iio8 The American Naturalist. 
lives three years in the stems oi Alnus incana and unmistakable proof 
that the segerian which bores the pine tree has a similar period. 
The number of North American species known to science has been 
remarkably increased of late. Of the one hundred and forty species, 
more or less. Mr. Henry Edwards has described a large majority 
during the last decade. Other species were made known by Harris, 
Walker, Westwood, Grote, and other well known specialists. The 
life history of comparatively few of these species is known. Dr. Har- 
ris, who did so much as a pioneer of American entomology, especially 
for its practical or economic application, published the first accounts 
of the natural history of these beautiful and destructive forms. Since 
his publications the details in the life of several others have been made 
known. 
EXPLANATION OF PLATE XLIIL 
The drawings from which the engravings were made were prepared by 
Miss Freda Detmers, of the Division of Entomology and Botany of the 
Ohio Agricultural Experiment Station. All the figures are twice natural size. 
Fig. I. Peach Tree Borer, Sannina exitiosa, male. 
Fig. 2. Peach Tree Borer, Sannina exitiosa, female. 
Fig. 3. Pear Tree Borer, ^geria pyri, male. 
Fig. 4. Imported Currant Borer, jEgeria tipulifortnis , male. 
Fig. 5- Maple Tree Borer, jEgeria acerni, female. 
Fig. 6. ALgeria lustrans, male. 
Fig. 7. Plum Tree Borer, JEgeria pictipes, male. 
Entomological News. — Mr. Wm. H. Ashmead is engaged upon 
a monograph of the Braconidae of North America, which he hopes to 
complete before starting on a proposed trip to Europe. In a recent 
letter he states that he has recognized in the material on hand all the 
Forsterian genera of the subfamily Microgastrina, and has three dis- 
tinct species of the genus Mirax. . . . Mr. E. A. Schwarz has dis- 
tributed his recent address as president of the Entomological Society 
of Washington. It is entitled '' On the Coleoptera common to North 
America and other Countries." "The simultaneous occurrence of 
identical species in regions separated by wide stretches of ocean, or 
other great natural boundaries, can only be explained, ist, by Natural 
Dispersion; or, 2A,hy \}aQ Agency of Man. The author further divides 
the subject by including under the first heading " a, The circumpolar 
fauna ; b. Species not belonging to the circumpolar fauna, probably of 
intratropical origin, which have spread into the temperate zone ; c, 
Migratory species ;" and under the second heading including *' d. In- 
