Pachyscia dilatata ( Chen & He, 2004 )

Ho, George Wai-Chun, 2012, Notes on the genera Sinophasma Günther, 1940 and Pachyscia Redtenbacher, 1908 (Phasmatodea: Diapheromeridae: Necrosciinae), with the description of four new species from China, Zootaxa 3495, pp. 57-72 : 68-69

Pachyscia dilatata ( Chen & He, 2004)

( Figs. 17–18 )

Asceles dilatatus, Chen & He, 2004: 49 , fig. 5 a–c. Hennemann, Conle & Zhang, 2008: 19.

Chen & He, 2008: 117, figs. 82 a–c.

Type-material. Holotype Ƥ, 350–1400 m., Daqingshan, Guangxi Autonomous Region, China, 16.IX.1958, Fang Yiguang (ZSU), examined.

Other material examined. 33, 1Ƥ, Daqingshan, Guangxi Autonomous Region, China, 16.IX.1958, Fang Yiguang (ZSU).

Diagnosis. The male of this specie is similar to P. heishidingensis sp. nov. [Guangdong, China] but differs by olive brown colouration, small size, slimmer body, broadly emarginated mesonotum medially, shorter cerci and strongly dilated anal segment.

Description. Male ( Figs. 17–18 ). General colouration of body, legs, tegmina and costal region of alae olive brown. Body slender and slim.

Head: Chocolate brown. Genae with a yellow postocular band reaching back of head. Oblong, 1.5 x longer than wide. Smooth. Vertex slightly with a flattened elevation between the bases of antennae. Occiput flat. Eyes prominent and rounded, rufous brown. Antennae long, but not projecting over end of abdomen, some segments ringed; the first segment cylindrical, 1.5 x length of second segment.

Thorax: Olive brown, with a yellow oval spot at the posterior of mesopleurum. Granulated. Pronotum almost as long as head, anterior margin gently curved inward, and with two mini granules, transverse and longitudinal sulcus crossing before middle. Mesonotum broadly emarginated medially, posterior margin about 1.5 x wider than anterior margin, sparsely covered with small granules, median carina distinct. Mesopleurum and mesosternum with very few granules. Metapleurum smooth, with a yellow spot.

Abdomen: Brown, with short setae. Very slender. Second to fifth tergites equal in length. Parallel-sided from second to sixth tergites. Seventh tergum expanded posteriorly after middle. Ninth tergum as long as eighth tergum, with a white spot near the posterior. Anal segment elongate, almost 4 x length of ninth tergum, hind margin with deep triangular emargination, median carina distinct; broad at base, constricted medially, broadened in second half and strongly dilated into a rounded lobe postero-laterally, hind margin of the lobes truncate. Poculum cup-shape, hind margin rounded. Cerci cylindrical, short and straight, broad at base, tapering posteriorly, not projecting over the end of poculum, with lightly furcate apices.

Legs: Brown to olive brown, all femora and tibiae with dark tip. The base of all tibiae yellow. All tarsi light brown. Lacking distinct armature. With long bristles. Medio-ventral carina of metafemora slightly with a flattened lobe at base. Profemora as long as protibiae, curved at base. Mesotibiae as long as mesonotum. Wings: Tegmina chocolate brown, short and oval, truncate at hind margin, with a yellow spot at base and another yellow spot near the hind margin. Alae brown, reaching sixth tergum, with a yellow spot and a broad yellow stripe near the base of the costal region.

Measurements in table 4.

Notes. A full measurement of the holotype female is given ( Table 4 ). Detailed description of the female was provided by Chen and He (2008: 117). The male is described for the first time.

Distribution. Guangxi (Daqingshan), China.

Figures

FIGURES 17 – 20. Pachyscia spp. [scale bar 5 mm]. 17. P. dilatata (Chen & He, 2004), male, apex of abdomen, dorsal view. 18. P. dilatata (Chen & He, 2004), male, apex of abdomen, lateral view. 19. P. heishidingensis Ho sp. nov., male, apex of abdomen, dorsal view. 20. P. heishidingensis Ho sp. nov., male, apex of abdomen, lateral view.

Tables

TABLE 4. Measurements of Pachyscia dilatata (Chen & He, 2004)

Lengths (mm)	Female (HT)	Male
Body	87	67
Head	6	3
Antennae	70	70
Pronotum	5	3
Mesonotum	16	12
Metanotum including median segment	11	8
Profemora	22	20
Mesofemora	13	13
Metafemora	20	20
Protibiae	22	20
Mesotibiae	14	12
Metatibiae	20	18
Tegmina	6	3
Alae	40	34