12 
Psyche 
[March 
describes M. trinitatis as being broader than M. pretiosus, 
so M. costaricensis is a more slender beetle than either of 
them. 
Interesting Northern Records for Eastern Hymenop- 
tera (Formicidae and Embolemidae) . — On May 3, 
1952, a mild, sunny day, Dr. W. L. Nutting, Dr. F. G. 
Werner and myself spent an afternoon collecting on Horn 
Pond Hill, near Winchester and Woburn, Massachusetts. 
This glaciated hill, low and largely denuded of its forest 
cover, bears many stones loosely set in the soil and provid- 
ing excellent ant collecting. Under a large stone covering 
a nest of Formica fusca L., Werner discovered foraging 
workers of Smithistruma (W essonistruma) pergandei 
(Emery) ; the nest of this ant was found under an adjoin- 
ing rock. We secured most (perhaps 90%) of the popula- 
tion, which seemed unusually large for a dacetine nest, and 
a count yielded a total of 648 workers and 3 females (defl- 
ate queens). This is the largest population recorded for 
the nest of any dacetine species, and is more than twice 
the usual maximums recorded previously for this and other 
species. Previous northern records for S. pergandei are 
from nearby Boston and Cambridge, only a few miles 
farther south. 
Beneath the rock covering the S. pergandei nest, but to 
one side, were found three workers of Proceratium silaceum 
Roger, of which the northeastern limit has been considered 
to rest in southern New York. 
Under another rock overturned by Werner was found a 
female of the curious embolemid wasp, Embolemus nearcti- 
cus (Brues), previously known from Massachusetts (Stony 
Brook Reservation) and New York. This specimen is very 
similar to the types in the Museum of Comparative Zoology, 
but is darker and more brownish in color. It was found 
crawling on the under side of the rock. It is interesting to 
note that all the records for this insect are dated in May. 
The host is unknown. — W. L. Brown, Jr., Museum of Com- 
parative Zoology, Harvard University. 
