346 CAT.TFORNIA ACADEMY OF SCIENCES. 



ent seasons will lune a very dilferent aspect. Those 

 cUneloping in the hot and dry season will be shinino-, and 

 ii pubescent or hair3% will remain so but a short time, 

 while the specimens of the colder or wet seasons will be 

 o]-)aque and retain their pubescence or hair a longer 

 time. Some localities, owing to their climate, will retain 

 one of these variations, as shown in Iphthi)}}its sivnitus., 

 in tin' ilamp and cooler climate of the coast and mountain 

 regions of Oregon and Washington. This species be- 

 comes gradually smoother as it goes south, until near 

 San Bernardino and the hot regions bordering the Mojave 

 Desert it is quite smooth. Lhifortunately, some of the 

 varieties of this have won new names undeservedly. One 

 of the specimens of Edrotes before me has the surface 

 dull and coated with a dirty white efflorescence. In 

 species of other genera observed in nature by myself this 

 seems dependent on seasonal influences also. 



Edrolcs vcntricosiis occurs probably along the entire 

 eastern side of the peninsula, but specimens have been 

 sent from San Jose del Cabo only. 



Stibia PUNCTIC01.EIS Horn. San Jose del Cabo. The 

 only specimen in tiie present collection is somewhat 

 aberrant, having the thorax less narrowed behind and 

 the stride better marked with coarser punctures. 



Stibia oviPiiNNis Horn. San Diego, Cal., and in 

 the peninsula southward of that region. 



Triphaeus perforatus Lee. Cabo San Lucas. 



Triisivtis obtusa n. sp. Sierra Laguna. 



Epitragus pruinosus Horn, Texas, Arizona, south- 

 ern California. San Jose del Cabo. 



Eurymetopon rufipes Esch. California, Arizona. 

 Cabo San Lucas. 



