SUNIER: Marine fish-ponds of Batavia. 
285 
Ponds near 
Heemraad. 
Heemraad-Oost. 
Pekulitan . 
Pegantungan. 
Jaagpad. 
Fluit. 
Luar Batang. 
.|24 V 
Date 
.|25 VI ’19 
BH ME) 
.|28 VI 719 
17 VIL’19 
719 
8 IX 719 
.| 29 [IL ’19 
6 V 719 
Salinity 
0.3 og 
10.0 Joo 
12.0 Jog 
14.3 90 
26.8 0/00 
38.7 loo 
Olen 
9.7 °/00 
Number of Ind-\Number of 
lowi 2? per 10 M? 
and per night 
047.5 
289 
269 
142.5 
120 
30 
27 
12% 
nets set out 
mosquito- 
1 
4 
1 
8 
0 
8 
8 
0 
0 
7 
8 
Number of /ud- 
lowi 2° actually 
caught 
518 
289 
2413 
114 
120 
39 
19 
10 
Muara Karang . 
As for the production of rossii, leaving aside the abnormal production 
of 17288 99 per 10 M? in one night, which as discussed before, we 
witnessed on November 15th, 1918 in ponds near Heemraad Oost at a 
salinity of 25 °/oo, the following schedule records the maximum rossii pro- 
duction observed by us in each of the different parts of the Batavia sea- 
fish pond belt: ') 
| Number of rossii Number of Number of rossii 
Ponds near Date Salinity |?? per 10 M? and) mosquito- 99 actually 
per night (nets set out caught 
Jaagpad 24 XI 718] 59.2% | 1466 5 733 
Heemraad Oost.| 12 XII 718} 26.9 %/oo 1037 10 1037 
Pekulitan . 29 XI 718) 40.01/5 784 10 784 
Muara Karang .|13 XII ’18, 46.9 °/o, 564 5 282 
Fluit. LONS AETR on 442 10 442 
Heemraad. | 19 IV 719} 13.1 Joo 201 if 141 
29 III ’19| 11.5 0/60) 7 119 
BUS ARTE ie IL ’19| 26.5 Jog 170 7 119 
Pegantungan. | VE NEO AS Oan 80 8 64 
The greatest production of rossii (apart from that observed at Heemraad 
on November 15th 1918), was consequently more than double the size of 
the greatest production of Jud/owi. 
It is a pity that up to the present, as far as I am aware, no figures 
have been collected in the Netherlands East Indies concerning the magnitude 
of the production of Anophelines by definite breeding places, which might be 
compared with our figures. Only in the work of Sir RONALD Ross, K.C. B. (3?) 
À 1) Neither for rossi nor for ludlowi a maximum production of the ponds near 
Antjol is given here, because in those ponds a set of mosquito-nets was placed once only. 
