Sciasmomyia

Shi, Li, Gaimari, Stephen D. & Yang, Ding, 2013, Revision of Sciasmomyia Hendel (Diptera: Lauxaniidae), with eight new species, Zootaxa 3691 (4), pp. 401-435 : 417-418

Sciasmomyia lui sp. nov.

( Figs 50–57 )

Diagnosis. Face with brown median stripe and pair of brown Y-shaped lateral stripes. Mesonotum with two grayish median stripes, blackish brown between dc rows on posterior 1/3; anepisternum entirely grayish black; katepisternum grayish black except for a yellow triangular area close to anterior margin. Wing with series of constricted longitudinal spots along R2+3, with pairs of spots (one above and one below vein) between them; R4+5 with a hyaline annular apical spot. Abdomen brown with grayish white pruinosity, with a pair of yellow band-like lateral spots on tergite 6. Male with syntergosternite 7+8 narrow, U-shaped, separated from epandrium; epandrium bilobed distally; hypandrium with hypandrial apodeme longer than lateral arms, apically conjoined with a quadrate sclerite and a furcated apical process at middle of quadrate sclerite; phallus with pair of small blunt basal processes, a U-shaped sclerite with pair of acuate processes on upper margin, and pair of acuate dorsal processes in ventral view.

Description. MALE. Body length 5.2 mm, wing length 6.2 mm. FEMALE. Unknown.

Head ( Fig. 51 ) yellow. Frons with two wide brown stripes extending to vertex; ocellar triangle grayish black; oc strong, longer than anterior or. Face with brown median stripe on upper 2/3 and pair of brown Y-shaped lateral stripes confluent with two oblique lateral stripes along inner margin of parafacial, pair of larger brown spots at ventral corner and wide blackish brown stripe on ventral margin; parafacial yellow except for inner margin black, with a brown elliptical spot at ventral corner. Gena about 2/3 height of eye, with large brown spot. Antenna yellow, 1st flagellomere 1.3 times longer than high; arista with longest setula about 1/5 height of 1st flagellomere. Proboscis pale brown. Palpus pale brown.

Thorax ( Fig. 52 ) brownish yellow. Mesonotum with two grayish median stripes, grayish brown area between dc rows on posterior 1/3; anepisternum entirely grayish black; katepisternum grayish black except for a yellow triangular area close to anterior margin. Legs mostly yellow, fore femur pale brown on posteroventral surface, hind femur pale brown on basal 3/4 of dorsal surface; all basitarsi with a basal and apical ring, tarsomere 2 brown on apical 1/2 and tarsomeres 3–5 entirely brown. Fore femur with 5 pv and 8 pd, mid femur with 4 weak a. Wing ( Fig. 53 ) pale brown with small hyaline spots, all of which display white or lighter brown on that part of the vein; subcostal cell with brown spot; series of widely spaced medially constricted hyaline spots along costal margin extending through R2+3; between these hyaline spots along R2+3 are pairs of hyaline spots, one above and one below vein; R4+5 with series of irregular spots and hyaline annular apical spot; CuA1 with series of rectangular spots constricted at middle; crossvein r-m pale brown, with hyaline spots on all four sides surrounding; hyaline spot in cell r4+5 above dorsal tip of crossvein dm-cu; costa with 2nd (between R1 and R2+3), 3rd (between R2+3 and R4+5) and 4th (between R4+5 and M1) sections in proportion of 7.4:1.4:1; ultimate and penultimate sections of M 1 in proportion of 1:1.4; ultimate section of CuA1 about 1/7 of penultimate. Halter pale yellow.

Male abdomen brown with grayish white pruinosity, and tergite 6 with pair of yellow band-like lateral spots. Male genitalia ( Figs 54–57 ): syntergosternite 7+8 semicircular, weakly sclerotized, separated from epandrium; epandrium slender with pair of dorsal setae, rounded apically with tiny incision, and several long yellowish setulae in lateral view; surstylus consisting of pair of elliptical sclerites with setulae in lateral view; hypandrium with hypandrial apodeme longer than lateral arms, apically conjoined with a quadrate sclerite and a furcated apical process at middle of quadrate sclerite; phallus consisting of a pair of small blunt basal processes, a U-shaped sclerite with a pair of acuate processes on upper margin, a pair of acuate dorsal processes, and a deep incision at tip of membranous part in ventral view; phallapodeme (fused to phallus) long and narrow.

Type material. Holotype 3 (IZAS, IOZ1218980): CHINA, Sichuan Province: E’mei Mountain, Jiulaodong, 1800–1900 m, 18. VIII. 1957, Youcai Lu.

Distribution. China (Sichuan).

Remarks. The new species is only known from a singleton male, and can be differentiated from other species by the entirely grayish black anepisternum and mostly grayish black katepisternum, along with characteristics of the male genitalia.

Etymology. The new species is named after the collector Youcai Lu, in memory of his contribution to entomology in China.

Figures

FIGURES 50 – 53. Sciasmomyia lui sp. nov. Holotype male. 50. habitus, lateral view; 51. head, anterior view; 52. thorax, dorsal view; 53. wing.

FIGURES 54 – 57. Sciasmomyia lui sp. nov. Holotype male. 54. syntergosternite 7 + 8 and epandrial complex, lateral view; 55. syntergosternite 7 + 8 and epandrial complex, posterior view; 56. phallus complex, ventral view; 57. phallus complex, lateral view. Scale 0.1 mm.