Breeding schedule.—Twenty-one records of breeding span the period March 11 to June 10 ([Fig. 6]); the modal date for egg-laying is March 25. The histogram ([Fig. 6]) is constructed on a clearly inadequate sample, and records of breeding both earlier and later are to be expected. The peak of first nesting activity is probably reasonably well-indicated by the available records.
Number of eggs.—Clutch-size is 3 eggs (3.6, 3-5; 16).
Nests are placed on the ground, usually amid short vegetation such as cropped prairie grassland or cultivated fields (notably soybeans and wheat), and occasionally on bare ground.
Table 14.—Occurrence in Time of Summer Resident Swallows in Kansas
| Species | Arrival | Departure | ||
| Range | Median | Range | Median | |
| Tree Swallow | Apr. 5-Apr. 30 | Apr. 24 | Sept. 30-Oct. 21 | Oct. 8 |
| Bank Swallow | Apr. 9-May 19 | May 7 | Sept. 3-Sept. 20 | Sept. 10 |
| Rough-winged Swallow | Mar. 29-May 30 | Apr. 22 | Sept. 23-Oct. 21 | Oct. 10 |
| Cliff Swallow | Apr. 14-May 27 | May 11 | Sept. 3-Oct. 25 | Sept. 11 |
| Barn Swallow | Mar. 31-Apr. 29 | Apr. 21 | Sept. 22-Oct. 25 | Oct. 7 |
| Purple Martin | Mar. 5-Apr. 9 | Mar. 26 | Aug. 28-Sept. 23 | Sept. 3 |
Tree Swallow: Iridoprocne bicolor (Vieillot).—This is a summer resident in extreme northeastern Kansas; nesting birds have been found only along the Missouri River in Doniphan County. Habitat is in open woodland, and in Kansas is always associated with water. Temporal occurrence in the State is indicated in [Table 14].
Breeding schedule.—Eight records of breeding span the period May 21 to June 20; the modal date for egg-laying is May 25. The small sample may not accurately reflect the peak of nesting activity.
Number of eggs.—Clutch-size is 5 or 6 eggs (5.5, 5-6; 4).
Nests are placed chiefly in abandoned woodpecker diggings in willows, four to ten feet high, over water.
Bank Swallow: Riparia riparia riparia (Linnaeus).—This summer resident is common wherever cut-banks suitable for nesting activities allow relatively undisturbed behavior. The species is almost always found near water. Temporal occurrence is indicated in [Table 14].