13- 
from stems of white clover, in this case the larvie and pup being 
found in the plants August 5 to 10, and adults appearing on the 12th. 
It thus appears that the species is at least two-brooded. 
Laverna gleditschiella. Since this species was reared and described 
by Mr. Chambers, at Covington, Ky., many years ago, it has not since 
been taken by other entomologists elsewhere. From a lot of the thorns 
of the honey locust, collected at Plainville, Ohio, May 14, 1899, and 
sent to Wooster in a cigar box, there emerged in transit several adults 
of this beautiful species. Also, in connection with them, the parasite 
and the minute ant mentioned by Mr. Chambers were both observed, 
and the movements of the former were exactly as represented by hin, 
thus showing the faithfulness of this gentleman’s observations and 
records. 7 
Of the beneficial insects that have been observed in particular abun- 
dance the present year, we may note Podabrus tomentosus, Telephorus 
bilineatus, and Megilla maculata. With the little Smilia misella, from 
which so much help has been expected in holding the San José scale in 
check, the contrary is true. There are not more than half as many of 
these insects as there were a year ago, thus counteracting the effect of 
the winter on the scale itself. 
The president then called Mr. Webster to the chair and presented 
the following: : i 
TEMPERATURE CONTROL OF SCALE INSECTS. 
; By C. L. MartuatTt, lWashington, D. C. 
The fact that climatic conditions play the most important role as a 
controlling factor in the multiplication of scale insects particularly has 
been very strongly impressed on the writer during the last few years. 
In other words, he believes favorable or unfavorable climatic conditions | 
to be of far greater importance in determining the abundance or scarcity 
of scale insects than such other natural checks as parasitic and other 
insect and animal enemies, or even fungous or bacterial diseases. 
The importance of temperature control was especially impressed on 
the writer during an examination of European conditions a year or so 
since, and the conviction was forced upon him that for most of Europe 
climate has more to do with the immunity from scale insects than any 
other agency. The unfavorable features of the climate of middle 
Europe are its shorter and cooler summers and greater moisture and 
consequently less amount of sunshine. Where the conditions named 
do not apply, the immunity is to be explained by the great dryness and 
heat of the summer, which apparently results in the burning up and 
drying out of most scale insects, so that damage from this source is 
insignificant and rare. 
