1920] Dozier: Insects of Florida 327 



The help and advice of Prof. J. R. Watson, who is also carrying 

 on ecological work, has been invaluable. He has also allowed 

 the use of a few of his records, which are duly credited. 



The bulk of the coleoptera determinations has been made 

 by Mr. W. S. Fisher, of the U. S. National Museum, to whom I 

 am especially indebted. Others who have determined material 

 are as follows: W. T. Davis (Orthoptera, Cicadidae and Odo- 

 nata), Dr. Herbert Osborn (Homoptera and Tingidae), A. A. 

 Girault (Chalcid^), Dr. L. O. Howard (Chalcidae), J. J. Davis 

 (Aphididas and Lachnosterna), Z. P. Metcalf (Homoptera), 

 W. S. Blatchey (Coleoptera), J. M. Aldrich (Diptera), C. T. 

 Greene (Forest Diptera), Dr. C. H. T. Townsend (Diptera), 

 Carl Heinrich (Micro-lepidoptera), Wm. BeutenmuUer (Cyni- 

 pidae). Dr. E. P. Felt (Cecidomyidae), Dr. A. D. Hopkins 

 (Scolytidae), A. B. Gahan (Hymenoptera), 

 (Thysanoptera and Macro-lepidoptera), Dr. 

 (Sphecidae), J. A. Hyslop (Elateridae), Dr. 

 (Coleoptera), S. A. Rohwer (Hymenoptera), 

 A. Cobb (Nematodes). 



DEFINITION AND DESCRIPTION OF HAMMOCK. 



The term "hammock" is applied in Florida to the dense 

 hardwood and cabbage-palmetto forests, as distinguished from 

 the open pine lands and cypress swamps. The timber growth 

 of the hammocks is most frequently deciduous or largely so, 

 although the predominating growth may be evergreen. 



The variable soil and drainage conditions give rise to a wide 

 variation of vegetation types. The hammocks around Gaines- 

 ville are of two types, high and low hammocks. 



HIGH HAMMOCK. 



The trees of the high hammocks are tall and straight. In 

 some places the underbrush is sparse, but in others forms a 

 dense entanglement. On the richest spots the trees are nearly 

 all deciduous, the proportion of evergreens increasing with the 

 sandiness of the soil. 



The following is a list of the principal plants observed, 

 giving both the scientific and common names. Those that 

 are evergreens are indicated by heavy type, those that are only 

 partially so by the specific name being in heavy type. 



