140 INSECTA. 
They are the true Philanthi, or 
Puitantuus, Lat.—Simblephilus, Jur.(1) 
Those, in which the antennz are approximated, much longer than 
the head, and gradually enlarge; where the inner side of the mandi- 
bles presents a dentiform projection, and the second cubital cell is 
petiolate, form the subgenus 
Crerceris, Lat.—Philanthus, Jur.(2) 
FAMILY III. 
DIPLOPTERA. 
The third family of the Aculeata is the only one of that 
section, in which with but few exceptions (Ceramius), we 
find the superior wings folded longitudinally. The antenne 
are usually geniculate and clavate, or thickest-at the end. 
The eyes are emarginated. The prothorax is prolonged be- 
hind, on each side, to the origin of the wings. In the supe- 
rior of the latter organs are three or two closed cubital cells, 
the second of which receives the two recurrent nervures. 
The body is glabrous or nearly so, and black, more or less 
maculated with yellow or fulvous. 
Many of these Insects form temporary communities com- 
posed of three sorts of individuals, males, females, and neuters 
or mules. Such of the females as survive the severity of the 
winter commence the nest and take care of the larve. They 
are subsequently assisted by the neuters. 
We will divide the Diploptera into two tribes. 
(1) Lat., Ibid., 95. The genus Trachypus, Kliig, differs but little from this one. 
The first ring of the abdomen is proportionally more elongated, narrower, and 
almost forms a pedicle, as in Psen. 
(2) Lat., Ibid., 93. In the Ann. d’Agricult., LIU., Bosc has published some 
observations on the habits of certain species of this subgenus. 
