210 
Psyche 
[December 
may be further evidence of common origin. In addition, several 
species have teeth on the posterior margin of the chelicerae. 
I would like to thank Dr. W. J. Gertsch for the loan of collections 
from the American Museum of Natural History (AMNH) ; Dr. A. 
M. Chickering for large collections from Panama and Jamaica now 
in the Museum of Comparative Zoology; for additional collections 
Mrs. D. L. Frizzell (Dr. H. Exline) of Rolla, Missouri; Mrs. Friz- 
zell and Dr. E. S. Ross for specimens from the California Academy 
of Sciences (CAS) ; Dr. O. Kraus of the Senckenberg Museum, 
Frankfurt (SMF) ; and Dr. R. V. Chamberlin for a specimen of the 
University of Utah collection (UU) ; Dr. E. Dresco, Paris, for 
making drawings of Meotipa species; Prof. M. Vachon of the Museum 
National d’Histoire Naturelle, Paris (MNHN) ; Prof. G. C. Varley 
of the Hope Department of Entomology, Oxford, and Dr. G. O. 
Evans, Mr. E. Browning, and Mr. K. Hyatt of the British Museum, 
Natural History for their hospitality while visiting their institutions. 
A. Riedel and J. Pro'szynski of the Polish Academy of Sciences, W ar- 
saw (PAS) ; Dr. L. Brundin, Riksmuseum, Stockholm, Mr. T. 
Yaginuma, Osaka, and Dr. J. V. Scorza, Caracas loaned valuable 
specimens. A National Science Foundation grant (G-4317) made 
possible a trip to Europe to examine types and the National Institute 
of Health grant (E-1944) facilitated completion of the study and 
publication of the manuscript. 
Chrysso O. P. -Cambridge 
Chrysso O. P.-Cambridge, 1882, Proc. Zool. Soc. London, p. 429. Type species 
by original designation Chrysso alhomaculata O. P.-Cambridge. 
Meotipa Simon, 1892, Histoire Naturelles des Araignees, 1: 519. Type species 
by original designation Meotipa picturata Simon. 
Physcoa Thorell, 1895, Descriptive Catalog of the Spiders of Burma, p. 83. 
Type species by original designation Physcoa scintillans Thorell. 
Argyria Yaginuma, 1957, Acta Arachnologica, 15: 11. Type species by origin- 
al designation Argyria venusta Yaginuma. Homonym of Argyr.a Hueb- 
ner, 1818, and Argyria Robineau-Desvoidy, 1863. 
Argyroaster Yaginuma, 1958, Acta Arachnologica, 15: 37. New name for 
Argyria Yaginuma preoccupied. 
Arctachaea Levi, 1958, Psyche, 64: 102. Type species by original designation 
Arctachaea pelyx Levi. 
Diagnosis. Chrysso differs from Theridion by a hump or posterior 
dorsal extension of the abdomen ; from A chaearanea by having a much 
more complicated palpus containing a radix; from Argyrodes and 
Spintharus by lacking a colulus (Levi and Levi, 1962) . 
Comments. 1 he types of Chrysso nigriceps Keyserling and Helvibis 
sulcata Keyserling have been examined since publishing my paper in 
