674 THE AMERICAN NATURALIST. (VoL. XXXIV. 
750 pages, with 328 cuts and two maps; one of the maps shows the 
locations of the colonies of the San José scale, and the other is the 
1896 relief map of the State Geological Survey. The list proper 
is preceded by short chapters dealing with the development of insects, 
their injuries, insecticides, and machinery. 
According to the summary given on page 701, Professor Smith's 
first list contained 238 families, 2307 genera, and 6098 species ; in 
the volume under consideration 329 families, 3181 genera, and 8537 
species are recorded. The increase in the number of families is 
apparent rather than real, as it is due to a more minute division than 
was deemed advisable in the earlier volume. As instances it may 
be noted that the bees listed in 1890 in two families are now given 
in fourteen, and the sawflies included in the Tenthredinidz in 1890 
are now divided into ten families. 
The list, though a useful and interesting one, would have greater 
scientific value had Professor Smith followed Dr. Calvert's practice, 
in the Odonata, of including only those species of which he had 
seen specimens actually collected in the state, or for which the best 
authority could be cited. The records, * New Jersey probably," 
* should occur in New Jersey," * will probably occur in New Jersey," 
| are frequent, and in some instances such statements include the data 
given for all the species of a family. 
Mating Instinct in Moths. — A. G. Mayer! carried 449 cocoons 
of Callosamia promethea from Cambridge, Mass., to Loggerhead Key, 
off the Florida coast. When the moths emerged they were many 
hundred miles south of the southernmost range of this species. 
Experiments were then made on the way in which the females 
attract the males. Males do not come to females in hermetically 
sealed glass boxes, but they do congregate about boxes which do not 
admit of a sight of the female, but which allow odors from the female 
to escape to the outer air. Males will seek out such boxes even 
when the vapor of carbon bisulphide or of ethyl mercaptan is escap- 
ing from the box, together with such odorous material as the female 
may produce. The sense organs of the males stimulated by these 
substances are the antenna, for when these organs are covered with 
shellac, glue, or other impervious materials, the males no longer seek 
the females. Females thirty to sixty hours old are much more 
attractive to males than young females five to ten hours old. Virgin 
!1 Mayer, A. G. On the Mating Instinct in Moths, Psyche, vol. ix (1900): 
pp. 15-20. 
