Adepimelitta, Clarke & Flora & Fauna & Casilla & de & Sierra & Bolivia, 2016

Clarke, Robin O. S., Flora, Hotel, Fauna, Casilla, de, Santa Cruz, Sierra & Bolivia, 2016, Provisional revision of the genus Epimelitta Bates, 1870 and associated genera, with a brief synopsis of the genus Acorethra Bates, 1873 (Coleoptera, Cerambycidae), Insecta Mundi 2016 (504), pp. 1-43 : 28-29

Adepimelitta gen. nov.

( Fig. 37-42 )

Type species: Charisia debilis Gounelle, 1911 , here designated.

Description of the genus. Small, total length 6.4-9.0 mm, and narrow (total length/width metathorax 5.8-6.8). Forebody (f) distinctly shorter than abdomen (a), f/a 0.74-0.85. Head: rather narrow (widths prothorax/head with eyes 1.11-1.19 in male, 1.21-1.30 in female); rostrum short (in Bolivian specimens of A. debilis width/length 3.14-3.43) to moderately long (in A. eupheme and Goiás female of A. debilis 2.40- 2.50 respectively). Labrum transverse, rectangular, about three times wider than long. Clypeus almost planar with frons, apex hardly wider than labrum. Apical palpomeres truncate at apex, those of maxillary fusiform, those of labium cylindrical and narrow. Galea long, narrow. Inferior lobes of eyes: almost contiguous in male, width of one lobe/interocular distance 4.87-5.67 in male, in female 0.92-1.08. Superior lobes: of eyes almost parallel-sided, with 6-9 rows of moderately large ommatidia, laterally narrowed (by about one third their mesal width); and separated by 3.0-3.6 the width of one lobe. Antennal tubercles weakly raised, rounded at apex, and separated by three times width of scape (0.30-0.35). Antennae: more robust in female; apex in male reaching middle of urosternite II, in female near apex of I. Length of scape 0.85-1.10 mm; antennomeres III-V filiform, III 1.05-1.13 longer than scape, slightly longer than IV, as long as V; VI filiform to subfiliform; VI-X incrementally shorter and more quadrate; towards apex VI (sometimes) and VII-X rather crassate, hardly serrate in male, weakly so in female; XI ovate, shorter than VII, with moderately small to very small apical cone. Prothorax: in male 1.10-1.12 longer than wide, in female usually quadrate; trapezoidal (in most specimens examined), but may be cylindrical and slightly elongate (in some females from the Bolivian Chaco); tumid adjacent to basal angles, these well rounded (in A. debilis ), strongly so (in A. eupheme ), leaving width of base hardly wider than apex (widths apex/base 0.91-0.95); basal margin almost straight, not juxtaposed between elytral humeri; sides widest usually well behind middle, prothoracic quotient 1.40-1.54, or at middle (in some females of A. debilis ). Pronotal surface moderately convex, disc almost regular (laterally with nearly obsolete arc of paired calli); apical constriction weak or absent, basal constriction weakly abrupt and narrow. Prosternum: only moderately declivous across middle; at midline planar with its process; prosternal process flat; base sublaminate, 5-8 times narrower than width of procoxal cavity; apex oblanceolate. Procoxal cavity rather widely plugged laterally; moderately widely open behind. Scutellum: small, trapezoidal; pubescence hiding details. Elytra: cuneate; rather flat, but slightly depressed across apical third (more strongly depressed in male A. eupheme ); 1.76-1.82 longer than width of humeri (Chaco males and females of A. debilis with slightly shorter elytra; and in one of three females elytra only 1.67 longer than width of humeri); apex nearly reaching middle of urosternite I; laterally weakly, or not at all arced and hardly divergent apically; apical quarter moderately gaping. Humeri: hiding mesepimera; hardly projecting, but square, and weakly prominent. Each elytron gradually, but not strongly narrowed to rounded, unarmed apex; with broad translucent panel (in A. eupheme ), or these almost entirely suffused with black pigment (in tropical specimens of A. debilis , including the Goiás female), or without panel (in Chaco specimens of A. debilis ). Mesosternum: at center more prominent than sides; somewhat abruptly inclined to mesosternal process (but not deeply); base of process rather narrow (mesocoxal cavity 2.40- 2.67 wider than base of process), from nearly flat to moderately raised sides; apex of process lanceolate, pre-apex moderately diverging and surmounted by small tooth to each side. Mesocoxal cavity moderately widely open to mesepimerum. Lengths of mesosternum/metasternum 0.73-0.75. Metathorax: with almost straight, parallel sides, hind margin obliquely rounded to middle of metasternal apex; metasternum moderately tumid, often flattened for apical half, slightly more, to slightly less prominent than mesocoxae; metepisternum moderately wide and parallel-sided for basal two-thirds, subacuminate towards apex. Abdomen: in both sexes convex, weakly annulated, urosternite I the longest, II-IV subequal, or sequentially slightly shorter towards apex of abdomen. Abdominal process planar with abdomen in female, weakly inclined in male (slope about 15º). In male: abdomen narrow and cylindrical; widest near apex of urosternite I; basal urosternites slightly elongate, IV and V quadrate. Urosternite V: trapezoidal; surface weakly differentiated, with flat, U or V-shaped area demarcated by slightly raised sides (in A. debilis ), or strongly raised sides (in A. eupheme ); in both species leaving apical margin broadly emarginate between acutely pointed sides; when viewed laterally urosternite V winged, with somewhat acute apical angles. In female: abdomen fusiform, but much wider towards base than apex; widest at middle, or nearer apex of urosternite II; urosternite I subconical, slightly elongate; II and III transverse, IV slightly variable but, basically quadrate and trapezoidal. Urosternite V moderately elongate; somewhat trapezoidal; surface undifferentiated; sides weakly constricted across apical third, the latter moderately down-turned; apical margin weakly rounded, slightly flattened and minutely angled at sides. Legs: in male ratio lengths front/middle/hind leg 1.0:1.3-1.4:2.5-2.6, in female 1.0:1.4:2.6-2.8. Front and middle legs: body length/ length of legs about 3.0 and 2.2 respectively. Front leg: femur about as long as tibia; tibia moderately slender, narrow at base, gradually widening to apex, or widening to middle, parallel-sided to apex, apical margin rounded and somewhat lanceolate, apico-lateral angle usually with setose tubercle. Middle leg: femur moderately long, 1.3 longer than length of tibia; femoral clave moderately robust, in male length of femur/lateral width of femoral clave 4.4, in female 5.0; tibia rather slender, gradually widening to apex. Hind leg: rather elegant, body length/length of leg in both sexes 1.0-1.2; femur subcylindrical (clave gradually widening from base to pre-apex), apex reaching from basal third to apical third of urosternite IV; clave long, peduncle short, narrow, and hardly flattened (length clave/peduncle about 1.7). Metatibiae: straight (or slightly curved viewed laterally), slender, slightly widening from base to apex; moderately densely setose (these denser, rather short and robust in A. eupheme ), but far from being a brush. Metatarsus distinctly narrower than apex of metatibia; metatarsomere I cylindrical, II not pediculate, slightly elongate, somewhat trapezoidal or subcylindrical, III short shorter than II, the lobes narrow, hardly rounded at sides, and weakly divergent; in male first tarsomere 1.1-1.2 longer than II+III, in female 1.3- 1.4 longer.

