Pachyprotasis hengshani Zhong & Wei

Zhong, Yihai, Li, Zejian & Wei, Meicai, 2015, Six new Chinese species of the Pachyprotasis melanosoma group (Hymenoptera: Tenthredinidae) with a key to the species, Zootaxa 3914 (1), pp. 1-45 : 7-8

Pachyprotasis hengshani Zhong & Wei , sp. nov.

( Figs. 10, 11, 12, 13 , 42, 43 , 58, 59 , 76, 77 , 93, 107, 118, 122, 126)

Distribution. China (Hunan) ( Fig. 126 ).

Material examined. Holotype, Hunan: ♀, Mt. Hengshan (27°25′N, 112°86′E, 100 m), 0 2.04.2005, Yingke He leg. ( CSCS); Paratype: 1 ♂, Mt. Hengshan (27°25′N, 112°86′E, 1200 m), 0 2.04.2005, Yingke He leg.

Etymology. The specific epithet refers to the type locality, Hengshan.

Female ( Figs. 10, 11 ): Body length 9.5 mm. Body black, with white pattern as follows: labrum except a medial large spot, a narrow stripe on upper part of inner orbit connected to an oblique spot on temple, a narrow stripe on hind orbit connected to malar space, posterior margin of pronotum, basal half of tegula, mesoscutal lobe with lateral part anteriorly and spot on apex, a small spot on middle of lateral mesoscutal lobe, medial mesoscutellum, medial mesoscutellar appendage, metascutellum, posterior margin of mesepimeron, posterior margin of metepimeron, a triangular spot on posterior of each tergum, a round spot around each spiracle, posterolateral margin of each tergum, posterior margin of each sternum; legs black, with white pattern as follows: fore femur posteroventrally, underside of fore and middle tibiae and tarsi, inner of hind trochanter, basal 2/5 of hind femur. Wings pale gray, base of vein R1 of fore wing pale brown, stigma and other veins dark brown.

Labrum and clypeus with sparse, shallow punctures; punctures on vertex and frons shallow, minute, not dense, sculpture dense, shiny; mesoscutum with dense punctures, shiny; punctures on upper mesepisternum sparse, shallow and large, on lower mesepisternum dense, minute, space between punctures with dense sculpture and distinct luster; anepimeron with distinct sculpture, luster absent, katepimeron smooth, distinctly shiny; metepisternum with dense, shallow and minute punctures, luster absent, punctures on metepimeron indistinct, sculpture faint, distinctly shiny ( Fig. 76 ); middle of mesoscutellum smooth, punctures absent, laterally with quite deep punctures, strongly shiny; mesoscutellar appendage smooth, punctures nearly absent, strongly shiny; terga with sparse, shallow and minute punctures, space between punctures with distinct sculpture and luster; punctures on outer hind coxa quite minute.

Anterior margin of labrum truncate; clypeus truncately incised to about 2/5 of its medial length, lateral lobe blunt; malar space as long as diameter of median ocellus; inner margins of eyes convergent downwards; supraantennal tubercle indistinct; frontal area elevated, as high as top of eyes in lateral view; frontal ridge blunt; median fovea indistinct, lateral fovea shallow ( Fig. 42 ); interocellar furrow broad, deep, postocellar furrow absent; postocellar area elevated, 2 times as broad as long, lateral postocellar furrows deep, straight; head distinctly narrowed behind eyes in dorsal view ( Fig. 58 ). Antenna shorter than combined length of thorax and abdomen, flagellomere 1 slightly longer than flagellomere 2, some apical flagellomeres compressed. Mesoscutellum slightly elevated, lateral carina blunt, middle carina of mesoscutellar appendage indistinct. Hind tarsomere 1 distinctly shorter than combined length of following 4 tarsomeres, claw with inner tooth distinctly shorter than outer tooth. Fore wing with middle petiole of anal cell shorter than 1/3 length of basal part of anal cell, slightly shorter than length of of vein R+M; petiole of hind wing anal cell shorter than 1/2 length of vein cu-a.

Ovipositor sheath nearly 2 times as long as middle tarsomere 1 in lateral view, valvula 3 round at apex and 1.5 times as long as valvifer 2. Lancet with 20 serrulae (Fig. 93), base of each serrula elevated, middle serrula each with 1–2 basal denticles and 6–7 distal denticles (Fig. 107).

Male. Body length 8.0 mm ( Figs. 12, 13 , 43 , 59 , 77 ). Color and structure similar to female, otherwise: clypeus white, medially with a triangular black spot; spot on terga shorter and smaller than on female; hind femur dorsally with a narrow white stripe, on outer face with a narrow dark brown stripe on base; antenna pale brown ventrally; malar space 1.5 times as long as diameter of median ocellus; inner margins of eyes nearly parallel; flagellum strongly compressed; gonoforceps and penis valve as in Figs. 118, 122 .

Discussion. This species is similar to P. maculopediba a nd may be distinguished as follows ( P. maculopediba in parentheses): all terga posterior with distinct yellow-white triangular spot (all terga posterior without distinct yellow-white triangular spot, medially only with a narrow and short yellow-white stripe); mesepisternum completely black (lower mesepisternum posterior with white stripe). It is also similar to P. maculoscutellata , but may be distinguished by ( P. maculoscutellata in parentheses): median mesoscutal lobe with white spots (median mesoscutal lobe completely black); all terga posterior with a distinct yellow-white triangular spot (only terga 3–6 posterior each with a yellow-white medial triangular spot); outer part of hind coxa without white spot (outer part of hind coxa with a large white spot); basal 1/3 of hind femur white (only extreme base of hind femur white). Except for the serrulae, reliable morphological differences between these three species were not found.

Figures

FIGURE 126. Geographical distribution of species of P. melanosom a group in China (2).

FIGURES 10 – 13. Dorsal and lateral view: 10 – 11. P. hengshani, female, holotype; 12 – 13. P. hengshani, male, specimen from Hunan.

FIGURES 38 – 43. Face in front view: 38. P. chenghanhuai, female; 39. P. cinctulata, female; 40. P. coximaculata, female; 41. P. coxipunctata, female; 42. P. hengshani, female; 43. P. hengshani, male.

FIGURES 54 – 59. Head in dorsal view: 54. P. chenghanhuai, female; 55. P. cinctulata, female; 56. P. coximaculata, female; 57. P. coxipunctata, female; 58. P. hengshani, female; 59. P. hengshani, male.

FIGURES 76 – 79. Thorax in lateral view: 76. P. hengshani, female; 77. P. hengshani, male; 78. P. fulvocoxis, male; 79. P. maculopediba, female.

FIGURES 117 – 124 Gonoforceps and penis valve: 117. P. fulvocoxis, gonoforceps; 118. P. hengshani, gonoforceps; 119. P. maculopleurita, gonoforceps; 120. P. xibei, gonoforceps; 121. P. fulvocoxis, penis valve; 122. P. hengshani, penis valve; 123. P. maculopleurita, penis valve; 124. P. xibei, penis valve.