262 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



characters plus the wide spatial separation led the author to describe this 

 unique as new. 



Bulla simllaris Richards 



1936. Bulla stmilaris Richards, Ann. Ent. Soc. Amer., 29 : 433-434, figs. 



8-9. Type locality: San Benito, Texas. Type: cf, in U.S.N.M. 



1939. Bulla similaris Richards, Ent. Amer., n. s., 19: 70, pi. 5, fig. 13. 



The short type series, after segregation of race californicaj shows a 

 dark form in which the sexes are both maculate. 



Expanse: 33-36 mm. 



Male genitalia: (pi. 32, figs. 4-6) Sacculus with moderate basal 

 lobe of somewhat variable shape, and blunt distal projection. Juxta mod- 

 erate and smoothly rounded. Aedoeagus with moderate proximal spine on 

 vesica and slightly larger distal spine; the dorsal surface near the tip 

 covered with minute spiculations (in addition to spicules on vesica). 



Female genitalia: (pi. 33, fig. 4) Sternite VII with relatively broad 

 short median prong which is only slightly longer than the lateral lobes of 

 the sternite. 



Distribution : Texas, and Baboquivari Mountains, Arizona. Doubt- 

 less also occurs in northern Mexico, but no records are known. 



Bulia similaris race californica Richards 



1939. Bulia similaris californica Richards, Ent. Amer., n. s., 19: 70-71, 

 pi. 5, fig. 14. Type locality: Jacumba, San Diego County, Cali- 

 fornia. Type: ?, in U.S.N.M. 



This is the desert race from the Pacific region. The females tend to be 

 immaculate and light ; the males are also lighter but not so strikingly so. 



Expanse: 33-40 mm. 



Genitalia: as in type form. 



Distribution: Arizona, southern California, and Baja California, 

 Mexico. From Baja California specimens have been seen from Rosarito 

 (2 cT) 1 ?, paratypes), Punta Prieta (2 9, paratypes), and Espiritu Santo 

 Island, March 7, 1937, John S. Garth Coll. (1 cf, Allan Hancock Foun- 

 dation Collection). 



The greatest difficulty in this genus has always been and still is the 

 separation of females of similaris (and californica) from those of deducta. 

 As a rule, the median prong of sternite VII, being relatively short and 



