262 INSEOTA. 
Other analogous species attack the leaves of the Oak, Elm, 
&c., for a similar purpose *. 
Lituureus, Lat., 
Where there are four joints in the maxillary palpi, as in the follow- 
ing subgenus, but the abdomen is depressed superiorly. All the 
joints of the labial palpi are placed end to end f, arid the palpi them- 
selves resemble long squamous sete, terminating in a point. The 
mandibles are narrow in both sexes, and their extremity is emar- 
ginated in the middle or bidentated. The females have a rounded 
projection in the middle of their head f. 
Osis, Panz.—AntTuHopHoRA, Fab.—Tracuvsa, Jur., 
Where the maxillary palpi are formed of four joints, or at least of 
three very distinct ones, and the abdomen is convex above. Some 
are masons, and frequently have two or three horns on the clypeus, 
which appear to be of use to them in the construction of their nests. 
They conceal the latter in the ground, holes in walls, doors and old 
wood, and sometimes even in the shells of Helices, employing an 
earthy mortar for their construction. They are generally pilose, and 
appear early in the spring. ‘The antenne of the males are usually 
long. Others employ the petals of flowers, and form cells with the 
cut portions, in the manner of the leaf-cutters. The Abezlle tapis- 
siére of Reaumur forms its cells with the petals of the wild Poppy, 
and sometimes of the Rape §. Others again form their nests in the 
galls of trees |}. 
Anrtuipium, Fab., 
Where the abdomen is also convex; but the maxillary palpi are uni- 
articulated. The females form their nests with the down of plants 4. 
The two last subgenera of the Dasygastre approach the following 
ones in the absence of a silken brush, a fact which would lead us to 
suppose that these Insects are equally parasitical; but their labrum 
is parallelogramical, and their mandibles are triangular and dentated. 
The maxillary palpi are very short and biarticulated. 
Sreuis, Panz. 
The scutellum destitute both of spies and teeth. The abdomen is 
nearly semi-cylindrical, convex above, and curved at the extremity **. 
Cenioxys, Lat., 
Where the scutellum has two teeth or spines, and the abdomen is 
* Lat., Gen. Crust. et Insect., IV, p, 165. 
+ The third joint is usually inserted on the outer side of the second, anterior to its 
point, and with the second forms a little oblique and lateral stem. ; 
+ Centris cornuta, Fab., and an undescribed species from the Isle of France. 
§ This species, with all those in which the mandibles are tridentated, forms the® 
genus ANTHOCOoPA of M. Lepeletier. See Encye. Méthod., article Rophyte. The 
Osmiz, properly so called, have but two teeth in each mandible. 
|| Lat., Gener. Crust. et Insect, IV, 164; and the Encye. Méthod., article Osmie. 
G Lat., Ann. du Mus. d’Hist. Nat., XIII. 
** Lat., Gener, Crust, et Insect., IV, 163. See particularly the Encyc. Méthod., 
article Stélide, 
