(Figs. 201–203, 354, Map 36)

Diagnosis.— Glyphidocera formae is similar to G. vappae but differs by a slightly larger and more widely separate costal furcae of the valva, a longer apical curnutus of the aedeagal vesica, and vesica of aedeagus with several small cornuti.

Description.— Head: Vertex and frontoclypeus pale brownish yellow; outer surface of labial palpus brown intermixed with few pale brownish­yellow scales to apical margin of segment II; inner surface pale brownish yellow intermixed with few brown scales; scape of antenna pale brownish yellow, flagellum with alternating bands of pale brownish­yellow and brown scales; male 4 th flagellomere dorsally protuberant and curved, forming a deep concavity opposite slightly excavated flagellomeres 5–6; concavity nearly closed by a few setiform scales on apex of protuberance of 4 th flagellomere; proboscis pale brownish yellow.

Thorax: Tegula and mesonotum pale brownish yellow. Legs brown intermixed with pale brownish­yellow scales to apical margins of all segments and tarsomeres, or as above except, pterothoracic legs or hindleg pale brownish yellow. Forewing (Fig. 354): Length 5.3–6.9 mm (n = 36), pale brownish yellow intermixed with brownish­orange and brown scales; cell and surrounding areas paler than marginal areas; cell with 2 small, brown spots, 1 spot near middle, 1 spot near distal end; marginal spots present or absent. Undersurface brown intermixed with pale brownish­yellow scales along costa. Hindwing: Brown.

Abdomen (Fig. 201): Male with 4 transverse, irregular rows of sex scales on intersegmental membrane between terga 2–3. Anterior row of sex scales and a few scales along the posteromedian margin appear smaller than sex scales occupying the middle rows.

Male Genitalia (Figs. 202–203): Uncus elongate, wide at base, broadly constricted near 1 / 3, slightly rounded apically, apex narrowly rounded and setose; gnathos sparsely setose, protuberant, moderately wide throughout length, apically upturned; tegumen slightly widened basally; dorsal strut of tegumen with arms convergent, medially fused from posteroventral margin, extending narrowly to base of uncus; costa of valva nearly straight from a shallow depression beyond basal, digitate process to dorsal furca; apex widely bifurcate, each furca large, about equal in size, parallel; sacculus twisted apically, constricting valva near midlength, widening distoventrally, forming an elongate and broadly rounded cucullus; cucullus membranous and setose; vesica of aedeagus with several stout, conical and spinelike cornuti, and bearing an elongate, apical cornutus; cornutus with one side shortened near midlength, exposing a hollow, basal cavity.

Female Genitalia: Unknown.

Holotype, ɗ, “Sector Cerro Cocori, F[in]ca de E. Rojas, 150 m, Prov[incia] Limón, COSTA RICA, Oct. 1991, E. Rojas, L­N­ 286000, 567500 ”, “ INBio: COSTA RICA: CRI 001, 399570 ” [bar code label], “ INBio, ɗ Genitalia Slide by D. Adamski, No. 710 ” [yellow label].

Paratypes (35 ɗ): 3 ɗ, Same label data as holotype except, “Nov.”, “ CRI 000, 501469 ”, “Slide No. 689 ”; “ CRI 000, 364130 ”, “Slide No. 698 ”; “Mar.”, “ CRI 000, 363645 ”, “Slide No. 711 ”; 1 ɗ, “Est. Magsasay, P. N. Braulio Carrillo, 200 m, Prov. Here., COSTA RICA, A. Fernandez, Oct. 1990, L­N­ 264600, 531100 ”, “ PARATYPE, Glyphidocera guaroa, Adamski ”, “Slide No. 1071 ”; 31 ɗ, “ COSTA RICA, Heredia, Est. Biol. La Selva, 50–150 m, 10 ° 26 'N, 84 °01'W, Mar. 1996, INBio­OET”, “ 11 Marzo 1996 ”, “L/05/ 183, Arboleda”, “ CRI 002, 057874”, “Slide No. 889 ”; “L/00/ 181, STR 2050 m ”, “ CRI 001, 250749 ”, “Slide No. 921 ”; “L/00/ 180, STR 1850 m ”, “ CRI 001, 250765 ”; “ CRI 001, 250756 ”; “ 4 Marzo, L/ 00/ 173, CES 600 m ”, “ CRI 002, 057034”; “ 6 Marzo, L/00/ 179, CCC 650 m ”, “ CRI 002, 057669”; “ 19 Marzo, L/00/ 191 ”, “ CRI 002, 058453”; “L/00/ 189, CES 300 m ”, “ CRI 001, 257462 ”; “ CRI 001, 257458 ”; “ CRI 001, 257460 ”; “L/00/ 191, CCC 650 m ”, “ CRI 002, 058493”; “ 21 Marzo, L/00/ 194, SOR 500 m ”, “ CRI 001, 257215 ”; “ 8 Abril 1996, L/00/ 207, STR 2550 m ”, “ CRI 002, 059842”, “Slide No. 870 ”; “ CRI 002, 059773”; “ CRI 002, 059776”; “ CRI 002, 059814”; “ 22 Abril, L/00/ 221, CES 200 m ”, “ CRI 002, 061218 ”, “L/ 00/ 223, SOR 700 m ”, “ CRI 060894 ”; “ 24 Abril, L/00/ 227, STR 500 m ”, “ CRI 002, 060584 ”; “ 9 Feb., L/00/ 134, SSO 80 m ”, “ CRI 001, 251187 ”; “ 8 Ene. 1993, Arboleda, L0001”, “ CRI 001, 218973 ”, “Slide No. 900 ”; “ 13 Abril, Bosque primario, L/02/026”, “ CRI 231201 ”; “ 14 Junio, L/01/040”, “ CRI 001, 228275 ”; “ 17 Octubre, L/01/076”, “ CRI 001, 239933 ”; “ 11 Noviembre, L/03/081”, “ CRI 001, 236964 ”; “ 10 Febrero 1994, Bosque secundario, L/03/097”, “ CRI 001, 259619 ”; “ CRI 001, 259614 ”; “ CRI 001, 259623 ”; “ 1 Julio 1994, L/00/ 111 ”, “ CRI 001, 262196 ”; “ 4 Julio, Bosque primario, L/02/ 117 ”, “ CRI 001, 244461 ”; “ 28 Feb. 1996, L/00/ 169, STR 375 m ”, “ CRI 001, 250676 ”, (25 in INBio, 10 in USNM).

Distribution (Map 36): Glyphidocera formae is known from three collecting sites in north­central Costa Rica, north of the Cordillera Central.

Etymology: The species epithet formae is derived from the Latin word for beauty ­ forma.