Helina midmargiseta Xue, 2014

Xue, Wanqi & Sun, Hongkui, 2014, Diagnosis and key for the Helina annosa-group (Diptera: Muscidae) from China, with descriptions of nine new species, Journal of Natural History 49 (25), pp. 1549-1583 : 1561-1563

Helina midmargiseta Xue sp. nov.

( Figure 4A–D )

Type material

Holotype. One male ( IESNU), China, Snow Mount Baimang , Yunnan Province, 28° 18' N, 98°58' E, altitude 4250 m, 26 July 2008, X.D. Fei.

Paratypes. One male ( IESNU), same data as holotype .

Etymology

The specific name is based on tergite 5 with a pair of median marginal setae.

Distribution

China, Yunnan Province, Snow Mount Baimang.

Remarks

This new species is similar to Helina setipostitibia Wang et al. 2004 , but differs from it as follows: frontal vitta about a half width of frons; parafacial about 1.2 times as broad as postpedicel; genal height slightly shorter than one-quarter of eye height; cross-veins r-m and dm-cu not distinctly clouded; fore tibia with 1 median p; mid tibia

only with 3 p, without ad and 2 rows of p; hind tibia with 4–5 av; abdomen oval in dorsal view, patches small.

Description (based on holotype)

Male. Body length 8.3–8.5 mm.

Head. Eyes with sparse ciliae; frons about 1.5–2.0 times as broad as anterior ocellus; interfrontal villi black, the narrowest of frontal vitta about a half width of frons; 6–7 pairs of fr on lower three-fifths of frons, without ors; ocellar seta strong, subequal to the lower fr in length; fronto-orbital plate and parafacial with grey white pruinosity; parafacial about 1.2 times as broad as postpedicel; antenna black, the length of postpedicel about 3.0 times as long as its width; arista long plumose, the longest hairs about 1.2 times as long as the width of postpedicel; lunule dark orange; epistoma not protruding; vibrissal angle situated behind frontal angle; anterior margin of gena with 1–2 rows of upcurved setae, genal and postgena setulae black; genal height slightly shorter than one-quarter of eye height; epicephalon with minority hairs; prementum with pruinosity, length about twice as long as height; palpus black, about 1.5 times as long as prementum; labella large, subequal to prementum length.

Thorax. Ground-colour black, with steel grey pruinosity; scutum with four black vittae, inner vitta reaching posterior three-quarters of postsutural area of scutum; acr 0+1, dc 2+4, ial 0+2, pra about one-half length of posterior notopleural seta, posthumeral seta 1+0; near posterior notopleural seta with many hairs; lateral and lower surfaces bare, basisternum of prosternum, proepisternum hollow in centre, anepimeron and katepimeron all bare, meron with many hairs; anterior anepisernal seta 1, katepisternal setae 1+2; spiracles large and brown.

Wing. With light orange colour, basicosta yellow; costal spine distinct, Sc bowshaped, radial node bare, R 4+5 and M straight, diverging in distal part, cross-veins r-m and dm-cu not distinctly clouded; calypters light orange yellowish, lower calypter protruding, haltere yellow.

Legs. Completely black; fore tibia with 1 median p; mid femur av indistinct, pv row complete, shorter towards apex; mid tibia with 3 p; hind femur with av row in apical half, without pv; hind tibia with 4–5 av, ad 2–3, witnout pd, middle part with posterior setulae row, without pv in apical part; tarsi longer than tibiae, claws and pulvilli equal length, about four-fifths of tarsomere 5 length.

Abdomen. Ground-colour black, with dense and greyish pruinosity; oval in dorsal view; tergites 3 and 4 each with a pair of small and black brown patches, margin of the patches slightly integrates with shifting patches; shifting patches on tergites 3–5 large, 2–3 pieces of shifting patches on tergite 5; tergites 2–5 each with 1 median and dark black vitta; tergite 3 with a pair of median marginal setae; posterior marginal setae of tergites 4 and 5 complete; discal setae 1 row; body hairs short and dense; tergite 6 bare; sternite 1 with many short hairs.

Female. Unknown.

Figures

Figure 4. Helina midmargiseta Xue, sp. nov. (A) Male, abdomen in dorsal view; (B) male, sternite 5 in ventral view; (C) male, cerci in posterior view; (D) male, terminalia in profile. Scale bars: A, 1 mm; B, 0.5 mm; C, D, 0.2 mm.