230 Universitij of California PuUications. [Entomology 



northern portions of the United States and Canada. A number 

 of forms characteristic of the Rocky Mountain region were taken, 

 as well as several found in the hilly back-country of San Diego 

 County, California. However, before any really useful studies 

 on the distribution of the Hemiptera of this portion of the Sierra 

 Nevada can be made, it will be necessary to do systematic collect- 

 ing there during August and early September. It is interesting 

 to note that twenty-one of the species taken, or approximately 

 one-seventh, are new to science, which shows how little is now 

 known of the Hemiptera of the Lake Tahoe region. 



The following notes on localities will indicate the conditions 

 under which most of the material was taken. 



Lower end of Fallen Leaf Lake. — On the west side of the lake 

 from Cathedral Park and the sawmill to the outlet and some dis- 

 tance north was an interesting locality with low, rich woods and 

 open, marshy fields. Mosquitoes were a serious hindrance here 

 but the Hemiptera were more numerous than elsewhere, perhaps 

 because the season was earlier at this altitude, 6300 feet. 



Lateral Moraine. — A sharp ridge along the eastern side of the 

 upper end of Fallen Leaf Lake, with an elevation of about 800 

 feet above the lake. This ridge was well covered with chaparral 

 and until about the tenth of July made an excellent collecting 

 ground for the Hymenoptera, Diptera and Lepidoptera. After 

 that date it became too dry for good collecting. 



Angora Lakes. — Situated under the eastern escarpment of the 

 Angora Ridge at an altitude of about 7500 feet. Collecting here 

 was poor. 



Glen Alpine Springs and Creek are situated in a valley run- 

 ning west from the upper end of Fallen Leaf Lake. Below Glen 

 Alpine Springs the valley is well wooded and afforded excellent 

 collecting places. Toward the last of July the northern side of 

 the valley formed by the southern slope of I\Iount Tallac proved 

 to be one of our best collecting grounds. 



Cathedral Lake, in a valley on the eastern slope of Mount 

 Tallac at an altitude of about 7500 feet, was a moderately pro- 

 ductive place, especially lower down near Floating Island Lake. 



Mount Tallac. — The sloping alpine meadow on the western 

 aspect of the mountain was a wonderfully interesting place from 

 about the twentieth of July. The altitude here varied from about 

 8000 to over 9000 feet. 



