Costarina san, new species (Figures 268–278) TYPES: Male holotype, female allotype, and two male and two female paratypes from cloudforest litter taken at an elevation of 1800 m at km 117 on the Inter-American Highway, 19 km north of San Isidro, 9°28′N, 83°42′20″W, San José, Costa Rica (Feb. 15, 1998; R. Anderson), deposited in AMNH (PBI_OON 49240). DIAGNOSIS: Males can be distinguished by the relatively large, rectangular proximal embolar prong and the wide, short, distally directed distal prong (figs. 268–273), females by the very small genital atrium and the rounded paramedian lobes on the posterior genitalic elements (figs. 277, 278). MALE (PBI_OON 49240, figs. 268–273): Total length 2.04. Endite ventral process wide, heavily sclerotized distally; dorsal process narrow. Femur II p0-0-2, r0-1-0; metatarsus I v2-2-2. Embolus proximal prong rectangular, with sharp prolateral extension; distal prong with translucent flange (N = 3). FEMALE (PBI_OON 49240, figs. 274–278): Total length 2.35. Spination typical. Conspicuous dark markings present lateral to right and left sides of genital atrium, posterior elements with rounded paramedian lobes (N = 3). DISTRIBUTION: San José.

Published as part of Platnick, Norman I., Berniker, Lily & Víquez, Carlos, 2014, The Goblin Spider Genus Costarina (Araneae, Oonopidae), Part 2: the Costa Rican fauna, pp. 1-76 in American Museum Novitates 2014 (3794) on page 13, DOI: 10.1206/3794.1, http://zenodo.org/record/5365505