xxxiii, '22 j ENTOMOLOGICAL NEWS 197 



Tamala borbonia, or red bay, near Gainesville. The shore hay, 

 T. lift oral is, is a very common tree along the sand ridges on 

 the beach near Daytona and in nearly all cases harbors the 

 thrips. In the so-called oak scrub, in central Florida, is a bay 

 known as T. Jut in His, or scrub bay, and the thrips were taken 

 from it between Orange City and Lake Monroe. Probably 

 the most common bay of the State is the swamp bay, T. 

 pubesccns, which lives around the margin of lakes and along 

 streams and in swampy ground over most of the State. The 

 bay thrips is common on this species in the vicinity of Orlando 

 and is reported by Watson as being found on them near Frost- 

 proof, Florida, and other points on the central ridge of the 

 State. The red bay lives in the higher hammock lands and, 

 as stated above, is also a host of the bay thrips. 



The bay thrips also will live on camphor (Cainphora 

 i amphora}, but it is somewhat doubtful if it will establish 

 itself permanently there. Several generations have been bred 

 on camphor trees under observation at the laboratory, but no 

 instances have been found where bay thrips have colonized 

 themselves on camphor trees naturally. Camphor trees grow- 

 ing close to bay trees infested with thrips were uninjured. The 

 preferred hosts certainly are the bays. Of the four species of 

 Tamala no preference has been observed. 



HISTORY AND HABITS. 

 The length of time required from egg to adult as determined 

 from the average of 50 individuals was 28.3 days. As stated 

 above the egg stage lasted for 6.5 days. The total time for 

 the larval and pupal stages together was 21.8 days as an 

 average. Since there is a preoviposition stage of several days. 

 the period for the maximum generations would be in execs-, 

 of 30 days. The life of the adult thrip often lasts about 60 

 days in confinement but in some cases has exceeded this. There 

 is also a postoviposition stage lasting usually for se\eral days 

 ] -receding death. The bay thrips are not very prolific in number 

 of eggs laid. Ten adults laid an average of 1.06 eggs per day 

 over a period of about 2 months. The greatest number laid 

 on any one day was 4. Many days were passed without any 

 eggs being laid. 



