Pachyprotasis coximaculata 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 : 5

Pachyprotasis coximaculata Zhong & Wei , sp. nov.

( Figs. 6, 7 , 40 , 56 , 74 , 91, 105, 127)

Distribution. China (Gansu, Shanghai and Shaanxi) ( Fig. 127 ).

Material examined. Holotype, Shanghai: ♀, Shanghai (31°13′N, 121°28′E), 11.04.1953 ( CSCS); paratypes, Gansu: 1 ♀, Nanguosi, Qinzhou (34°34′N, 105°44′E), 29.04.2005, Yinglong Chen leg.; Shaanxi: 4 ♀, Daguping, Foping (33°55′N, 108°00′E, alt. 1320 m), 28.04.2006, Xun Zhu, Mojun He leg.

Etymology. The specific epithet, refers to the white spot on the outer part of the hind coxa. It is an adjective.

Female ( Figs. 6, 7 ): Body length 9.0 mm. Body black, with white pattern as follows: lateral labrum, narrow stripe on inner orbit connected to small spot on temple, extreme narrow posterolateral margin of pronotum, anterior margin of tegula, a medial small spot laterally on median mesoscutal lobe, mesoscutellum except laterally, middle of mesoscutellar appendage, metascutellum, middle of posterior margin of terga 3–6; labrum dark brown; legs black, with white pattern as follows: fore leg from apex of femur to claw ventrally, middle tibia ventrally, an outer spot on base of hind coxa, hind trochanter and extreme base of femur. Wings pale brown, stigma and veins black.

Labrum and clypeus with sparse, shallow and minute punctures; punctures on vertex, frons and mesoscutum dense, minute, space between punctures with dense sculpture, slightly shiny; punctures on upper mesepisternum dense, large, rough and irregular, on lower dense, minute and regular, posterior margin of mesepimeron with minute punctures, sculpture distinct, luster nearly absent; punctures on metepisternum dense, minute, luster absent, punctures on metepimeron sparse, slightly shiny ( Fig. 74 ); middle of mesoscutellum smooth, punctures nearly absent, laterally with shallow and quite large punctures, space between punctures smooth, shiny, mesoscutellar appendage with dense sculpture and luster; punctures on medial terga nearly absent, laterally with sparse, shallow punctures and dense sculpture, shiny; outer hind coxa with shallow and quite dense punctures.

Anterior margin of labrum truncate, medially with a shallow notch; clypeus truncately incised to about 1/3 of its medial length, lateral lobe blunt and broad; malar space broader than diameter of median ocellus; inner margins of eyes slightly convergent downwards; supra-antennal tubercle indistinct; frontal area distinctly elevated, as high as top of eye in lateral view, frontal ridge indistinct; median fovea indistinct, lateral fovea shallow ( Fig. 40 ); interocellar and postocellar furrow shallow; postocellar area indistinctly elevated, 2 times as broad as long, lateral postocellar furrows shallow and slightly divergent posterior; head distinctly narrowed behind eyes in dorsal view ( Fig. 56 ). Antenna shorter than combined length of thorax and abdomen, flagellomere 1 as long as flagellomere 2, some apical flagellomeres compressed. Mesoscutellum elevated, lateral carina sharp, mesoscutellar appendage with blunt middle carina. Hind tarsomere 1 as long as combined length of following 4 tarsomeres. Fore wing with middle petiole of anal cell quite short, about 1/4 length of basal part of anal cell, 3/4 as long as vein R+M; petiole of hind wing anal cell as long as 1/ 2 vein cu-a.

Lancet with 19 serrulae (Fig. 91), base of each serrula distinctly elevated, middle serrula each with 2 basal denticles and 3–6 indistinct distal denticles (Fig. 105).

Male. Unknown.

Discussion. This species is similar to P. maculoscutellata and can be distinguished as follows ( P. maculoscutellata in parentheses): punctures on mesepisternum rough, their diameter and depth irregular, distance between them also irregular (punctures on mesepisternum not rough, their diameter and depth regular, distances between them also regular); labrum and clypeus dark brown (labrum and clypeus completely white); median mesoscutal lobe laterally with a medial white spot (median mesoscutal lobe completely black). It is also similar to P. maculopediba and may be distinguished by ( P. maculopediba in parentheses): punctures on mesepisternum rough, their diameter and depth irregular, distance between them also irregular (punctures on mesepisternum not rough, their diameter and depth regular, distances between them also regular); median mesoscutal lobe laterally with a medial white spot (median mesoscutal lobe completely black); mesepisternum completely black (medial of mesepisternum posterior with white spot); hind coxa black, outer with a basal white spot (hind coxa completely black); hind femur black, only extreme base of femur white (basal 1/3 of hind femur white); base of each serrula distinctly elevated (base of each serrula not distinctly elevated). Except for the punctures on mesepisternum and serrulae, reliable morphological differences between these three species were not found.

Figures

FIGURE 127. Geographical distribution of species of P. melanosom a group in China (3).

FIGURES 6 – 9. Dorsal and lateral view: 6 – 7. P. coximaculata, female, holotype; 8 – 9. P. coxipunctata, female, holotype.

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 72 – 75. Thorax in lateral view: 72. P. chenghanhuai, female; 73. P. cinctulata, female; 74. P. coximaculata, female; 75. P. coxipunctata, female.