Two New Species of Collembola from the Mountains 

 of Southern CaHfornia 



GEKTKXTDE BACON 



Beeause of several slight Imt constant ditferences between 

 these newly diseo\'ered forms and the widely distributed 

 Aphorura anibuhins, it seemed best to describe new species on 

 the basis of these characters. AmbulcDis has two ocelliform 

 punctures at the base of each antenna ; there is only one in the 

 new species. Also the post antenna 1 organ of (Diibulaus con- 

 sists of 12-14 tubercles, while these new species have but 11 

 and 9. There are numerous tubercles on one of the joints of 

 the antenna in the new forms which are not like anything in 

 (uiibiildiis. There are a number of other minor differences. 



These new species were found at Bear Flats on the slope of 

 Mount San Antonio, at (5,000 feet elevation. It was tirst noticed 

 that a number of Jiirds were hovering near and occasionally 

 digging in the earth about the bases of the bushes. The soil at 

 this i)lace was very dark and rich in vegetable remains. 

 Although it was several feet down to water, the bushes were in 

 a slight hollow and the earth was a little moist, although it was 

 very dry all about. There were thousands of the insects, 

 usually in little groups and of various sizes. Two kinds were 

 found — a white and a yellow. The yellow was much more 

 al)undant. The little creatures were without eyes but the 

 antennae were actively moved al)out as the animals changed 

 their positions when they were disturbed. Their movements, 

 although slow because of the short legs, were fairly active. All 

 sizes of both the white and yellow were taken to the laboratory 

 and kept alive for several weeks. 



So far this little area on the mountain side is the only place 

 in the mountains or in the canyons where Dr. Hilton or I have 

 found these insects. 



