26 
No. 3 (Fig. 2). The mine pond at Sunnyside, in the southwest cor- 
ner of Herrin. 
No. 4. A series of woodland pools to the northwest along a railroad 
track, and partially formed by the railroad embankment. ‘This track is a 
feeder to one of the mines and is much frequented by miners, especially 
when going to fish in the ponds of that vicinity. 
No. 5. A woods swamp to the northwest of Herrin, described above. 
No. 6. Mine ponds north of Herrin. The main pond, marked A on 
the map, is used for the boilers and washers, and the other, marked B, is 
a swampy area overgrown with cattails and fed by waste water from 
the 17th St. ditch. 
No. 7. A series of mine ponds to the east of town. 
No. 8. Domestic places, such as tin cans, rain-water barrels, wells, 
and reservoirs. 
Tue Propuction oF Mosgurrors 
Monthly inspections were made at each of the eight series of breed- 
ing places, and a record of the abundance of mosquito wigglers was kept. 
Larvae and pupae were collected and reared to the adult stage in the 
author’s insectary at Carbondale. The species were later determined by 
Dr. C. P. Alexander, of the Natural History Survey. The determinations 
of two species supposedly foreign to this region and one new species 
were corroborated by Dr. Harrison G. Dyar, of the United States Nation- 
al Museum. 
The accompanying table (Kecord of Mosquito-breeding at Herrin, 
1920) shows the monthly abundance of mosquitoes, both Anopheline and 
Culicine, in the eight different breeding places watched during the season. 
It will be noticed that six terms are used in this table to indicate absence 
or grades of abundance, namely, none, very few, few, fair numbers, 
many, and very many. In order to give a numerical value to these rec- 
ords, none is represented by a cipher (0), very few by 1, few by 2, fair 
numbers by 3, many by 4, and very many by 5. These figures are inserted 
in the table at the right of the terms to which they apply, thus making 
it possible to secure totals convenient for purposes of comparison. The 
totals for each month show the relative danger, throughout the season, 
of becoming infected through the bite of the Anopheline mosquitoes ; and 
the totals for each breeding place may be useful in distinguishing the 
types of places which produce the most mosquitoes. The mosquito pro- 
duction is shown move clearly by the following diagram in which the 
breeding-place totals from the table are represented by the heights of 
the columns, the eight columns representing the eight breeding places. 
Both the Anopheline and the Culicine mosquito records are shown on 
the diagram for purposes of comparison. 
