932 : General Notes. 
siderata of the Herbarium for North America north of Mexico,” 
` including Ranunculacee to Rosacez. We trust that botanists 
will very generally respond to the appeal for specimens. ; 
ENTOMOLOGY. a 
On the Homologies of the Wing-Veins of Insects.—Using 
the conclusions of Adolph? as a starting-point, Redtenbacher? 
has made a very elaborate investigation into the homologies of 
the veins of the wings of insects; and, although his conclusions 
may not be generally accepted, they will be of interest to all 
systematic entomologists. The work treats of each of the orders 
of winged insects, and is illustrated by twelve plates, upon which 
are one hundred and sixty figures of the wings of insects. We 
have space for only a few extracts from the introductory portio 
of the memoir. 
cause a prolongation of the body-wall. 
_ That the wings of insects are equivalent to the trachea 
of the Ephemerid larva can hardly admit of a doubt. 
gills. It is not only possible, but even probable, that tu 
of insécts were originally not active, but merely passivi 
_ of motion, serving, like the pappus of the Composite, for ex 
_ for the floating and spreading of the progeny to a dista i 
— -the essential nature of a rudimentary wing 1s 4 boi 
which is filled with blood-liquid, contains nerves at 
ments, and whose two plates do not grow together un 
