FOOD HABITS OF THE SWALLOWS. 



25 



coleoptera — continued. 



Macrops sp 1 



Balaninus sp 1 



Anthonomus grandis 12 



Conotrachelus nenuphar 1 



Cryptorhynchus Msignatus 2 



Hypocceliodes wiekhami 1 



Cceliodes acephalus 3 



Perlgaster cretura 1 



Limnoharis blandita 1 



Baris conftnis . 1 



Baris wrea 2 



Rhinoncus pyrrhopus 1 



Bhinoncus longulus 1 



Centrinus picumnus 2 



Calandra oryza 



Pityophthorus minutissimus 1 



Tomicus calligrapMcus 1 



Tomicus sp 1 



coleoptera — continued. 



Hylastes tenuis 1 



Hylastes sp 2 



Hylesinus sp 1 



Brachytarsus plumbeus 1 



DIPTERA. 



Culex sp 1 



Calliphora sp 2 



Luoilia sp 4 



hymenoptera. 



Chrysis sp 1 



Myrm/ica scabrinodis 4 



Pimpla sp 1 



Ophion sp 1 



Bassus sp 1 



Bhodites sp 1 



ROUGH-WINGED SWALLOW. 



Stelgidopteryx serripennis. 



The rough- winged swallow (PL II, middle figure) occupies the 

 United States from ocean to ocean and from the Gulf of Mexico to 

 the latitude of southern New England in the East and of southern 

 Canada in the West. It is not abundant except locally and is found 

 much more frequently in the more southern parts of the country. 

 Its nesting sites are very often like those of the bank swallow; in 

 fact, they may be the old abandoned burrows of that species ; but in 

 general they are holes in cliffs, ledges, banks, of earth, or crannies 

 in bridges, and other structures of man. As a rule, rough-winged 

 swallows do not dig holes for themselves. They do not live so much 

 in large colonies as do the other species of swallows, and a pair may 

 frequently be found breeding by themselves, though a colony of five 

 or six pairs is more common. In migration, however, they collect in 

 large flocks. 



The following study of the food of the rough-winged swallow is 

 based upon examination of the contents of 136 stomachs, collected in 

 15 States, the District of Columbia, and Canada, and in the months 

 from April to September. The food was practically all animal 

 matter, except that in one stomach were a lot of woody granules of 

 uncertain origin, in another a piece of root, and in a third two 

 seeds of currant (Ribes). In the final analysis these amount to 0.21 

 per cent and so may be dismissed without further comment. The 

 real food is made up of insects, a few spiders, and a snail. Of the 

 insects, 14.83 per cent are beetles, only 0.5 per cent of which are of 

 useful species. The May-beetle family (Scarabseidse) (2.69 per cent) 

 were mostly the small dung beetles (Aphodius), with a few larger 

 forms. Weevils or snout beetles (4.93 per cent) embrace a few inter- 

 esting species, as the alfalfa weevil, found in 11 stomachs; the cotton 



