HYMENOPTERA, 259 
noides—which approximates to those of the last of the preceding 
subgenera in their labial palpi, composed of six slender, linear joints 
placed end to end, and almost precisely similar to those of the maxil- 
lary palpi. The labrum is always short. The abdomen of the fe- 
males is destitute of a brush; but their posterior legs are pilose or 
furnished with tufts of hairs, which enable them to collect the pollen 
of flowers. 
Some have narrow mandibles, contracted near the extremity, and, 
as well as the labrum, smooth and terminated in a point. 
Systropua, I/liq., 
Where the mandibles have one dentation under the point, where 
there are three complete cubital cells, and the extremity of the an- 
tennee is curled in the males *. 
Ropuites, Spin., 
Where the mandibles are also dentated, but in which we find but two 
complete cubital cells; the antennee are not contorted in both sexes f. 
Panureus, Panz., 
Where the mandibles are not dentated. The stem of the antenne, 
from the third joint, in the females, forms a sort of fusiform or elon- 
gated and almost cylindrical club, thinned at base. But two cubital 
cells in the superior wings f. 
The mandibles of the females, in the others, are almost in the form 
of the bowl of a spoon, very obtuse, carinated or sulcated, and biden- 
tated at the extremity. The labrum is extremely hard and ciliated 
superiorly. The antenne are strongly geniculate and filiform. The 
superior wings have three complete cubital cells, the first intersected 
by a little transparent line, the second triangular, and the third the 
largest, and receiving the two recurrent nervures. 
Xyiocopa, Lat. Fab., 
Commonly called Abeilles perce-bois, Menuisiéres, &c. ‘The Xylo- 
cope are related in many points to the Megachiles, and more particu- 
larly to the Osmiz. They resemble large Bombi. Their body is 
usually black, sometimes partially covered with a yellow down; the 
wings are frequently violet, cupreous, or green, and brilliant. The 
male, in several species, differs considerably from the female. Their 
eyes are large and approximated superiorly. Their anterior legs are 
dilated and ciliated. 
X. violacea, L.; Reaum., Insect., VI, v, vi. About one inch in 
length; black, with violet-black wings; a russet ring round the 
antenne ofthe male. The female bores a long vertical hole in 
the body she has selected, usually old dry wood exposed to the 
sun, and parallel to its surface. It is divided into several cells 
by horizontal septa, formed with agglutinated raspings of wood. 
She then, commencing with the lowest, deposits an egg and some 
* Lat.,, Gener. Crust. et Insect., IV, 156. 3 
+ Lat.,, Ibid., 161; andthe Nouv. Dict. d’Hist. Nat. 2nd edit. 
t Lat., Ibid., 157; and Encyc, Méthod., article Panurge. 
