Mermerizon inbio Reemer, 2013

Figs 113–117, 124.

Studied type specimens. HOLOTYPE. COSTA RICA. Male. Label 1: " COSTA RICA. Prov. Guanacaste, P.N. / Rincón de la Vieja, Send. a las aguas / termales, 900-1000 m, 6-7 OCT / 2001. D. Briceño, Red con Aguamiel. / L_N_305843_392970 #64950"; label 2: "INB0003380896 / INBIOCRI COSTA RICA "; label 3 (red): "Ultimo especimen en / BD A. Lépiz / 2-7-2002 " / other side: "?MCR-25". Coll. INBIO .

Redescription (based on holotype)

Adult male Body size: 7.5 mm.

Head. Face occupying about 1/4 of head width in frontal view; yellow; yellow pilose, with narrow bare median line on dorsal half. Gena yellow. Frons black; yellow pilose laterally, black pilose posteriorly. Vertex dark yellow, except black at and around ocellar triangle; black pilose. Occiput black, except yellow posteriad of vertex; black pilose on dorsal half, yellow pilose on ventral half. Eye bare. Antennal fossa about as high as wide. Antenna with scape dark brown, pedicel and basoflagellomere yellowish brown; antennal ratio approximately as 4:1:4.

Thorax. Scutum blackish brown, except yellow on notopleuron and around postpronotum and postalar callus; black pilose. Postpronotum, postalar callus and scutellum yellow; black pilose. Scutellum semicircular, without calcars, Anepisternum blackish brown; convex, without sulcus; black pilose on anterior part and along posterior margin, widely bare in between. Anepimeron brown; black pilose on dorsal 1/4. Katepisternum yellow dorsally, brown ventrally; bare. Katepimeron yellow. Katatergum long black yellow microtrichose. Anatergum short pale microtrichose. Calypter blackish. Halter yellowish brown.

Wing: hyaline; microtrichose, except bare on 1st costal cell, basal 1/4 of cell br, basal 1/3 of cell bm, anterobasal 1/4 of cell cup.

Legs: Front and mid legs yellowish brown; black pilose. Hind leg blackish brown, except basal 1/2 of tibia and apical four tarsomeres yellowish brown. Front and mid coxae and trochanters yellowish brown; yellow pilose apically. Hind coxa and trochanter dark brown; black pilose.

Abdomen. Tergites and sternites yellowish; yellow pilose, except sternite 1 bare. Genitalia as in fig. 124. Female. Unknown.

Diagnosis. Distinguished from the other two known species of Mermerizon by the black pilose mesoscutum. Distribution. Only known from Costa Rica.