1912.] NATURAL SCIENCES OF PHILADELPHIA. 237 



The specimens from Long Key were all found on the wet ground 

 under heads of prostrate cocoanut palms which had been saturated 

 with salt water and were thoroughly decayed. These specimens 

 when captured possessed an exceedingly disagreeable odor suggestive 

 of decomposition. One specimen at Key West was taken from under 

 boards in a vacant field where most of the specimens of Anisolabis 

 annulipes were found, but the others of the series were all taken 

 from under coquina boulders scattered along the beach just above 

 the usual high-water mark. It is among these boulders about half 

 way up the beach that the beach plant, Borrichia fontescens, grows 

 abundantly. In this situation Anisolabis maritima was exceedingly 

 plentiful, and when disturbed individuals of a colony were seen to 

 run about with abdomen curved upward and forceps wide open, 

 ready to administer a vigorous pinch. 



Labidura bidens (Olivier). 



Key West, Fla., March 15, 16, 1910; 13 <? , 9 9 , 1 9 n: November 

 21, 1911 (Englehardt) ; 1 & [B. I.]. 



We use Olivier's name in conformity with our previous papers, 

 although we are by no means convinced of the specific distinction of 

 Floridian and West Indian specimens from true Labidura riparia. 

 Burr 1 has tentatively allowed bidens to have a place in his " forms" 

 of the riparia group. This species was found in the same beach 

 environment as the last, usually in twos and threes, and individuals 

 were exceedingly repulsive owing to the fact that they emitted an 

 odor suggesting carrion, but even more nauseating. This odor 

 seemed not to originate from an ejected secretion, but from the oily 

 surface of the body. The great forceps of this species are exceedingly 

 weak compared with those of Anisolabis maritima, although indi- 

 viduals made themselves appear very formidable when molested. 

 Labia curvicauda (Motsch). 



Long Key, Fla., March 13, 17, 1910; 50 a", 78 9,4 n. 



This species, which has never before been recorded from the 

 United States, was found in numbers in the dying tops of cocoanut 

 palms at the white base of the fronds where these were moist. None 

 were ever found at the dry bases of the dead fronds, but when these 

 were torn off, the living, hard, white base of each underlying frond, 

 already dead and dry except at that point, would usually expose 

 several specimens. Sometimes several adults would be exposed, 

 sometimes a small colony of very young insects, and once a female 



1 Genera Insectorum, Derm., p. 37. 



