862 THE AMERICAN NATURALIST. [Vor. XXXV. 
among those of a more serious nature may be mentioned the repro- 
duction (pp. 343, 344) of Scudder's original notation attributing a 
day song and a night song to Oecanthus niveus. ‘These supposed 
“day” and * night" songs have long been known to be the songs 
of distinct species, and so far back as 1893 Scudder recognized his 
error and stated that a revision of his score was desirable. 
The plates are all original; most of the text-figures have been 
previously used and the source is acknowledged, though not in all 
cases satisfactorily. 
Very few of the illustrations, either in the plates or in the text, can 
be commended; this can be clearly seen by comparing the colored 
plates with those of Holland's Butterfly Book, and the text-figures 
with those from the same blocks as used in various publications of 
the United States Department of Agriculture and elsewhere; in the 
make-up of the book the plates are poorly placed. 
Inconsistencies in typography and lack of ordinary care in proof- 
reading are so apparent that even an inexpert corrector of the press 
could not turn many pages without finding glaring errors. — S, H. 
Michaelsen's Oligocheta.!— When Dr. Michaelsen began his 
work he had before him no easy task, and it is safe to say that no 
student of this class of animals could have discharged his duty in 4 
more satisfactory manner. The museum in Hamburg is in possession 
of the largest, and as regards species most complete, collection of 
Oligochzta, and when we remember that it has been brought 
together entirely by Dr. Michaelsen, it may be readily understood 
that the author has been eminently fitted for his work. The litera- 
ture of this class of animals is already very large, and it is also so 
scattered that it is impossible for any one living outside of the large 
literary and scientific centers of Europe to procure or have access to 
all. Dr. Michaelsen has had access to all this literature, and has 
personally examined almost every species described by different 
_ authors, as far as they yet exist, and the result has been a work 
the very highest value, and one which no student of the group Ca^ 
do without. 
The first part of the book contains a list of abbreviations for 
reference to literature. It seems to the reviewer that it would have 
been better if such abbreviations had been adopted as are used T 
the publications abbreviated. This suggestion refers equally t9 . 
| Michaelsen, W. Das. ZYerreich. 10. Lieferung, Vermes, Oligocheta. + "i 
Friedlaender, 1900. xxix + 575 pp» 13 figs. x 
