Graenicher—Andrenine Bees and Entomophilous Flora. 97 
present during a few weeks only. In each species one genera¬ 
tion is produced annually, and the bee appears the following 
season at the time of flight of the respective species. 
It has been pointed out that all of our species of the summer- 
group are oligotropic, and all but one adapted to the Covipositae, 
and in this respect they differ essentially from the species of 
the spring-group. In connection herewith it may be emphasized 
that while the early Umbellif erae, represented especially by the 
genera Thaspium, Taenidia, Heracleum, Angelica and Sanicula 
are very attractive to members of the spring-group of Andren- 
inae, the late Umbellif erae with the genera Cicuta, Slum, Oxy- 
polis and Conioselinum have no relations whatever to the An- 
dreninae of the summer-group. Comas stolon if era has its flow¬ 
ering season in the spring, but some specimens produce flowers 
throughout the summer and as late as the middle of September. 
It is significant that the flowers of this species are visited very 
abundantly by many Andreninae of the spring-group, but that 
after the middle of July a single species has been noticed on the 
flowers, and this is A . multiplicata, the latest species of the 
spring-group, which holds out until the end of July. All of 
these considerations point to the fact that our Andreninae of 
the summer-group, so far as their relations to flowers are con¬ 
cerned have nothing in common with those of the spring-group, 
and they furthermore support the statement, that in our region 
at least, no seasonal forms of Andreninae are produced. 
January 12, 1905. 
References. 
1. E. Loew. Blumenbesuch von Insekten an Freilandpilan- 
zen, Jahrbucb des bofanischen Gartens zu Berlin, III, 1884. 
2. Chas. Robertson. Flowers and insects, XIX, Botanical 
Gazette, XXVIII, p. 27. 
7 
