Megadiestramima (Megadiestramima) abramovi, Gorochov & Storozhenko, 2019

Megadiestramima (Megadiestramima) abramovi View in CoL sp. nov.

( Figs 11–14, 47)

Holotype. Male, Northern Vietnam, Hai Phong

Prov., Cat Ba I. in Tonkin Bay, Cat Ba National Park,

~ 10 km NW of Cat Ba City , 20°47'56''N, 106°59'47''E, X.2011, A. Abramov ( ZIN) GoogleMaps .

Paratypes. One male, 1 female, same data as for holotype ( ZIN) ; 1 male, 3 females, same island and park, but IX.2008, S. Rjabov, N. Orlov ( ZIN) .

Description. Male (holotype). General appearance similar to that of M. (M.) intermedia and M. (M.) borealis . Colouration as in holotype of latter species, but base of rostral tubercles brown, mesonotum with small light brown marks along its anterolateral edges, light brown areas on lateral parts of eight subsequent tergites rather small, dorsal surface of hind femur almost not darkened, and poorly distinct darkish spots and areas on rest parts of legs undeveloped (but femoral apical parts darkened almost as in this specimen). External structure of body also similar to that of M. (M.) borealis ; however, armament of tibiae and of hind basitarsus slightly different [d2a, v~2 (v2), v~2, v3a / d2a, v~2, v2, v3a / d40-33i, d2sa, 6a / d2c, dac], inner dorsal spur of hind tibia barely not reaching apex of dac, posteromedian lobe of sixth abdominal tergite with very small apical notch ( Fig. 11), and posteromedian process of seven abdominal tergite as well as paraproct similar to those of M. (M.) intermedia but with ventroapical process of paraproct distinctly shorter (space from cercal base to apex of paraproct about 1.5 times as long as this process; vs. this ratio almost equal to two; Fig. 12). Genitalia with median sclerite clearly Y-shaped, but its distal (unpaired) part shorter than a pair of its proximal parts ( Fig. 47).

Variations. Sometimes body with lightish stripe running along dorsomedial edge of each eye and behind it, with light brown spots on pronotum near its ventral edges, and with dorsal area on proximal half of hind femur barely darkened; armament of legs very weakly variable.

Female. Colouration and structure of body similar to those of males, but darkened apical portions of femora longer, poorly distinct darkish spots and area on rest parts of legs developed, and tergites and paraprocts as in female of M. (M.) borealis (however, sixth abdominal tergite with very small posteromedian notch similar to that of males). Genital plate ( Fig. 14) and ovipositor practically indistinguishable from those of female of M. (M.) borealis .

Length in mm. Body: male 23–26, female 22–27; pronotum: male 8.5–9, female 9–9.5; fore femur: male 17.5–18.5, female 18–19; hind femur: male 34–38, female 37–39; hind tibia: male 38– 44, female 41–46; hind basitarsus: male 7–7.5, female 7.4–7.8; ovipositor 18.3–18.8.

Comparison. The new species is most similar to M. (M.) extensa in the structure of male genitalia. It also may be only a subspecies of the latter species, and its differences from all the other congeners are given in the key above.

Etymology. This species is named after A.V. Abramov, a well-known researcher of Vietnamese mammals who collected these interesting insects.