Parastratiosphecomyia rozkosnyi Woodley

Woodley, Norman E., 2012, Revision of the southeast Asian soldier-fly genus Parastratiosphecomyia Brunetti, 1923 (Diptera, Stratiomyidae, Pachygastrinae), ZooKeys 238, pp. 1-21 : 10-12

Parastratiosphecomyia rozkosnyi Woodley sp. n. Figs 5, 8, 21-25

Diagnosis.

Parastratiosphecomyia rozkosnyi can be distinguished from Parastratiosphecomyia stratiosphecomyioides and Parastratiosphecomyia freidbergi by having the lateral surface of the hind coxa with some dark coloration. This can be small in extent but is always visible. It differs from Parastratiosphecomyia szechuanensis (as well as the other species) by its distinctive male genitalia in which the gonostylus possesses two subequal tooth-like processes (Fig. 22). Females are very similar to those of Parastratiosphecomyia szechuanensis but differ by having the juncture of the posterior and lateral margins of tergite 8 evenly rounded.

Description.

Differs from Parastratiosphecomyia stratiosphecomyioides as follows: Male.Head: Lower frons with dark spots larger and more distinct; face with a pair of irregularly ovoid blackish spots below antennal bases, medial part not convex and only vaguely impressed medially, concave on lowest part between conical processes, medial portion shiny and weakly to indistinctly striate, process on lower, outer margin of antennal socket minute, sometimes not developed; pilosity on dark portion of lower face dark; antennal scape more evenly pilose, sometimes darkened narrowly at base, slightly swollen, not produced ventrally, and concave area at inner base distinct but smaller.

Thorax: Scutum with lateral yellowish spots near transverse suture much smaller, not easily seen with naked eye, narrow ovoid; scutellum black with broad yellow posterior margin, the yellow coloration about one-fourth to one-third length of scutellum; scutum with hair-like setae entirely pale, golden yellow, with much of scutum also with scattered, more erect pale hair-like setae in addition to semi-appressed pilosity; hind coxa with some lateral darkened areas, sometimes extensive, the coloration somewhat diffuse rather than forming distinct markings; front femur brownish black on about basal one-third, this area sometimes yellowish dorsally, also a moderately well-defined brownish area ventrally near apex; middle femur coloration similar to front femur except that dark coloration at base occupies about half of the femur; hind f emur brownish black becoming narrowly yellowish at apex; hind tibia brownish black, vaguely yellowish at extreme apex; tarsi with fifth tarsomeres brownish dorsally; wing with apical infuscation somewhat darker, the infuscation extending nearly to the wing apex, darkest area includes part of cell r2+3, all of r4, and basal three-fourths of r5.

Abdomen: Tergite 1 brownish black with broad pale yellow margins both anteriorly and posteriorly, yellowish medially except for narrow band near base; tergite 2 yellowish medially, this coloration extending indistinctly on basal part of tergite 3.

Terminalia: Gonocoxites (Fig. 21) with lateral margins rounded, with a pair of posterodorsal processes that are rounded posteriorly, concave laterally; gonocoxal apodemes very small, ending far posterior of anterior margin of genital capsule; posterior margin of synsternite with narrow medial process that is rounded posteriorly; gonostylus (Figs 21, 22) arcuate, divided into a pair of sharp, subequal teeth; phallic complex (Figs 23, 24) small, narrow, trilobed, medial lobe subequal to lateral lobes in length; epandrium (Fig. 25) large, evenly convex, posterior margin with rounded medial projection; epiproct and hypoproct deflexed ventrally, hypoproct strongly sclerotized, not expanded dorsolaterally, with narrow anteromedial process that is slightly bent ventrally.

Length: 12.0-13.2 mm.

Female. Differs from male as follows: Head: Frons 0.25-0.27 head width, upper frons with slightly raised medial strip that is about one-fourth of head width and widens slightly toward antennae; dark spots above antennae small, sometimes indistinct; junction of upper and lower frons flat, face slightly concave medially; upper frons with pale, appressed hair-like setae.

Thorax: Scutum with erect hair-like setae slightly shorter than in male; hind tibia mostly brownish in specimens examined.

Abdomen: Sternite 8 with lateral margins extending dorsally toward posterior end, forming evenly rounded angle with posterior margin that does not overlap sides of terminalia.

Length: 10.3-10.4 mm.

Distribution.

Known from Laos and northern Thailand.

Type material.

Holotype male (Fig. 5; MMB), LAOS: Louang Namtha Province, Namtha to Muang Sing, 21°09'N, 101°19'E, 900-1200 m, 5-31.v.1997, Vít Kubán. Paratypes: 2 males, 1 female, same data as holotype; 1 male (MMB), LAOS: Oudomaxi Province, 17 km NEE of Oudom Xai, 20°45'N, 102°09'E, ca. 1100 m, 1-9.v.2002, Vít Kubán; 1 male (ZIB), LAOS: (central), environs of Ban Phabat, 70 km NE of Vientiane, 18°16.1'N, 103°10.9'E, 150 m, 27. iv– 1.v.1997, E. Jendek, O. Sauša; 1 male, 1 female (SMF), THAILAND: (north), Mae Hong Son Province, Phangmapha, near Ban Nam Rin, 11.v.2011, D. Kovac, sweeping along small stream.

Etymology.

The species epithet, rozkosnyi, is a patronym in honor of Rudolf Rozkošný of Brno, Czech Republic, who has produced many excellent contributions to the knowledge of Stratiomyidae over a distinguished and continuing career.

Remarks.

Parastratiosphecomyia rozkosnyi is very similar to Parastratiosphecomyia szechuanensis in coloration and general structure. The main distinguishing features are the very different male terminalia and slightly different sternite 8 in the female.