PROSOPIS. 
195 
not be extant in a parasite. In Colletes it is the con¬ 
comitant of as ample a power of collecting pollen as any 
that we find exhibited throughout the whole range of 
our native bees, but in Prosopis it is concurrent with a 
total deficiency of the ordinary apparatus employed for 
that purpose. 
One of the species of this genus has been found near 
Bristol, with the indication of a Sty/ops having escaped 
from it, which is a further extension of the parasitism 
of that most extraordinary genus, but the Stylops fre¬ 
quenting it has not yet been discovered, which would 
doubtless present a new species, therefore an interesting 
addition to the series already known. 
These insects are not at all uncommon in some of the 
species during the latter spring and summer months, 
valid they frequent the several Resedas , being very fond 
of Mignonette. They are also found upon the Draco - 
cephalum Moldavica, and occur not unfrequently upon the 
Onion, which in blossom is the resort of many interest¬ 
ing insects. The majority of them emit when captured, 
and if held within the fingers, a very pungent citron 
odour, exceedingly refreshing on a hot day, in intense 
sunshine. Some of the species are rare, especially those 
very highly coloured, as is also the P. dilatata, so named 
from the peculiar triangular expansion of the basal joint 
of the antenme, the female of which is not known or 
possibly has only been overlooked or not identified. 
The P. varipes and P. variegata , which are the most 
richly coloured, occur in the west of England, and 
in one, the P. cornuta , the ciypeus is furnished with a 
tubercle. 
o 
2 
