248 INSECTA. 
usually have a very large head, almost square, when viewed from 
above, and their antenne frequently largest at the extremity or cla- 
vate, have an abdomen either oval or elliptical, and widest in the 
middle, or narrowed at base into an elongated pedicle, and as if ter- 
minated by a club. 
In some, the antennz are inserted below the middle of the anterior 
face of the head; the clypeus is short and wide. 
Sometimes the eyes are emarginated. 
Trypoxyion, Lat., Fab.—Arius, Jur.—SpuHex, Lin., 
Where the mandibles are arcuated and dentated. The superior 
wings have but two closed cubital cells, each receiving a recurrent 
nervure; the second cell is small and less distinctly marked, as svell 
as a third, that which is incomplete and almost reaches the tip of the 
wing. The abdomen is narrowed at base into a long pedicle. 
T. fiqulus; Sphew figulus, L.; Jur., Hymenop., TX, 6—8. 
Black and glossy; the clypeus covered with a silvery, silken 
down. The female takes advantage of the holes excavated in 
old wood by other Insects, and deposits her eggs there, along 
with the little spiders destined to nourish her larve. This done, 
she closes the orifice with moist earth *. 
Sometimes the eyes are entire. 
Here, the mandibles are narrow and merely dentated at the extre- 
mity, or terminate in a simple point, with a single tooth beneath or 
on the inner side. ‘The antennze are approximated at base. 
Gorytets Lat.—Arpactus, Jur.—MeE.unus, Oxyseuus, Fab., 
Where there are three complete, sessile and almost equal cubital cells, 
of which the second receives the two recurrent nervures. The man- 
dibles are moderate and unidentated on the inner side; the antennz 
are rather thickest near the extremity. ‘The metathorax presents a 
kind of false, sulcated or waived scutellum. The anterior tarsi are 
frequently ciliated, and have the last joint inflated f. In 
Crasro, Fab., 
There is but a single closed cubital cell, and it receives the first re- 
current nervure; the mandibles terminate in a bifid point. The 
antenne are geniculate and filiform, fusiform or slightly serrated in 
some. Their palpi are short and almost equal; the ligula is entire. 
The clypeus is frequently golden or silvery, and very brilliant. 
Some males are remarkable for the palette or trowel-like dilatation — 
(even resembling a sieve) of the tibia, or of the first joint of their 
anterior feet. 
The female of one species—czbariws—provisions her larvae with a 
Pyralis that lives on the Oak. Those of others feed them with Dip- 
tera, which they amass in the holes where they lay their eggs t. 
Stiemus, Jur., 
These Insects are thus named from the largeness of the thick or 
* Lat., Gen. Crust. et Insect., IV, 75. 
+ Lat., Ibid., 88. 
t Lat., Ibid., 80. 
