Embryology. 1037 
Professor Forbes discussed at some length the details of his experi- 
ments, which confirm the conclusions reached in my experiments, 
in an address delivered at a meeting of the Central Illinois Horti- 
cultural Society during last August. (Prairie Farmer, August 11, 
1888.) Professor A. J. Cook, of the Michigan Agricultural Col- 
lege, also announces, in Bulletin No. XX ., Similar results.— 
Clarence M. Weed, Ohio Agricultural Experiment Station. 
SMITR’S MONOGRAPH OF THE SPHINGIDE OF TEMPERATE 
NORTH America.—Parts II. and III. of the current volume of the 
Transactions of the American Entomological Society are devoted to 
a “ Monograph of the Sphingide of Temperate North America,” by 
Mr. John B. Smith. This paper makes a volume of nearly 200 
pages. It appears to be very complete, and very carefully written. 
The synonymy of each species is given ; the adult is fully described, 
and descriptions of the early stages are also given whenever they are 
known. The work abounds in valuable critical notes. Analytical 
keys for the separation of genera and of species are furnished. 
The paper concludes with a synonymical list. Eighty species are 
enumerated in this list. This work should be in the hands of 
every student of American Lepidoptera. 
EMBRYOLOGY. 
DEVELOPMENT OF MELOE.—Josef Nusbaum describes briefly 
(Biol. Centraiblat., VIIL., p. 449-452) the development of the oil 
tle, Meloe. This form is very convenient for embryological 
studies as it breeds well in confinement and lays little piles of eggs, 
all the eggs in a single pile developing synchronously. The 
Segmentation nucleus is central and the cells resulting from the 
entation migrate slowly to the surface, the protoplasm forming 
a reticulum in the meshes of which the yolk is embraced. Some 
of these cells reach the surface to form the blastoderm while others 
remain behind to form “ yolk cells.” On the third day the ventral 
Plate and the rudiments of the amnion appear very early the ventral 
plate becomes segmented, and paired appendages appear on every 
Segment of the body. The primitive groove appears at the same 
time as the amnion and develops from behind forward. It soon 
closes and forms a tube with a very narrow lumen behind, in front 
a solid cellular in-pushing. This is regarded as gastrulation, and 
the portion thus invaginated as ento-mesoderm or primary entoderm, 
‘ Edited by Prof, John A. Ryder, Univ. of Penna., Philadelphia. 
