108 
Psyche 
[April 
pollinate them. Sometimes the oligolege is of no particular use 
to the flower, so that the relation is quite one-sided. Usually the 
blooming season of a plant may be explained by the simple 
statement that it agrees with its relatives, all of which bloom 
about the same time. 
The same statement, however, is true of the oligoleges. 
They resemble their relatives in time even more than the plants 
on which they depend. Evidently the groups to which the 
oligoleges belong were originally quite definitely located pheno- 
logically so that their members were in close competition, to 
avoid which there arose a diversification of food habits, some of 
the species becoming oligolectic and the others remaining poly- 
lectic. In some groups, however, the phenologically correlated 
relatives were oligoleges of related plants, like Melissodes and 
Compositse. Here the diversification in food habits resulted in some 
of the species becoming polylectic. The food habits have evident- 
ly tended to restrict the oligoleges to the time of their food plants 
and to give the polyleges more latitude in the extension of the 
time. Consequently the flight of the oligoleges averages shorter 
than that of their related polyleges. 
Inquilines. — The inquiline bees are phenologically associated 
with their hosts and have no direct relation to flowers. They 
visit the flowers most convenient to them. The Nomadidse, 
inquilines of Andrenidse, show evidences of having shortened 
their proboscides to suit the kinds of flowers which were most 
common where they were flying. Although they are long- 
tongued bees, their flower visits resemble those of their short- 
tongued hosts almost exactly. . 
Coelioxys consists of inquilines of Megachilini and the 
seasons are similar. Psithyrus, an inquiline of Bomhus, has a 
similar flight. 
The Sphecodinse are evidently inquilines of other Halictidse. 
With the exception of Proteraner, they resemble the other Halic- 
tidse in the fact that the females appear first and the males later 
and that they fly all season. The same applies to Paralictus 
which evidently consists of inquilines of Chloralictus. 
