250 INSECTA. 
Other entomologists restrict this generic appellation to those spe- 
cies in which the antennz are remote and abruptly inflated, in which 
the mandibles exhibit no projection on the inner side, and where all 
the cubital cells are sessile. : 
They are the true Philanthi, or 
Puitantuus, Lat.—SmeBLepPuHiwus, Jur. * 
Those, in which the antennze 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 pe- 
tiolate, form the subgenus 
Cerceris, Lat.—PHILANTHUSs, Jur. + 
FAMILY IIT. 
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 antennz are usually geniculate 
and clavate, or thickest at the end. The eyes are emarginated. The 
prothcrax is prolonged behind, on each side, to the margin of the 
wings. In the superior of the latter organs are three or two closed 
eubital cells, the second of which receives the two recurrent ner- 
vures. The body is glabrous or, nearly so, and black, more or less 
maculated with yellow, or fulvous. 
Many of these Insects form temporary communities composed 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 larvae. They are subsequently assisted by 
the neuters. 
We will divide the Diploptera into two tribes. 
The type of the first, that of the Masaripgs, Lat., is the genus 
Masaris, Fab. 
The antenne at the first glance seem to be composed of but eight 
joints, the eighth, with the following ones, forming an almost indis- 
tinctly articulated club, rounded or very obtuse at the end. The 
ligula is terminated by two threads which can be withdrawn into a 
tube formed by its base. There are but two complete cubital cells in 
* Lat., Ibid., 95. The genus Tiachypus, 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. 
+ Lat., Ibid., 93. In the Ann. d’Agricult., LIII., Bose has published some 
abservations on the habits of certain species of this subgenus. 
