234 
BRITISH BEES. 
male they have extra development by becoming thicker, 
as in Melecta; and in Megachile the terminal joint of 
their antennse is laterally dilated and compressed. In 
scarcely any case are they geniculated at the scape in the 
male, as they are in the female. The other genera with 
clavate antennae have the same structure in both sexes, 
as in Panurgus and Ceratina. Remarkable peculiarities 
in the terminal ventral segment or segments of the male 
may be found most conspicuously developed in Halictus, 
Ccelioxys, Anthidium, Chelostoma, Heriades, Osmia, Apa- 
thus, Bombas, and Apis. In Ccelioxys and Anthidium, and 
some of the Osmice, this sex is further furnished with a 
series of projecting spines, processes, or serrations at the 
apex of the terminal dorsal segment. In Chelostoma, the 
ventral structure of the male is very singular, the apex 
being adapted to a mucro at the base which permits the 
insect to curl up this portion of the body similarly to 
its antennse, the furcated extremity of the abdomen 
fitting, when thus folded, upon the mucro. It is as 
well to draw observation to these peculiarities, which 
give additional interest to the study of the group. 
The genus Eucera appears in May and June. In 
some parts they are found in large colonies; although I 
have seen them abundant I never found them in this 
gregarious condition, and I have usually discovered 
them frequenting loamy and sandy soils; they burrow 
a cell six or eight inches deep, form an oval chamber at 
its extremity, which as well as the sides of the cylinder 
leading to it they make extremely smooth, and by some 
process prevent its absorbing the mixture of honey and 
pollen which they store for the supply of the larva, and 
each contains but one young one. These, having full 
fed, lie in a dormant state throughout the winter and 
