376 PROCEEDINGS OF THE ACADEMY OF [May, 



and that outside of these species the tropical element is very weak, 

 equalling but 11.3% of the non-introduced species, and only found 

 in the scrub of the keys and the limited areas of jungle-like "ham- 

 mock" land on the southernmost portion of the Florida peninsula, 

 distinguished particularly by the presence of the gumbo limbo 

 (Bursera simarubra). Of these species the genus Mantoida is tropical 

 American, while Oligacanthopus is known only from a single specimen 

 from Miami, Fla. All of the other species are West Indian, Plec- 

 toptera poeyi, Stilp7iochlora marginella, and Cyrtoxipha gundlachi 

 being found elsewhere in tropical America as well. One species, 

 Paratettix toltecus (Sauss.), taken at Homestead, Fla., only, alone 

 represents a purely Sonoran and Mexican form. 



The following species are tropical intruders in the Lower Austral 

 zone of the southeastern United States which are found in the region 

 under discussion: 



Anisolabis annulipes (H. Lucas). Pycnoscehis surinamensis (Linn.). 

 Periplaneta australaske (Fabr.). *Scapteriscus abbreviatus Sc. 

 Periplaneta brunnea (Burm.). *Cryptoptilumantillarum (Redt.). 



The species preceded by an asterisk again appear to be the only 

 forms in this list which have not been accidentally introduced by 

 man. The species Pycnoscelus surinamensis shows, however, very 

 long residence in this region by its widespread abundance. 



Pine trees are found only on Big Pine and the adjacent keys, and 

 in the undergrowth of these forests three species, Radinotatum 

 hrevipenne peninsulare, Schistocerca damnifica calidior, and Aptenopedes 

 aptera, were found, which species were not present elsewhere on the 

 keys. In this situation the resemblance of specimens of a number 

 of species to mainland individuals of the same was closer than to 

 those taken in the keys scrub, the latter series as a rule differing in 



paler coloration. 



FORFICULID^. 

 Anisolabis annulipes (H. Lucas). 



Homestead, Fla., July 10, 1912; 1 9 . 



Key West, Fla., July 5, 7, 1912; 3 c^, 2 9 . 



The femoral annuli are prominent in all of these specimens, one 

 female from Key West having these markings particularly heavy. 



The specimen from Homestead was taken from under a board in a 

 yard. The series from Key West was taken chiefly from under 

 coquina boulders about the East Martello tower, while one specimen 

 was captured between boards in the wood shed where Blaberus 

 atropos was found numerous. 



