Male (Fig. 87), length: 9–11mm. Head: head wider than thorax; vertex 1/3 head width; gena 1/5 of head height, 1/3 of eye height. Fronto-orbital plate light gold tomentose to glabrous, with two rows of frontal setae, populated with short black hair-like setulae intermingled with setae; ocellar setae absent; 2 pairs of proclinate orbital setae and 1 pair of reclinate orbital setae present outside frontal row. Parafacial, densely covered in same gold tomentum as on fronto-orbital plate, entire surface reflective and brilliant appearance; bare along parafacial outside facial ridge, with a few black setulae intermingled with facial ridge setae and extending just below lowest frontal setae; facial ridge setose along 3/4 of its length; gena covered in yellow setulae. Antenna, pedicel orange; postpedicel dark brown almost black, 4–5X as long as pedicel; arista bare gradually tapering to a point at tip. Palps, dark yellow throughout and densely covered in short black setulae; clubbed. Vibrissa approximately 1/2 pedicel length from facial margin. Thorax: yellow ground color, with light pale-gray/gold tomentum dorsally, appearing dusty to the naked eye; scutellum ground color light yellow, slightly lighter than scutum, under microscope bronze tomentum throughout becomes visible; scutum with four narrow dorsal vittae, one outer pair, one inner pair, both broken at suture, inner pair extending only slightly beyond first post-sutural dorsocentral seta; lateral surface of thorax densely covered in long hair-like setulae, these setulae all yellow and whispy; chaetotaxy: 3 strong setae on postpronotum arranged in a line, acrostichal setae 3:3; dorsocentral setae 3:4; intra-alar setae 2:4; supra-alar setae 2:3; 4 katepisternal setae; scutellum, with 4–5 pairs of long marginal setae of subequal length; apical scutellar setae short erect, inserted slightly above plane of marginal setae; 1 complete row of scutellar discal setae just posterior to marginal setae. Wing: infuscate, slightly darkened brown at wing base, basicosta brilliant orange; both upper and lower calypters also white translucent; wing vein R₄₊₅ setose, bearing only 2–3 setulae at base; halteres orange. Legs: black overall, lightly covered in shimmering bronze tomentum, posterior margin of coxa on midleg and hindleg covered in yellow setulae; tarsal claws yellow-orange with black tips, with burnt umber pulvilli shorter than length of tarsal claws; anterodorsal row of setae on hind tibia irregular and not fringelike, with several longer stronger setae at least 2X as long as others. Abdomen: small and elongate globose, orange ground color; T1+2 with a light dusting of gray-gold tomentum mid-dorsally along depression, T3–T4 with a light dusting of gray gold tomentum dorsally, darker on T4, and brilliant gold tomentose throughout all of T5; ventral surfaces of T3–T5 with no distinct sex-patches present, and light gold tomentum throughout; middorsal depression on ST1+2 reaching to hind margin of tergite; ST1+2 with 1 pair of median marginal setae, 1 pair of median marginal setae present on T3, and complete rows of setae on T4 and T5.

Male terminalia (Fig. 88): sternite 5 with a deeply excavated median cleft along posterior edge, roughly Y-shaped, with reduced shoulders, margins covered in dense tomentum; posterior lobes rounded apically, with a group of strong setulae surrounded by many shorter weaker setulae. Anterior plate of sternite 5 approximately 1/2 length of posterior lobes; unsclerotized "window" on anterior plate of sternite 5 translucent, elongate and rectangular. Cerci in posterior view short bulbous basally, with a strong shoulder at midway tapered to ovoid, shorter than surstyli; rounded at apex, medially fused along 1/2 of their length. Cerci in lateral view, inflated along basal 2/3rds, sharply tapered with a curve at apical 1/3, giving it a shallow hooked appearance, caudal edge of apex of cerci protruding; cerci setose along basal 2/3rds, underside of cerci setose along basal 1/2 of length. Surstylus in lateral view, equilateral along its length rounded apically, straight, digitiform; surstylus appearing to be fused with epandrium; when viewed posteriorly surstyli straight. Pregonite narrow, well-developed, apically pointed, devoid of setulae. Postgonite, slightly narrow, as wide as pregonite, sharply pointed and straight, bladelike, with one small setula, postgonite subequal in length to pregonite. Distiphallus broadly cone-shaped, with a slender median longitudinal sclerotized reinforcement on its posterior surface and a broad, anterolateral, sclerotized acrophallus, bearing a slight anterior hook on anterior surface near apex, 1.6X length of basiphallus.

Female (Fig. 89) length: 9–12mm, overall morphology as in male differing in the following traits: Head: with 2–3 pairs of proclinate orbital setae in addition to single pair of reclinate orbital seta. Abdomen: as in male except for in its terminalia.

Belvosiaricardocaleroi sp. n. can be distinguished from all other Belvosia by the following combination of traits: yellow setulae on gena, orange basicosta, abdominal ground color orange, postocular margin of head gold tomentose.

Belvosiaricardocaleroi sp. n, is named in honor of Sr. Ricardo Calero in recognition of his decades of being part of the Parataxonomist Program of Area de Conservación Guanacaste (http://www.acguanacaste.ac.cr) in northwestern Costa Rica (Janzen and Hallwachs 2011). Interim species-specific name included in previously circulating databases and publications, Belvosia Woodley17.

Costa Rica, ACG, Guanacaste Province, 275–1150m elevation.

Belvosiaricardocaleroi sp. n. has been reared 20 times from one species of Lepidoptera in the family Noctuidae, Mythimnasequax (Franclemont, 1951) (N=20), in cloud forest, and dry forest.