SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. 137 



Persea pseudo-caroUnensis, Lesq. ; Alameda County ; Miocene. 

 Persea punctulata, Lesq.; Corral Hollow, Alameda County; 

 Miocene. 



Oreodaphne_ (Mountain Laurel). 

 Oreodaphne heeri, Gaudichauo; Lassen County; Miocene. 

 Oreodaphne Htseaeformis, Lesq. ; Lassen County ; Miocene. 



Cinnamomuni ( Cinnamon) . 

 Ciniiaiiiommn ail'iuc, Lesq.; Corral Hollow, San Joaquin County; 

 Miocene. Also found in Colorado, Wyoming and Europe. 

 Cinnamomum scheuchseri, Heer ; Lassen County; Miocene. Wy- 

 oming and Europe. 

 It will be seen that the species of this exclusively tropical 

 genus of plants are widely distributed, and suggest a warm cli- 

 mate. It includes about fifty living species ranging on both sides 

 of the equator. 



SAPiNDACEAi; (Aceraceae). 



Acer (Maple). 



Acer aequidentatnm, Lesq. ; Chalk Bluffs, Nevada County ; Plio- 

 cene. Found also in Colorado and Greenland.* 



Acer arcticum, Heer; Chalk Bluffs, Nevada County; Forest Cit>, 

 Sierra County; The Bad Lands of Nebraska ; Alaska and 

 the Arctic Zone; Pliocene and Miocene. 



Acer bcndirei, Lesq. ; Monte Cristo Tunnel, Spanish Peak, Plumas 

 County ; Miocene. 



Acer holaiidcri, Lesq. ; Table Mountain, Tuolumne County ; Plio- 

 cene. To be continued. 



HYMENOPTERA OF SOUTHERN CALIFORNIA, II. 



BV T. D. A. COCKEREI.I.. 



Megachile occidentalis, Fox, var. leucotricha, n. var. 



Male. — Length, 14 mm., black, with a rather long, 

 parallel sided abdomen. Head broad, facial quadrangle almost 

 square; checks swollen with white hair, long and dense beneath; 

 vertex broad, shining, with strong well-separated punctures, and 

 rather thinly clothed with erect black hair; face densely clothed 

 with erect white hair, up to the region of the antennae, where it 

 gives way to black; clypeus densely punctured, with a median 

 impunctate band; antennae long and slender, flagellum dull ferru- 

 ginous beneath, last joint scarcely or not enlarged; mandibles 

 massive, sharply pointed, the lower edge produced into a large 



* The fact that fossil plants o f widely different latitudes are found 

 in the same region may be accounted for by the differences of altitude in 

 the same region where the plants grew, and also from the species having 

 "been alternately driven North and South by the climatic changes result- 

 ing from tropical heat and glacial cold. 



