454 ANNUAL RECORD OE SCIENCE AND INDUSTRY. 



2d Jay of November, 18G5, in latitude 25 28' N., longi- 

 tude 41 33' W\, making the nearest point of land 1200 

 miles off. They came on board in a heavy rain-squall, the 

 clouds and ship's sails being full of them for two days, as 

 certified to by E. G. Wiswell, master of the vessel. This 

 species appeared in Corfu, in Spain, and even in England. 

 The Corfu swarm, adds Mr. Scudder, was composed of the 

 variety with yellow-colored hind-wings, and therefore came 

 from Northern Africa, where that form is found, while the 

 Spanish and English swarms were of the rose-colored variety, 

 and must have originated in Senegal. "But the most inter- 

 esting point of all is the fact, first pointed out by Stol, that 

 all the other species of that group of the genus to which this 

 species belongs are American ; whence it is highly proba- 

 ble that A. peregrinum also is indigenous to America, from 

 whence it has been recorded. Its occurrence in mid-ocean in 

 such numbers is a clear indication that it originally flew from 

 one continent to the other in sufficient numbers to establish 

 itself in a new home." 



During a late trip to the Western Territories, Professor 

 Leidy, while watching some cliff-swallows passing in and out 

 of their mud-built nests, was told that these nests swarmed 

 with bed-bugs, and that people would not usually allow the 

 birds to build in such places, because they introduced bed- 

 bugs into the houses. lie collected a number of the bugs 

 from the swallows' nests, as well as from the houses. The 

 latter were found to be the true bed-bug ; the former the 

 Cimex hirundinis. The bugs infesting the bat and pigeon 

 have likewise been recognized as a peculiar species, with the 

 name of C. pipistreUi and G. columbarius. The habit of 

 C. hirundinis was found to be similar to that of C. lectula- 

 rius, the bed-bug, in the fact that the bugs during the day- 

 time would secrete themselves in the crevices of the boards, 

 away from the nests. After sunset he had observed the 

 bugs leave their hiding-places, and make their way to the 

 nests. From these observations it would appear as if the 

 bugs peculiar to these animals (swallows and man) did not 

 reciprocally infest their hosts. 



