204 
t 
recurrent pulses at approximately monthly intervals. In Plate V. 
I have plotted the seasonal distribution of this species for the years 
1894-99. The plate will serve as one of the best illustrations of 
the nature of the data contained in my statistical records that could 
be chosen from them. It illustrates graphically the character of 
the seasonal distribution of this species and the nature of what I 
have called recurrent pulses. 
In the table which follows, as elsewhere in similar tables, these 
pulses are listed by the number of individuals attained at their 
maxima, and are located according to the dates of these maxima. 
PuLSES OF POLYARTHRA PLATYPTERA. 























































Year Date Temp. No. Date Temp. No. Date Temp. No. 
1895 == rT i 
1896 Jan. 6 32° 5,406 | Feb. 25 34° 7,852 | Mar. 24 41° 57,267 
eS) ooe 2,736 
1897 ——= = —=> ——$—— ||| == Se 
1898 Jan. 25 32° 11,997 Feb. 22 32° 6,318 == 
1899 Jan. 17 33° | 20,800 | Feb. 14 Sis? 145,600 | Mar. 7 335 71,200 
| } | 
Year Date Temp. No. Date Temp. No. Date Temp. No. 
} | 
1895 | Apr. 29 GAO Nhs SOAR 0e | ee 
1896 Apr. 24 (oo 233,436 | May 8 76° 54,365 | June 1 69° 18,000 
eal 73° 35,200 
1897 | Apr. 27 60° 472,000) | ——— == = 
1898 Apr. 26 Sifis 696,000 | May 17 64° 195,200 | June 14 82° | 432,800 
| 
Year Date Temp. No. Date Temp. No. Date Temp. No. 
es 
1894 July 30 82° 1,908 — ————— = 
1895 july 6 | 81° 231,504 | Aug. 1 ¥9OS - 6,350 | Sept. 12 79° 19,272 
seat PK 82° TASS 
1896 July 10 | 980° 90,000 | Aug. 8 86° 39,200 | -—— —_ | —— 
| Pedi 2s 82° 71,000 
1897 July 21 | 81° | 172,000 | Aug. 24 78° 230,400 | Sept. 14 |~ 83° 50,000 
{9384 Aug. 2 78° | 288,000 | Sept.27 | 73° | 238,400 
| es 82° 96,000 








