69 
and as far south as Norfolk, Va., and the strawberry leaf-roller, Pho- 
wopter’s comptana, was extremely abundant here, in Maryland, and else- 
where. Three of the species previously mentioned, however—the 
rhubarb curculio, zebra caterpillar, and plum moth—were not con- 
spicuous by their numbers. 
The raspberry sawfly, Jlonophadnus rubi, was more abundant than 
in the previous year. 
The asparagus beetles, Créoceris asparagi and C. 12-punctata, were 
reported by Professor Johnson to have occasioned some injury in 
Maryland (Bul. 26, p. 81), but the hot spell of July and August prac- 
tically put a stop to injury, as neither beetles nor larve of either 
species were to be found in late August and early September, when the 
plants in several localities were examined. 
ON SPECIES COMMON TO NORTH AND SOUTH. 
It may be well to state briefly that of the seven species previously 
noticed (loc. cit., pp. 57,58) as having been particularly destructive 
about Washington in 1899, and which do not fall into either category 
of north or south as to origin, all were destructive during 1900, 
although in some instances in restricted localities. 
The bean leaf-beetle, Cerotoma trifurcata, did more harm in the East 
than was ever before known. ‘The same is true of the spinach flea- 
beetle, Disonycha xanthomelena. 
One of the most interesting of injurious occurrences of the year 
was that of the variegated cutworm Peridroma saucia, which was 
quite destructive over a wide extent of country, including the Pacific 
coast, where it was particularly troublesome in the State of Washing- 
ton. The infested territory comprised portions of Texas, Missouri, 
Kansas, Maryland, West Virginia, Illinois, Washington, Oregon, and 
northern California, and the crops infested included nearly everything 
that grows in gardens, as well as the foliage and fruit of various 
orchard trees. According to testimony of some of our correspondents, 
this insect assumed the habit of traveling in armies, but was not 
noticed on the march in the daytime. 
ON NATURAL ENEMIES AND THEIR INFLUENCE UPON INSECT REPRO- 
C DUCTION. 
The question of the effects of the abundance of natural enemies 
upon injurious insects is closely related to the effects of weather upon 
them, but the subject is much involved, and we know so little about it 
that it is difficult to generalize with much certainty. This much is 
certain, however, that conditions which would affect injuriously a 
parasite may not necessarily affect a host; predaceous insects are not 
necessarily affected by conditions which would be injurious to either 
