204 Trans. Acad. Sci. of St. Louis. 



feeding and gathering at the roosts in the evening, some with 

 the CUff Swallows in the marsh, others with the Martins 

 in the Willows. Migration seems to be well under way by the 

 first of August, keeps up during the whole month and 

 in early September, but the last are gone by the middle 

 of the month, departing with their roost-fellows, the Martins 

 and Cliff Swallows. 



*017. Stelgidopterix serripennis (Aud.). Rough-winged 

 Swallow. 



Hirundo serripennis. Cotyle serripennis. 



Geog. Dist. — From Costa Rica to Connecticut, central Massa- 

 chusetts, southeastern New York, Ontario, northern Indiana, 

 southern Wisconsin, southern Minnesota, North Dakota, Mon- 

 tana, British Columbia; breeds from Georgia, Louisiana, 

 Texas and Vera Cruz northward and winters south of United 

 States. 



In Missouri a fairly common, generally distributed summer 

 resident, never in large colonies like the Bank Swallows, but 

 often in their colonies, or in single pairs or a few pairs near each 

 other, scattered along creeks and rivers in all parts of the state, 

 perhaps most numerous in the Ozark and Ozark border region 

 and the bluffs of the larger rivers. They are among the earliest 

 of this family to arrive at their breeding stands, where the 

 first are seen in southern Missouri in the second week of March 

 (March 10, 1902, Festus, Jefferson Co.), at St. Louis soon after 

 the middle, and at the northern border before the end of the 

 month. Like other swallows their ranks fill up slowty, and it 

 is fully a month before all have returned to their wonted haunts 

 about bridges, railroad cuts, ravines, old quarries, out buildings, 

 etc., always, if possible, not far from water. Flocks are found 

 in August from sixty to a hundred or more, adults and young, 

 mostly the latter, resting together for hours on dead trees or 

 brush on the banks of lakes or rivers; feeding together, keeping 

 and moving together until the time for departure has come. 

 From most of their haunts they are gone by the middle of Sep- 

 tember, but not so from the Mississippi bottom in St. Charles 

 Co. where they remain into October, even into the second week 

 of the month, the last, a troop of one hundred, being still present 

 October 13, 1905, at one of their places of rendezvous at Horse 

 Shoe Lake, an old bed of the Cuivre River. 



