HYMENOPTERA. 151 
rior extremity of the abdomen. The thighs and tibiz are inflated 
or dilated in the male Nomiz. 
The second section of the Anthophila, that of the Arrarta, Lat., 
comprises those species in which the mediate division of the ligula 
is at least as long as the mentum or its tubular shield, and is filiform 
or setaceous. The maxille and labium are much elongated and 
form a sort of proboscis which, when at rest, is geniculate and bent 
under. 
The two first joints of the labial palpi most frequently resemble a 
squamous and compressed seta that embraces the sides of the ligula; 
the two others are very small; the third is generally inserted near 
the exterior extremity of the preceding one which terminates in a 
point. 
The Apiariz either live solitarily or form communities. 
The former never consist of more than the ordinary number of 
individuals, and each female provides singly for her young. The 
posterior legs of their females are neither furnished with a brush on 
the inner side of the first joint of the tarsi, nor with a particular de- 
pression on the exterior side of their tibiz; this side, as well as the 
same of the first joint of the tarsi, is most commonly and detisely 
covered with hairs. 
A first division of these solitary Bees is composed of those species 
in which the second joint of the posterior tarsi of the females is in- 
serted in the middle of the extremity of the preceding one; the exte- 
rior and terminal angle of the latter does not appear to be dilated 
or to project more than in the interior, in the following subgenera. 
We may also abstract from this group certain species—4ndre- 
noides—which approximate 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 max- 
illary 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. 
Sysrropna, Illig. 
Where the mandibles have one dentation under the point, where 
