Myopsocus amacayacu n. sp.

(Figs 67–72)

Diagnosis. Belonging to the assemblage of species that does not present the forewing with the apical margin of some of its cells scalloped. As in M. pennyi and M. caliensis it presents pyriform phallosome and enlarged external parameres, but unlike M. pennyi it does not present the hypandrium with medial apical bifurcated process and unlike M. caliensis it presents the external parameres broadly fused medially and their endophallus is neither elongated nor apically more broadened (Fig. 72).

Male. Color. Head (Fig. 69) brown, genae, anteclypeus and labrum darker. Compound eyes dark brown to black, ocelli hyaline, with ochre centripetal crescents; antenna pale brown; maxillary palps dark brown. Forewing (Fig. 67) with brown spots and hyalines areas, pterostigma brown, darker apically, with small brown spots that extends outside the margin, while retaining its shape, alar margin dotted, veins pale brown to brown. Hindwing (Fig. 68) smoked, with veins brown and dotted alar margin. Legs: coxae and trochanter dark brown, femur dark brown proximally, light brown distally, with subapical brown spot, tibia and tarsi pale brown, t2–t3 darker. Hypandrium, Paraprocts, epiproct and phallosome brown.

Morphology. As in diagnosis, plus the following: Head (Fig. 69): H/MxW: 1.31; compound eyes large, H/ D: 1.75; IO/MxW: 0.52. Vertex emarginated, medially V-shaped, below upper level of compound eyes. Outer cusp of lacinial tips broad, with three denticles; Mx4/Mx2: 1.63. Forewings (Fig. 67): L/W: 2.77. Pterostigma: lp/wp: 2.33, areola postica apically angled, a little wider than tall: al/ah: 1.29. Hindwings (Fig. 68): l/w: 2.84. Hypandrium semioval, wider basally (Fig. 71), anterior margin concave, with setae and macrosetae. Phallosome pyriform, external parameres widened, distally fused, endophallus membranous, more sclerotized mesally (Fig. 72): Paraprocts somewhat ovoid (Fig. 71), with acuminate apical process, directed inward, a field of setae and macrosetae on distal area; sensory fields with 24 trichobothria on basal rosettes. Epiproct (Fig. 71) semioval, with transverse projection and scattered setae and macrosetae in the distal field, as illustrated.

Measurements. FW: 2250, HW: 1775, F: 442.5, T: 825, t1: 323, t2: 52, t3: 68, ctt1: 16, f1: 475, f2: 312.5, f3: 275, f4: 257.5, f5: 192.5, f6: 157.5, Mx4: 130, IO: 230, d: 270, D: 331, IO/d: 0.85, PO: 0.82.

Material studied. Holotype male. COLOMBIA. Amazonas, Leticia, San Vicente de Amacayacu, Totumo trail, 03º42’42.8”S: 70º2’01.9”W. 77m. 12–13.viii.2015. MUSENUV slide code: 31322. N. Carrejo, R. González. Led light trap in forest canopy.

Etimology. The specific epithet is a noun in apposition, is dedicated to the population of San Vicente de Amacayacu (Amazonas, Leticia, Colombia) where the holotype was found.