Helina subnigriabdomilis Xue and Sun, 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 : 1578-1580

Helina subnigriabdomilis Xue and Sun , sp. nov.

( Figure 10A–D )

Type material

Holotype. One male ( IESNU), China, Snow Mount Meili , Yunnan Province, 28° 30' N, 98°39' E, altitude 2900 m, 31 May 2013, X. Zhang

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

Etymology

The specific name is based on the similarity of the new species to H. nigriabdomilis Xue and Wang.

Distribution

China, Yunnan Province, Snow Mount Meili.

Remarks

This new species is similar to H. nigriabdomilis Xue and Wang , but differs from it as follows. Frons narrower than postpedicel in width, about 1.2–1.5 times as broad as anterior ocellus; 5–6 pairs of fr on lower two-fifths of frons; ocellar seta strong, about five-sixths length of lower fr; fronto-orbital plate and parafacial with brown pruinosity; arista long plumose, most of hairs about 1.2 times as long as antenna width; genal height about three-quarters of eye height; labella shorter than four-fifths length of prementum; prst acr 8–10 rows; ventral lateral margin of scutellum with black hairs; subcostal sclerite with orange hairs; margin of calypter yellow; dm-cu not distinctly clouded; haltere yellow. Fore tibia without p and pv; mid tibia with 6 pectinate p, about 2.2 times as long as the diameter of mid tibia; hind femur with 9–10 av in apical three-quarters; hind tibia with 9–10 av in basal two-thirds, shorter towards apex, 6–7 ad in apical three-fifths, about 2.5-2.7 times as long as the diameter of hind tibia; tarsi distinctly longer than tibiae; tergite 2 not black, middle part with black vitta; tergites 3–5 with distinct shifting patches; sternite 1 bare; lateral lobe of sternite 5 narrower; distal of cercus broader than basal, outer protuberance distinctly intumescent.

Description (based on holotype)

Male. Body length 8.0– 8.4 mm.

Head. Eyes with dense, long and orange hairs; frons narrower than postpedicel in width, about 1.2–1.5 times as broad as anterior ocellus; frontal vitta black; 5–6 pairs of fr on lower two-fifths of frons, without ors; ocellar seta strong, about five-sixths length of lower fr; fronto-orbital plate and parafacial with brown pruinosity; middle part of parafacial subequal to antenna width; antenna black, postpedicel thin and long, length about 3.8–4.0 times as long as median width; arista long plumose, most of hairs about 1.2 times as long as antenna width, upper more than lower; lunule dark brown; epistoma not protruding; vibrissal angle situated behind frontal angle; anterior margin of gena with 2 rows of upcurved setulae, genal and postgena setulae black; gena with dark grey pruinosity; genal height about three-quarters of eye height; occiput with dark grey pruinosity; epicephalon with black hairs; prementum with dense and dark grey pruinosity, length about 2.2 times as long as height; labella larger, posterior part extended in upward direction, shorter than four-fifths length of prementum; palpus black, about 1.2 times as long as prementum;

Thorax. Ground-colour black; pleura with dark grey pruinosity; scutum with dense and orange grey pruinosity and 4 dark black pruinose vittae, inner vitta reaching the posterior of postsutural area of scutum; prst acr 8–10 rows, only a pair of acr strong near scutoscutellar suture; dc 2+4, ial 0+2, pra long and setiform, about three-fifths length of posterior notopleural seta, postpronotal setae 3, posthumeral seta 1+0; posterior notopleural seta with hairs around base; basal and apical scutellar setae strong, lateral scutellar setae 2 pairs, lateral surface and ventral lateral margin of scutellum with black hairs; basisternum of prosternum, proepisternum hollow in centre, anepimeron and katepimeron all bare, meron with thin hairs; anterior anepisernal seta 1; anepisternal setae without hairs between the first and the second, among the other setae with thin hairs; katepisternal setae 2+2; anterior and posterior spiracles larger and dark brown; anatergite with orange black hairs; greater ampulla bare.

Wing. With a brownish colour, basicosta yellow, subcostal sclerite with orange hairs; costal spine short, Sc bow-shaped, radial node bare, R 4+5 and M straight, diverging in distal part; cross-vein r-m distinctly clouded; calypters light orange, lower calypter tongue-shaped protruding, margin of calypter yellow, haltere yellow.

Legs. Completely black; fore tibia without p and pv; mid femur av indistinct, with pv row complete, shorter towards apex, 6–7 strong in basal half; mid tibia without ad, pectinate p 6, about 2.2 times as long as the diameter of mid tibia; hind femur with 9–10 av in apical three-quarters, without pv; hind tibia with 9–10 av in basal two-thirds, shorter towards apex, most of setae about 2.5–2.7 times as long as the diameter of hind tibia, median long ad row (about 7) in apical three-fifths, about 2.5–2.7 times as long as the diameter of hind tibia, without pd, 8–9 pv in basal twothirds, shorter towards apex, 1 d in pre-apical part, without pv in apical part; tarsi distinctly longer than tibiae, claws and pulvilli of fore leg about 1.5 times as long as the tarsomere 5, claws and pulvilli of middle and hind legs about 1.2 times as long as the tarsomere 5.

Abdomen. Ground-colour black, with greyish pruinosity; oval in dorsal view; tergite 2 grey, tergites 2–5 with median, narrow and black vitta; tergites 3–5 each with a pair of black patches and shifting patches, lateral patches on tergite 5 smaller, outline indistinct; discal setae 2 rows; body hairs of tergite 2 denser, body hairs of each posterior tergite gradually sparse; posterior marginal setae of middle part of tergite 2 shorten; sternite 1 bare; posterior marginal setae of sternites 2–4 longer; lateral lobe of sternite 5 narrower; distal of cercus broader than basal, outer protuberance distinctly intumescent.

Female. Unknown.

Figures

Figure 10. Helina subnigriabdomilis Xue and Sun, 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–D, 0.5 mm.