30 BULLETIN OF WISCONSIN NATURAL HISTORY SOCIETY. VOL. 4, NOS. 1-2. 
TABLE I. 
Weight in Grams of Formic Acid Present in Ants of Different Species. 
Mercuric 
chloride. 
Titration. 
Titration. 
Titration. 
Formica fusca. 
var.gnava Bkly. 
worker, 
female. 
.0004960 
.0006342 
. UUUozoO 
*. 0001854 
§.0003986 
Camponotus 
maculatus, 
var sansabeanus 
Bkly. 
worker major, 
worker minor. 
.0005443 
.002150 
. 000448 
.002230 
Camponotus 
fumidus Roger, 
worker major, 
worker minor. 
.0008401 
.001725 
.000414 
.001533 
.000418 
.001744 
*. 000158 §.000368 
Componotus 
americanus. 
Mayr. 
.00009766 
.0002668 
.0002390 
Cremastogaster 
lineolata, 
var.clara Mayr. 
trace 
trace 
Pachycondyla 
harpax. 
.000208 
Forelius 
foetidus. Bkly. 
none 
none 
Atta 
fervens, Say. 
none 
Pheidole 
several spp. 
none 
Pogonomyrmex 
barbatus. Sm. 
none 
Eciton 
spp. 
none 
* These ants were kept for a considerable time in a cloth bag 
in the laboratory. 
§ Collected in very dry weather. 
