448 PRiOCEE.BmGS OF THE NATIOISTAL MUSEUM vol. 94 



is more pointed and has fewer teeth in the holotype of schwarzi and 

 is broadly rounded with many more teeth in the holotype of venosa; 

 in the figure of the latter structure (fig. 76) the cercus is foreshortened. 

 The shape of the right tergal process (10 IlPi) is probably similar in 

 the two specimens. That of the holotype of schwarzi (Ross, 1940b, 

 fig. 24) is curved downward and inward (probably the true position) 

 and thus presents a different appearance. A detail not noted in the 

 description of scJnoarzi is that the terminal half of 10 LP is peculiarly 

 roughened with hairlike projections of the derm as figured; this is 

 evident also in the venosa holotype. 



Subgenus Bulbocerca Ross 

 Bulboeerca Ross, 1940b, p. 654. 



ANISEMBIA (BULBOCERCA) SINI Chamberlin 



AnisemUa sini Chamberlin, 1023, p. 346, figs, a-b.— Davis, 1940d, p. 532, fig. 19. 

 Anisemhia {Bidhocerca) si7ii (Chamberlin) Ross, 1940b, p. 654, figs. 32-34. 



HolotT/pe. — Apterous male, on slide (No. 1245) , and allotype female, 

 on slide (No. 1246), California Academy of Sciences. 



Type data. — Loreto, Baja California, Mexico. 



Distribution. — Central Baja California, Mexico (supported by many 

 records), and islands of Gulf of California (by occurrence of silk 

 tunnels). 



Genus CHELICERCA Ross 



Chelicerca Ross, 1940b, p. 056 (subgenus of Anisemhia Krauss). 



Males. — ^Winged or apterous. Head dark, eyes small to large, oc- 

 cipital foramen rounded anteriorly. Terminalia with cleft of tenth 

 tergite complete to base, right margin irregular, often excised; left 

 tergal process (10 L) complex, outer apical margin twisted ventrad; 

 right hemitergite (10 R) large, often terminated caudad in one 

 or more talonlike hooks curved to right; process of hypandrium 

 (HP) broad, complex apically, often armed with echinulations or 

 nodules; left cercus usually one-segmented (except in one species); 

 ba-sal segment of right cercus somewhat laterally compressed, ex- 

 panded basad, its basal foramen irregular, complex. 



Genotype. — Aniserribia {Chelicerca) clavisi Ross, by original 

 designation. 



Distribution. — Mexico, Southwestern United States. 



In this genus are found some of the most specialized species of 

 the family. The discovery of dampfi from Chiapas, Mexico, with 

 its two-segmented left cercus, gives cause for separating this series 

 of species from that of the genus Anisembia. The terminalia of 

 damqj-fi are nearly as complex as in davisi in spite of the more primi- 



