Dicepolia amazonalis, Hayden, James E., 2009

Hayden, James E., 2009, Taxonomic revision of Neotropical Dicepolia Snellen (Lepidoptera: Crambidae), Zootaxa 2237, pp. 1-33 : 16-19

Dicepolia amazonalis sp. nov.

Figures 7, 23, 39

Material examined: Holotype 3 (NHM): Santarem / R. Jutahi / 4/2/75 / Light // 89-8 // [red label] HOLOTYPE / Dicepolia / amazonalis / J.E. Hayden // BMNH (E) #846374. Not dissected. Ex type series of D. roseobrunnea (Warr.) , NHM Drawer 217-111 ( Calamochrous ).

Paratypes: Brazil: 13: Fonte Boa, / Upp. Amazon, / August 1907 / (S.M. Klages). // Rothschild / Bequest / 1939-1 // BMNH (E) #846375. 13: Fonte Boa, / Upp. Amazon, / July 1907 / (S.M. Klages). // Rothschild / Bequest / 1939-1. // B.M. Pyralidae / Genitalia slide / No. 22134 3 // BMNH (E) #846376. 13: Fonte Boa, / Amazonas, / July 1907 / (S.M. Klages). // Rothschild / Bequest / 1939-1 // BMNH (E) #846377 (all NHM). 13: Mouth R. Jutahy / Rio Solimões / BRAZIL 3 Sept '20 / Cornell U.Exped / Lot 607 Sub 173 // Endolophia roseobrunnea (Warren) / Det. E. G. Munroe 1986 // J.E. Hayden SLIDE No. 227 3 ( CUIC type no. 7353).

Diagnosis: Frontoclypeus prominent, acutely arched. Forewing mostly chocolate brown; forewing PM distinctly bent basad on 1A, like sickle. Hindwing PM visible on cubital veins and 1A. Male foreleg androconia absent. Male lamelliform structures on distinctly raised bases; S8 spinule strongly reduced. Vinculum concave with slight medial convexity. Phallus nearly straight, with one full turn; cornutus absent.

PLATE 2. Male 8th abdominal segment, sternite on right. J.E. Hayden prep. numbers unless indicated. Scale = 1mm. 19. D. roseobrunnea (221); 20. D. rufitinctalis (234); 21. D. rufitinctalis robust-cornutus form (247); 22. D. aerealis (360); 23. D. amazonalis (BMNH 22134); 24. D. artoides (80); 25. D. bicolor (NHM 18009); 26. D. cuiabalis (NHM 22135). a, pleural androconium; la, lamelliform structure; ll, lateral lobes of posterior scale-fringe; p, piluli.

PLATE 3. Male 8th abdominal segment, continued. Scale = 5mm for wings, 1mm otherwise. J.E. Hayden prep. nos. unless indicated. 27. D. vaga holotype (241); 28. D. venezolalis (359); 29. D. marginescriptalis (287); 30. D. munroealis , holotype 3 (MNHN; scale not available); 31. D. rufeolalis (266); 32. D. aerealis tympanal organs (360), st, saccus tympani; 33. Wing venation, D. roseobrunnea Ƥ (370); 34. Wing venation, D. rufitinctalis 3 (275).

Description: Eye length 0.90 ± 0.06 mm. Frontoclypeus sharply projecting 0.30 ± 0.06 mm, acute in profile, frontoclypeus acute. Frons slightly rounded. Antennae brown. Male antennae strongly ciliate (as long as width). Labial palpi 1.6 ± 0.1 mm in all measured specimens (n = 4), wine-red with interspersed black scales. Mean palpi:eye ratio 1.8. Maxillary palpi brown. Haustellum with brownish-white scales. Vertex pale brownish yellow. Cervical scales white. Dorsal thorax slightly orange brown. Ventral thorax white. Legs all white, except gray areas: inside of foreleg femur, foreleg tibia, outside of midleg femur, and a dark gray line along dorsal edge of midleg tibia. Outer: inner spur ratios: midleg, 0.5; hindleg, 0.75.

Forewing length 7.8–9.0 mm (mean 8.5 ± 0.2 mm), width 3.8–4.2 mm (mean 4.1 ± 0.2 mm), mean ratio 2.1 (n = 5) (fig. 7). Color mostly brown, with reddish color restricted to distal veins and space between Sc and R; somewhat more orange in one specimen. Costa and lines dark brown. Antemedial line complete from costa, bent distad on 1A. Postmedial line roundly bowed, distinctly bent basad on 1A. Marginal fringe basal scales dark gray, distal scales grayish white. Scale-tooth absent from posterior edge. Forewing underside brown, pale in anal area; lines absent. Hindwings very pale brownish bronze. Termen brown. Postmedial line visible around cubital and anal systems, more so than in D. roseobrunnea . Faintly rosaceous patch around 1A.

Abdominal dorsally yellowish brown, paler ventrally and darker distally. Male tergum 8 scale fringe and androconia grayish brown. Valvae yellowish cream, S7 tuft same but paler.

Male genitalia (figs 23, 39): S8 anterior emargination round, not broad. S8 posterior edge slightly emarginate between lamelliform chaetae, with small medial spine. A8 pleural androconium absent. Lamelliform structures with bases elevated on short arms, bases parallel-sided laterally. Vinculum broadly concave, with slight medial production. Gnathos arms converging at 80- to 90-degree angle; gnathos lateral arms robust; median element longer than arms. Costal flutes absent. Valva oblong. Phallus with 1 spiral. Cornutus absent.

Female genitalia: unknown.

Etymology: In reference to the distribution.

Distribution: Central Amazon Basin, along the main trunk of the Amazon River and tributaries.

Flight period: February (Santarem); July–August (Fonte Boa), September (Rio Solimões).

Similar species: D. roseobrunnea and D. vaga have brownish red or brownish orange maculation, and in these species the forewing PM line is smoothly curved on 1A, not sharply bent. D. roseobrunnea has a male foreleg androconium and lacks a distinct hindwing PM line. The present species shares an acutely arched frontoclypeus only with the small, bronzy species D. aerealis , D. rufitinctalis , and D. venezolalis .

Remarks: This species seems to be multivoltine like D. roseobrunnea , but its distribution is much more restricted. The few observed specimens are very uniform in size and maculation.