~ HYMENOPTERA. ; 159 
The last of the solitary Apiarie have the first joint of their pos- 
terior tarsi dilated inferiorly on the outer side, so that the following | 
joint is inserted nearer the inner angle of the extremity of the pre- 
ceding one than to the opposite angle. The outer side of this first 
joint, as well as that of the tibiz, is densely crowded with thick hairs 
forming a sort of brush or tuft, particularly in certain species foreign 
to Europe, and thence the term Scopulipedes, which in my Fam. 
Nat. du Régn. Anim., I have given to this last division of the soli- 
tary Apiarie. The under part of their abdomen is naked, or at 
least destitute of a silken brush. The number of cubital cells, with 
the exception of a few species, is three, of which each of the two last 
receives a recurrent nervure. 
Sometimes the maxillary palpi consist of from four to six joints. 
In these, the mandibles exhibit one tooth at most on the inner 
side. They fly with a hum from flower to flower, and with great ra- 
pidity. Several males have a bundle of hairs on the first and last 
joint of the intermediate tarsi. Others are distinguished from their 
females either by their long antenne, or by a more remarkable 
thickening of the two thighs of the second pair of legs, or by that of 
the two last. The anterior extremity of their head is frequently 
coloured with yellow or white. The outer side of the tibiz and of 
the first tarsial joint of the posterior legs, in the females, is often 
densely pilose. They construct their nests either in the ground’ or 
in the cracks and holes in old walls. Several prefer grounds cut 
perpendicularly and exposed tothe sun. The cells, in which they 
deposit their eggs, are formed of earth and shaped like a thimble, or 
those of the Megachiles, and extremely smooth internally. They 
close the opening with the same material. 
Those species, in which the two lateral divisions of the ligula are 
as long as the.labial palpi and setaceous, and where the males have 
long antennz, form the subgenus Lucera proper. M. Spinola, under 
the generic name of Macrocera, has separated from it certain spe- 
cies in which the maxillary palpi have but five distinct joints, and 
the superior wings but two cubital cells. 
The Me issopgs, Lat., are American Eucerz with but four joints 
in their maxillary palpi. They have three cubital cells. 
E. longicornis; Apis longicornis, L.; Panz., Faun. Insect. 
Germ., fascic.; LXIV, 21, the male; LX XVIII, 19, and LXIV, 
16, the female. The male is black; labrum and anterior ex- 
tremity of the head yellow; its superior portion, thorax, and 
spines, the inner one serrated. This subgenus approaches Macrocera and Epi- 
charis. 
