64 
Psyche 
[March 
Acknowledgements. I appreciate the cooperation of the fol- 
lowing people and institutions who made their collections at my 
disposal: H. W. Levi, Museum of Comparative Zoology; N. I. Plat- 
nick, American Museum of Natural History; F. R. Wanless, British 
Museum, Natural History; R. E. Leech, Alberta Environmental 
Research Inst.,; T. J. Zavortink, California Academy of Science 
Museum; C. E. Valerio, University of Costa Rica. 
I am also grateful to Herbert W. Levi for his review of the manu- 
script, and his help in obtaining type specimens. Lynchburg College 
provided publication expenses. 
Tinus F. Pickard-Cambridge 
Tinus Pickard-Cambridge, F., 1901, Biol. Centrali- America, 2:310. Type by mono- 
typy, Tinus nigrinus F. Pickard-Cambridge. 
Description. Carapace: moderately high, longer than wide. 
Eyes: posterior row moderately recurved, PE subequal and larger 
than AE, PME closer to each other than to PLE; anterior row slight- 
ly procurved, AME larger than ALE and closer to them than to each 
other, ocular quadrangle wider at top than at bottom and higher 
than height of clypeus. Sternum: lanceolate, about as long as wide. 
Chelicerae: moderately robust with three promarginal, three retro- 
marginal teeth on fang furrow. Legs: spinose, unmodified, III 
shortest, I, II, IV subequal. Abdomen: longer than wide, greatest 
width at the middle, slightly overlaps posterior edge of carapace. 
Male. Pedipalp : median apophysis spatulate, membranous, 
usually white, directed anteriorly; conductor conspicuous, spatu- 
late, directed anteriorly, located laterally; embolus long, slender, 
coiled 3-5 times; tegulum membranous, screw-shaped with 3-6 
lamellae visible; tibia l apophysis arises dorsally, bends retrolateral- 
ly, sometimes bifid with a dorsal spur. Female. Epigynum: pair 
of lateral hemispherical elevations, median elevation present or ab- 
sent. Internal copulatory apparatus: variable. 
Note : Body conformations and eye characteristics among the 
various species are quite uniform and offer few useful diagnostic 
characters. The different relative overall sizes of some species, 
measured in carapace length, is an obvious exception. 
The dorsal color pattern of most species also offers little help be- 
cause of the variability within each species and the overlapping of 
the characteristic features of the pattern. A “typical” color pattern 
can be exemplified by that of Tinus peregrinus (Fig. 2). The cara- 
