678 A REMARKABLE WASP’S NEST IN MARYLAND. 
In fact Limulus seems to me to be a synthetic or comprehensive 
type, bearing the same relations to the Crustacea that Ceratodus 
does among the fishes, or Archzopteryx among the birds; and be- 
cause Limulus has strong analogies to the Arachnida, we should 
not overlook its true affinities with the Branchiopodous Crustacea. 
-~ Limulus may, then, be regarded as a Crustacean with the cara- 
pace of Apus, bearing simple and compound eyes as in that Phyl- 
lopod, with the antennz foot-like as in many Entomostraca, and 
the abdominal appendages truly crustaceous in their structure, 
while the circulatory system is not fundamentally unlike that of 
other Crustacea, but only more perfect, and the digestive system 
is throughout comparable with that of the normal Crustacea. 
ON A REMARKABLE WASP’S NEST FOUND IN A 
STUMP, IN MARYLAND.* 
BY P. R. UHLER, 
Tue insects of the genus Polistes have not hitherto been reported 
to make nests of clay. All the North American species have 
been considered paper-nest-builders. Many species are known 
from the United States, Canada and the West Indies, and these 
are generally of a brown or yellow color, having spots or bands 
either lighter or darker. 
In the present instance we have a dark brown species with nar- 
row yellow bands across the abdomen, and with yellow feet, which 
builds a nest of clay in the form of a cylinder. In the stump of 
a decayed. Liriodendron, found by O. N. Bryan, Esq., in Charles 
county, Maryland, a number of these insects had aggregated their 
cylinders. The stump was about two feet in diameter and the 
central cavity (which had been formed by the borings of large 
beetles) was five inches wide. In this, attached to the sides, some- 
times lying flat in the grooves left by the beetles, or standing off 
at a considerable angle, and attached by their bases, were thirty- 
three of these peculiar structures. ‘They were of a yellow clay, 
generally about half an inch in diameter, and varying in lengt 
* Read at the Portland Meeting of the Amer. Assoc. Adv. Sci. 
