Idricerus decrepitus (Walker, 1859)

Zhang, Jie, Sun, Mingxia & Wang, Xinli, 2015, Synopsis of subfamily Haplogleniinae Newman, 1853 in China (Neuroptera: Ascalaphidae), Zootaxa 3941 (3), pp. 375-390 : 376-378

Idricerus decrepitus (Walker, 1859)

( Figs. 1–6 )

Ascalaphus decrepitus Walker, 1860: 197 .

Idricerus decrepitus McLachlan, 1871: 240 .

Diagnosis. Forewing axillary angle projecting, CuA2 short, about equal with one crossvein. Wings densely covered yellowish brown speckles along veins, stigma dark brown.

Measurements. Male: body length 28–30 mm, abdomen length 16–17 mm, antenna length 24–26 mm, forewing 32–35 mm, hind wing 28–31 mm. Female: body length 27–28 mm, abdomen length 15–16 mm, antenna length 25–26 mm, forewing 38 mm, hind wing 33–34 mm.

Head. Wider than thorax. Vertex light brown, with white and grey long hairs Frons red-brown. Genae with white long hairs. Clypeus and labrum yellow. Mandible apex dark-brown. Maxillary palpus and labial palpus yellow. Eyes grayish yellow with dense dark color spots and stripes, entire, no transverse furrow. Antennae alternating between pale yellow and brown, terminal pyriform.

Thorax. Pronotum black, anterior and posterior margin yellow. Mesonotum and metanotum black. Pleuron with long grey setae.

Wings. Forewing narrow and elongate, basal area with distinct axillary angle, the distal margin of axillary angle concave. Veins alternating between pale and dark, wings mottled. Pterostigma dark brown, with 3–4 crossveins, apical area with 2 rows of cells, Cubital area with 4–5 rows of cells in the longest central across row. Hind wing narrow and elongated, slightly shorter than the forewing, apical area with 2 rows of cells, CuA2 short, equal about one crossvein.

Legs. Bright black, with long, white and black bristles. Femora and tibia proximally and distally yellow, spurs and claws reddish-brown. Tibial spur reaching to end of 2nd tarsomere.

Abdomen. Shorter than hind wing. Tergite black, some parts light color; sternite black, some specimens with white part, and sparse white long hairs.

Terminalia and Genitalia. Male ( Figs. 2–3 ). Ectoprocts oval; gonarcus wide vaulted; parameres thin and positioned near distal margin, broad and divergent basally; pelta present; pulvini broad, with setae. Fmale ( Figs. 5–6 ). Ventrovalvae blade-shaped, with interdens; linguella small distivalvae nearly oval.

Material examined. 1 ♂, China, Tibet Zhangmu port, 8. VI. 1981, Shenglv Hu, CAUN 200362. 1 ♂, Tibet Zhangmu Friendship Bridge, 17. IV. 1981, Shenglv Hu, CAUN 200363. 1 ♀ 1 ♂, Tibet Jilong, 20. VI. 1984, Zhaoxing Yan, CAUN 200360, CAUN 200365; 1 ♀, Tibet Jilong, 22. VI. 1984, Zhaoxing Yan, CAUN 200366; 1 ♂, Tibet Jilong, 28. VI. 1984, Zhaoxing Yan, CAUN 200361; 1 ♂, Tibet Jilong, 25. VI. 1984, Qiong Pu, CAUN 200364.

Distribution. China: Tibet; North India, Turkmenistan, Nepal, Pakistan, Kashmir.

Figures

FIGURES 1 – 6. Idricerus decrepitus. 1. Male, dorsal view. 2. Male genitalia, lateral view. 3. Male genitalia, ventral view. 4. Female, dorsal view 5. Female terminalia, lateral view. 6. Female terminalia, ventral view. Abbreviations: ep = ectoprocts; ga = gonarcus; pa = parameres; plt = pelta; pv = pulvini; dv = distivalvae; id = interdens; lg = linguella; vv = ventrovalvae.