Allodrilus horizontalis Evangelista sp. nov.

Figures 19, 32, 42, 53, 109 –114.

Diagnosis. Pronotum yellow mottled brown, with pair of large brown bands from basal median carina towards posterior process, anterior band fading before reaching humeral angles, and second enlarged posteriorly, interrupted by large irregular white transversal ring at mid-length; lower margins of vertex distinctly sinuous in frontal view; pronotum contour line feebly arched, almost straight, suddenly constricted apically; branches of aedeagal apophysis curved downwards apically.

Description. Holotype male. Pronotum mostly yellow mottled brown, with pair of V-shaped brown bands extended from basal median carina towards posterior process, curved downwards in lateral view, not reaching lateral margins, anterior band fading slightly past humeral angles, the second band enlarged posteriorly, interrupted by large irregular transverse white ring at mid-length; apex of posterior process brown spotted yellow, with preapical yellow band. Vertex yellow variegated ferruginous and dark brown. Forewings hyaline, with dark macula at apex of basal cell and adjacent area of discoidal cell; coriaceous areas brown and yellow, veins brown spotted yellow along basal two-thirds, lighter on apical third. Ventral side of head brown; ventral side of thorax, abdomen and legs yellow, legs spotted with brown.

Head: vertex pentagonal, wider than long; ocelli closer to eyes than to each other; area below ocelli strongly concave, lower margins of supra antennal ledges sinuose in frontal view, distinctly curved forwards in frontolateral view; frontoclypeus exceeding more than half of its length below lower margins of supra antennal ledges, tapering to rounded apex.

Pronotum: median carina prominent, keeled at metopidium humeral angles triangular, well-marked; in lateral view, dorsum low, arched from metopidium to above humeral angles, nearly straight along mid-dorsum; posterior process laterally compressed past humeral angles, gradually tapering towards apex, distinctly constricted preapically; apex triangular, narrow and acute, reaching the apex of fifth apical cell (but not fourth); postocular lobes triangular, scoop-shaped.

Forewings with coriaceous areas occupying approximately one-fourth to one-fifth of clavus, R cell, and first basal cell; discoidal cell pentagonal.

Laterotergites IV–VII distinctly lamellar, directed downwards and sideways (VIII sternite not observed). Subgenital plate slightly wider and emarginate at base, constricted at basal fourth or fifth, where lobes separate; lobes elongate, slender, dorsally folded to accommodate branches of aedeagal apophysis, internal margins sinuous in ventral view, curved to rounded apex. Lateral plate ovoid, deflected inwards, medially constricted into small tubercle, mostly visible in caudal view. Aedeagus U-shaped, shaft small in comparison to lateral plates and aedeagal apophysis, lacking tubercles or spines; apophysis slender and elongate, arms of apophysis directed upwards, not bifurcated distally, narrowed to setose apex, strongly deflected downwards. Styles comma-shaped, deflected upwards to nearly truncate apex, with small ventral lobe, curved sideways.

Female unknown.

Distribution. BOLIVIA (Santa Cruz: San Rafael).

Measurements. Holotype male (mm): body length: 7.08; pronotal length: 6.08; maximum height of pronotum: 1.83; length of tegmina: 6.25; pronotal width: 2.67; head width: 2.50; vertex width: 1.50; vertex length: 1.33.

Examined material. Holotype male from BOLIVIA: Santa Cruz [José Miguel de Velasco Province]: San Rafael [village of San Fermin], ‘S[an]. Fermin / Boliv[ia].’, ‘N. Holmgren [col.]’, ‘Riksmuseum / Stockholm’ (NHRS).

Notes on type specimen. Holotype pinned through right side of pronotum between thorax and abdomen, in good state of preservation.

Remarks. A. horizontalis sp. nov. can be readily recognized by its external morphology, i.e. the shape of the vertex (strongly convex with lower margins of suprantennal ledges sinuous), and the outline of dorsum in lateral view (nearly straight, and constricted pre-apically). This species also shows distinctive features of male genitalia, especially the branches of aedeagal apophysis, strongly curved downwards apically.

Etymology. The specific epithet, derived from the Latin ‘ horizontalis ’ meaning ‘horizontal’, refers to the orientation of the dorsum, feebly arched from above humeral angles to apex of posterior process, and appearing amost parallel to longitudinal body axis.