Genitalia. Tegmen of A. debilis ( Fig. 55 ) and A. eupheme ( Fig. 56 ) similar, with lateral lobes characteristically robust. Median lobe of aedeagus: rather short (about 1,0 mm), slender, modestly arced, with acuminate apex; and dark bodies not evident. Tegmen: apical part longer than basal part. Apical part divided into two thumb-shaped lobes, these hardly divergent; each lobe with weakly curved mesal margin, rather long (length/width 5.3 in A. debilis , 5.5 in A. eupheme ), widest near middle, at apex asymmetrically rounded. Y-piece long and broad, the stem longer than the fork.

General pubescence. Much reduced (more so in female). Notable pubescence on body reduced to moderately dense, recumbent, whitish or ashy fascia on meso- and metasternum; with somewhat untidy, longer, erect, sparser hairs on most surfaces (including, and most characteristically, on elytra); on abdomen rather sparsely pubescent (especially in female), the hairs short and subrecumbent; towards sides mixed with long suberect hairs; and lacking dense recumbent fascia on latero-basal margins.

General puncturation. On upperside generally very dense, rather small, and alveolate; on elytra larger, granulate and confluent basally, contiguous apically, medially more spaced. Underside puncturation based on the state of its pubescence; the punctures generally very dense, simple, small to microscopic, and beveled; mixed with larger punctures on prosternum (these alveolate) and metasterna (these deeper and rounded). On abdomen punctures small, shallow and somewhat beveled; generally sparse to moderately sparse away from sides, towards sides rather denser.

Species included in this genus: Adepimelitta debilis Gounelle, 1911 , comb. nov.: A. eupheme ( Lameere, 1884) , comb. nov.

Figures

Figures 37-42. Adepimelittagen. nov. Fig. 37-40. Adepimelitta debilis (Gounelle, 1911): 37) male, dorsal aspect; 38) male, ventral aspect; 39) female, dorsal aspect; 40) female, ventral aspect. Fig. 41-42. Adepimelitta eupheme (Lameere, 1884), dorsal aspect: 41) male; 42) female.

Figures 49-57. Tegmen and median lobe of aedeagus in the genus Epimelitta and related genera. Fig. 49- 54. Magnification x1 (represented by2 mmscale bar):49) Epimelitta scoparia (Klug, 1825);50) Exepimelitta nigerrima (Bates, 1892); 51) Exepimelitta windsori sp. nov.; 52) Charisia melanaria Gounelle, 1911; 53) Charisia mneme (Newman, 1841); 54) Acorethra chrysaspis Bates, 1873. Fig. 55-57. Magnification x2 (represented by 1 mm scale bar): 55) Adepimelitta debilis (Gounelle, 1911); 56) Adepimelitta eupheme (Lameere, 1884); 57) Erratamelitta erato (Newman, 1840).