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Wiley), 1 female (TMM); 17 Feb. 1970 (coli. unknown),1 female, 7 immatures (TMM); 28 March1970 (W. Elliott), female allotype, female paratype(AMNH); 8 Jan. 1971 (W. Elliott, J. Shepperd),male paratype (AMNH), 1 immature (TMM).Diagnosis.-This is the only species of Agastoschizomuswith a divided metapeltidium. Malesmay also be separated from males of A. huitzmolotitlensisby the shape of the male flagellum, which ismore slender and more pointed apically in A. huitzmolotitlensisthan in A. lucifer. The spermathecallobes of A. lucifer are long and slender with a slightapical enlargement, whereas in A. stygius the lobesare short and decrease in size apically. Females mayalso be distinguished from A. stygius by the presenceof segments/articles I and III-V in the femaleflagellum. Agastoschizomus stygius has only segments/articlesIV and V present. The presence ofventrolateral lobes on the male flagellum and thepresence of segments/articles on the female flagellumreadily separate this species from A. patei.Description.-Male holotype (length from distaledge of propeltidium to base of flagellum, 8.14mm). Color orangish.Cephalothorax: Propeltidium 2.24 mm long, 1.04mm wide; with one apical seta on anterior process8283848687IFigs. 82-87.-Agastoschizomus lucifer: 82, male flagellum, dorsal aspect; 83, male flagellum, lateral aspect; 84, male flagellum,ventral aspect; 85, male pedipalp, lateral aspeet; 86, female flagellum, lateral aspect; 87, female spermathecae. Scale lines = 0.25 mmfor Figs. 82-86, 0.05 for Fig. 87.64