1915.] Leng, List of the Carabide of Florida. 557 
half occur also in Cuba, and one rather feeble variety occurs also in Yuca- 
tan. Many of the forms comprising the ten per cent. peculiar to Florida 
might be considered as merely varieties of northern species; the following 
are however remarkably distinct species, viz:-Cicindela striga,- Euproctus 
trivittata, Onota floridana, Chlenius maxillosus, Lebia lecta. Their existence, 
and that of a few species which may have spread from Florida into adjoin- 
ing states in recent times, might be explained by the assumption of ancient 
coral islets where southern Florida now stands which have, since become 
joined to the American mainland by an advancing peninsula of coral, shell- 
rock and sand, bringing with it an insect population that could so over- 
whelm the scanty fauna of such an islet that only a feeble remnant would 
be traceable. That the great bulk of Florida Carabide are identical with 
those of the rest of the United States may be shown as follows: 284! species 
and varieties of Carabide are enumerated, of which 31 are not found else- 
where in the United States, and 71 more are found only in the extreme south- 
ern states, Georgia, Alabama, Louisiana and Texas. In other words, over 
one third of the species are new to the collector from the northern States, 
and it is this fact that has made the fauna so interesting. There remain 
182 species known from the regions north and northwest of Florida, some 
extending to District of Columbia, others to New York, and a few even to 
Canada. Of these some are northern species whose southern limit of 
distribution is reached in Florida, but most are Sonoran species whose range 
extends variously northward. : 
The relation with Cuba is evidenced by the following cases of specific 
identity: Calosoma splendidum, a Cuban species found only occasionally at 
Key West; Tetracha carolina, a member of a tribe greatly developed in the 
tropics, which has a range northward to Washington, D. C.; Crcindela 
marginata, a species of marshy shores, from Cuba to Maine, along the Atlan- 
tic Coast; Cicindela trifasciata, a species of similar shore habits, occurring 
all around the Gulf of Mexico and in several West Indian islands, extending 
in the United States northward possibly to North Carolina;” Bembidiwm 
affine, a member of a difficult group taxonomically; Morto montlicornis, 
found under bark of dead pines in Cuba, Florida and north to North Caro- 
lina; Chlenius perplexus, a tropical species found in moist shore situations 
in Cuba, Florida and Central America; Chlenius niger, a species of similar 
habit found from Newfoundland to Florida, Cuba and Louisiana, perhaps 
1 This number may be compared with 304 recorded from. District of Columbia, 357 
from New Jersey, and 366 from Indiana, to indicate the comparative scarcity of the Carabide 
in Florida, especially in the genera Bembidium, Platynus, Pterostichus, Amara and Harpalus,. 
so fully represented in Transition regions. The comparison may be made with the additional 
condition of the smaller area included in each case in mind; an area equal to that of Florida 
surrounding the District of Columbia would doubtless yield more than 304 species. 
