October, '23] 
MIDDLETON: LONGISTIGMA CARYAE 
447 
Table I.—District or Station of Report, Washington 
(From ‘Weather, Crop and Markets” Pub. weekly by U. S. Dept. Agric.) 
Date of 
Publication 
1922 
Week 
Period of 
Average 
Average 
Temperature (dt) 
Total 
Precipitation (rt) 
Sept. 2 
(Week ending Aug. 29) 
72 (—1) 
0.4 (—0.5) 
“ 9 
( ‘ 
Sept. 5) 
75 (+3)* 
5.5 (+4.8)* 
“ 16 
( ‘ 
“ “ 12) 
76 (+6)* 
1.1 (+0 2)* 
“ 23 
( ‘ 
“ “ 19) 
69 (+1)* 
1.1 (0) 
“ 30 
( ‘ 
“ 26) 
65 (—1) 
0 (—0.8) 
Oct. 7 
( ‘ 
Oct. 3) 
65 (+2)* 
0 (—0.6) 
“ 14 
( ‘ 
“ “ 10) 
72 ( + 11)* 
1.0 (+0.4)* 
“ 21 
( ‘ 
“ 17) 
61 (+3)* 
0.2 (—0.4) 
“ 28 
( ‘ 
“ “ 24) 
53 (—2) 
0.1 (—0.8) 
Nov. 4 
( ' 
“ “ 31) 
52 (0) 
0 (—0.8) 
“ 11 
( ‘ 
“ Nov. 7) 
55 (+5)* 
0.1 (—0.6) 
“ 18 
( ‘ 
“ “ 14) 
53 (+6)* 
0 (—0.6) 
In the above review of the weather the preponderance of plus or excess 
averages (those indicated by the *) are doubtless of especial significance 
in the late activities of the Longistigma. Not only were these apparently 
favorable to the aphid but they probably produced a stimulating effect 
on and an increase of sap in the trees which the previous rather scanty 
rainfall had depressed. 
Bureau of Entomology notes 1 of various years on Longistigma caryae 
Harris contain the following records of occurrence for the species. 
April 30 August 6, 7, 11, 17, 20 and 28 
• May 5 September 4, 5, 9, 9, 14, 17, 17, 21, 27 and 29 
June 9 and 26 October 16 and 25 
July 7 and 24 November 4 
These notes point to a maximum appearance during August and Sep¬ 
tember, and while recording the presence of the aphids as late as Novem¬ 
ber, still show no observations on its production of honeydew on this 
date in the latitude of Washington. 
Clarke 2 records the species in early November of 1906 at Montgomery, 
Alabama, (Latitude 32° 21 ^ N. Longitude 86° 25 / W., Altitude 222) on 
the undersides of limbs of sycamores. The colonies were large and 
honey dew abundant. Townsend 3 observed this aphid abundant on 
western plane trees at Washington in 1888. His note mentions the 
staining of the pavement beneath infested trees both in September and 
October. Davis 4 has recorded L. caryae present during October in 
northern Illinois but does not mention it’s honeydew production at this 
time. Wilson 5 states that at Washington, D. C., he has observed egg- 
^indly furnished by Dr. A. C. Baker. 
2 Clarke, Warren T. Ent. News, Vol. 18, pp. 187-188. 
3 Townsend, T. Insect Life, Vol. 1, No. 6, Dec. 1888, pp. 197-198. 
4 Davis, John J. Jour. Econ. Ent., Vol. 3, p. 413. 
5 Wilson, H. F. Can. Ent., Vol. 41, 1909, p. 385. 
