Lucretilis balikpapan Storozhenko, 2020

Storozhenko, S. Yu., 2020, New species of the genera Cranae and Lucretilis (Orthoptera: Acrididae) from Indonesia with taxonomic notes on the tribe Cranaeini, Zoosystematica Rossica (China) 29 (2), pp. 267-277 : 275-276

Lucretilis balikpapan Storozhenko , sp. nov.

( Figs 14–18)

Holotype. Male , Indonesia, East Kalimantan Prov., 20 km N of Balikpapan City, Bukit Bangkirai Park , forest on hills, 01°1′43″N, 116°51′49″E, 4–8.X 2015, coll. A. Gorochov, M. Berezin, I. Kamskov, E. Tkatsheva ( ZIN).

Description. Male (holotype). Body rugose, medium-sized for this genus ( Figs 14, 15). Head slightly shorter than pronotum; occiput and genae punctuated; face rugose. Face in profile distinctly reclinate and weakly excised below base of antennae. Frontal ridge distinct to median ocellus, sulcate, parallel-sized ( Fig. 16). Vertex between eyes 1.3 times as wide as frontal ridge between antennae. Fastigium of vertex short, distinctly separat- ed from vertex by furrow; lateral margins of fastigium bordered by low carinulae; foveolae absent. Eyes large, oval; vertical diameter of eye 1.9 times as long as subocular furrow. Antennae filiform, 23-segmented, reaching middle of hind femora; mid segments of antennae 3.6–4.0 times as long as width. Pronotum rugose, long, crossed by three transverse furrows; prozona 1.9 times as long as metazona; anterior margin of prozona rounded; posterior margin of metazona triangular round- ed; lateral carinae absent; median carina weak and low. Prosternal process transversally lamellate, at apex slightly widened. Mesosternal lobes subsquare, 1.1 times as wide as long; mesosternal interspace narrow, 2.0 times as long as wide; metasternal lobes touching each other in middle. Tegmina 4.1 times as long as wide, touching each other in resting position, reaching posterior margin of seventh abdominal tergite; apex broadly rounded. Hind wings slightly shorter than tegmina. Hind femora moderately slender, 5.1 times as long as their maximal width; dorsomedian carina weakly serrate; ventral genicular lobes with one sharp but short tooth. Hind tibiae with 7–8 out- er and 7–8 inner dorsal spines; outer apical dorsal spine small. Hind tarsi short, not longer than half of hind tibiae; third segment (without claws) 1.4 times as long as first one; arolium large, reaching apex of claws. Tympanum large, oval. Tenth abdominal tergite with very short furculae on posterior margin. Supra-anal plate triangular, as long as its width near base, with lingua-like apex; median longitudinal sulcus deep. Cerci conical, 2.5 times as long as their width near base. Subgenital plate short, obtuse.

Male genitalia ( Figs 17, 18). Epipallus bridgeshaped; bridge broad and completely divided; ancorae broad, triangular; anterior and posterior projections short, broadly rounded; outer lophi of epiphallus great; inner lophi absent; oval sclerites narrowly elongated. Cingulum sclerotised, consisting of broad apodemes, zygoma, and rami; zygoma broadly rounded apically, covering arch of cingulum; valves of cingulum broad, divided, apically curved. Apical valves of penis with broadly rounded apex, slightly shorter than cingular valves; basal and apical penis valves connected by narrow, strongly curved and unbroken flexure.

Body (after alcohol preservation) light brown with blackish marks ( Figs 14, 15). Dorsal side of head light brown with two lateral dark brown stripes; fastigium of vertex brown with lateral sides dark brown. Genae light brown with small black spot below eyes. Face and clypeus brown; labrum light brown; mandible brown with black apex. Antennae black except light brown scapus. Pronotum brown; transverse furrows dark brown. Prosternal process and sternal plate brown, with a few small blackish spots. Tegmina light brown, with broad black stripe along costal margin. Fore and mid legs yellowish brown. Hind femur light brown, without any dark marks; dorsal genicular lobes shining brown; ventral genicular lobes light brown; tooth with black apex. Hind tibia yellowish brown; dorsal spines black. Tarsi brown; claws with black apex. Abdomen dorsally brown; tenth tergite light brown with dark brown furculae; supra-anal plate brown. Cerci brown. Sternites and subgenital plate light brown.

Female unknown.

Measurements (length in mm). Male body: 21.5; antenna: 16.7; pronotum: 4.6; tegmen: 10.4; hind femur: 13.2; hind tibia: 11.5.

Distribution. Indonesia: Kalimantan Island (East Kalimantan Province).

Comparison. The new species is most similar to L. antennata in the colour of body and appendages but distinguished from the latter by the presence of a wide black stripe along the costal tegminal margin (in L. antennata , this tegminal area in the basal half light bluish green, the apical half more or less hyalinous, and the posterior margin also light bluish green). From two other congeners known from Kalimantan I., the new species differs in completely light brown face and pronotum (in L. maculata , the face is black with a small yellow spot near the base of antennae, and the disc of pronotum is black with four large yellow spots; in L. splendens , the face is completely black, the disc of pronotum is black and bordered along each lateral margin with a longitudinal yellow stripe).

Etymology. The new species is named after the type locality.