1945] Two New Forms of Monomorium 65 
Ella Virginia Gregg, in a pine-palmetto woodland. The nest 
was indicated by a crater in a rather sandy patch of soil. Upon 
excavation to obtain the colony, a great deal of porous limestone 
was encountered, and many of the ants were distributed through 
the interstices of the rock. My wife’s attention was attracted 
by the ever increasing number of dealated females which issued 
from the crevices, but her efforts to continue digging met with 
much difficulty. Although over 60 queens were secured, we are 
certain many more were beyond our reach. A heavy shower put 
an end to operations and we were unable to return to the site to 
ascertain the extent of the colony. Monomorium is known at 
times to have many queens, and occasions such as this case 
probably indicate the adoption of recently dealated females 
either of the same or adjacent nests. 
The worker of peninsulatum differs from that of minimum in 
the following respects: the petiolar node is noticeably larger 
and higher, and its anterior face is more vertical so that the 
peduncle appears more distinct; the mesopleurse and sides of 
the epinotum have delicate rugulations unlike those parts in 
minimum which are smooth and shining; the coloration is a 
deeper black, with bluish, metallic reflections in certain lights, 
and the clypeal teeth are slightly further apart. 
The peninsulatum female may be distinguished by the fact 
that it is of larger size ( minimum being about 4 mm.), the ocelli 
are much larger and more prominent, the clypeal teeth are 
blunter and a little more widely separated, and the whole body 
appears quite shining though the sculpturing is more pro- 
nounced. Punctures are deep and numerous on the head and 
thorax, and obvious, coarse rugae cover the entire epinotum 
(present on minimum only at the extreme ventral aspect of the 
declivity). Petiole and postpetiole are more quadrate and an- 
gular, and the superior face of the former is depressed into a 
wide, shallow notch. Peduncle is more pronounced and has a 
ventral ridge and tooth which are almost absent in minimum. 
Hairs are coarser and more abundant. Color of much of the 
head and thorax is yellowish or reddish brown, and the gaster 
is of a dark, bluish black that is more noticeable than in the 
worker, the entire ant contrasting strongly with the queen of 
minimum which has a uniformly brownish black body. 
Notwithstanding the fact that the worker of this species and 
that of M. minimum are very similar, they still can be separated 
