308 Trans. Acad. Sci. of St. Lows. 
Nesting begins early in May and when the young are out the 
birds begin flocking to common roosts in the bottoms. They 
leave on the southern journey during early September. 
Martins are sociable birds and breed in colonies wherever 
suitable bird-houses are provided or where they are able to find 
room in the cornices of old business buildings, as on north 
Main Street and elsewhere in the city. 
To attract a colony of Martins it is necessary to provide a 
house of several rooms with the entrance holes at the bottom 
and placed as high from the ground as possible. It is also 
necessary to have the house out in the open away from trees. 
PETROCHELIDON LUNIFRONS LUNIFRONS (Say). 
PETROCHELIDON ALBIFRONS ALBIFRONS (Rafinesque). Proposed 
April, 1917. Cliff Swallow. 
Not uncommon migrant; very rare summer resident. 
For twenty years prior to 1917 no Cliff Swallows were known 
to breed in Jackson County. During that summer a colony of 
about a dozen pairs remained to breed in the neighborhood of 
Atherton. There are a few colonies in the adjoining counties 
on the east and north. 
During migration they are regularly seen in small numbers 
hawking for insects over ponds with other swallows. 
They arrive in late April and leave in early September. 
HirRUNDO ERYTHROGASTRA Boddaert. Barn Swallow. 
Abundant migrant and not uncommon summer resident. 
The Barn Swallow arrives from the 13th to 20th of April and 
departs during the last half of September. 
It is found in all parts of the county except close to the city. 
It builds in farm outbuildings, attaching its mud and straw 
nest to rafters, beams and walls. 
Hosts of these and other swallows are to be found in the Mis- 
sourl bottoms during migration where they find congenial roost- 
ing and feeding places. Numbers of swallows are also to be 
found over the Swope Park lakes during May and September. 
IRIDOPROCNE BICOLOR (Vieillot). Tree Swallow. 
Very common migrant. 
During the second half of April and early May, and in Sep- 
tember and October the White-bellied Swallow is abundant. 
