, Keys to the blow flies of Taiwan, with a checklist of recorded species and the description of a new species of Paradichosia Senior-White (Diptera, Calliphoridae), ZooKeys 434, pp. 57-109 : 75-77

Taxon classification Animalia Diptera Calliphoridae

Silbomyia hoeneana Enderlein Figs 8, 10

Redescription.

Male. Head: Eyes dichoptic; frons index 0.42; frontal stripe yellow to yellowish-orange, very wide, about 4 times as wide as a parafrontal, black setulose on outer part; parafrontal yellow, silvery-yellow pollinose, with about 9 pairs of ori, reclinate ors 1, proclinate ors 2; parafacial yellow, silvery-yellow pollinose, bare, about 2 times as wide as width of AS3; face yellow, slightly yellowish pollinose; facial carina developed, rather short and broad, shorter than distance from lunule to median ocellus, more or less ridge-like, not fusiform, facialia yellow, slightly yellowish pollinose, with several black hairs above vibrissa; mediana yellow, silvery-yellow pollinose; vibrissaria yellow, with several strong bristles; vibrissa well developed; epistome yellow, not obviously demarcated from face; gena yellow, silvery-yellow pollinose, covered with yellowish-fuscous to brown hairs; peristomal bristles black and stout; postgena concolorous with gena, not demarcated from gena, with yellowish hairs; postorbits dark brown, bright silver pollinose; upper occiput dark brown to black, slightly silvery-gray pollinose, with black hairs, lower occiput yellow, silvery-yellow pollinose, with golden-yellow hairs; upper epicephalon yellow, concolorous with frontal stripe, lower part brown; AS2 yellowish to pale orange; AS3 yellowish to pale orange, yellowish white pollinose, about 3 times as long as AS2; arista fuscous brown, almost entirely long plumose; palpus pale orange, with black setulae.

Thorax: Metallic bluish-green to blue, with somewhat purplish tinge, slightly silvery-gray pollinose on dorsum and pleura; humerus, postalar callus, and scutellum concolorous with thoracic dorsum; outer prosternum yellowish, inner part dark brown, with rather long black hairs; propleuron dark brown, silvery-gray pollinose, with metallic greenish tinge, covered with brown hairs; supraspiracular convexity brownish pubescent, without long upstanding hairs; hypopleural with row of long black bristles; other pleural hairs black; mesothoracic spiracle dark brown; metathoracic spiracle dark brown; postalar declivity fuscous black, with black hairs; tympanic tuft absent; anterior parasquamal tuft absent.

Chaetotaxy: ac 3+4-5; dc 3+4; ia 1+2-4, sometimes 2 weaker postsutural ia present; h 4-5; ph 3; prs 1; prealar 1; sa 2; pa 2; st 2+1; msc 3-4; dsc 2-4; n 2; pp 2; pst 1-3.

Wings: Dark brown infuscate, most strongly brown along veins, paler in cells and to hind margin; veins dark brown; epaulet black, with black setulae and bristles; basi costa black, with brown pubescence; subcostal sclerite dark brown; node of R2+3 and R4+5 veins with several black setulae extending to R4+5 above and below; vein M1+2 forming right angle; Cell R5 open at wing margin; section of vein M1+2 from bend to wing margin slightly curved inward; alar squama whitish, with pale yellow edge and white fringe; thoracic squama whitish, bare on dorsal surface, with dark brown edge and dark brown fringe. Halter fuscous, darkened on apex.

Legs: Femora dark brown to blackish, with metallic violet tinge; tibiae brown; tarsi dark brown; coxa dark brown to blackish, covered with black hairs and bristles anteriorly; fore tibia with row of several strong ad, 3 short pd, 2-3 strong p; mid tibia with row of several strong ad, several short pd, 2-3 strong p, 1 strong av; hind tibia with 2 av, row of several strong ad, 4 long pd.

Abdomen: Metallic bluish-green to blue, with somewhat purplish tinge, slightly silvery-gray pollinose; hairs and bristles black; T1+2 with 1 lateral marginal bristle; T3 with lateral and 1 pair of strong median mb, sometimes with 1 or a pair of median discal bristles weakly developed; T4-T5 with row of mb; sternites dark brown with metallic violet tinge, covered with black bristles and hairs. Fifth sternite with long and wide lobes, longer than basal part, as shown in Fig. 10C.

Hypopygium not prominent; genitalia as shown in Fig. 10A, B, D, E, F, paraphallus stout, strongly ossified; hypophallus and acrophallus stout.

Female. Head: Eyes dichoptic; frons index 0.54; frontal stripe yellow to yellowish-orange, broad, about 2.8 times as wide as one parafrontal, black setulose laterally; parafrontal yellow, silvery-yellow pollinose, broader than that of male, with about 9 pairs of ori, reclinate ors 1, proclinate ors 2; parafacial yellow, silvery-yellow pollinose, bare, broader than that of male, about 3 times as broad as width of AS3; ors 2+1; ocellar bristle (oc) 1; postocellar bristles (pooc) 3-4; ov 1; inner vertical bristle (iv) 1; postoccipital bristle (poc) 1; occipital bristle (occ) 1.

Legs: Fore tibia with row of several strong ad, 4 pd, 2 strong p; mid tibia with row of several strong ad, 3 pd, 2 strong p, 1 strong av; hind tibia with 2 av, row of several strong ad, 4 long pd. Otherwise same as for male.

Length: 12.0-17.0 mm.

Diagnosis.

The specimens of this species collected in Taiwan are slightly different in external morphology from those collected in China. Taiwanese specimens are more bluish when compared to the greener Chinese individuals, and the shape of the ST5 is different (Fig. 11) (A, Silbomyia sauteri ; B, Silbomyia hoeneana , collected in Taiwan; C, Silbomyia hoeneana , collected in China), the lobes of the ST5 of Silbomyia hoeneana collected in Taiwan are longer than the basal part, while those of Silbomyia hoeneana collected in China are almost equal to the basal part.

Bionomics.

Adults are frequent flower visitors.

Distribution.

Taiwan and Southern China (Jiangsu Province, Zhejiang Province, Sichuan Province, Jiangxi Province, Hainan Province, Guangdong Province, Yunnan Province).