REVISION OF STREPSIPTERA — PIERCE. 51 



14 males and 1 female bee at Hampstead Heath, England, on April 6, 

 containing in all 17 male Stylops. The captures were made between 

 9.40 a. m. and 12.20 p. m. The wind was southwest, the day warm; 

 the sun was out between 10 and 11.30. He gives us the following 

 very interesting note on flight: 



At a little before half-past 111 saw something flying in a very peculiar manner over 

 a broom-brush. I captured it with my net. It proved to be a male of Stylops. I 

 think I should know a Stylops on the wing the moment I saw it. Its flight is different 

 to anything else I have ever seen — a very peculiar, unsteady flight, something like an 

 Ephemera, what I should call an uncomfortable flight, up and down, this way and 

 that way, in fact at all angles, not keeping in one direction more than a few inches, 

 perhaps for about 6 or 7. 



STYLOPS VICING Pierce. 



On June 18 Packard (1864) took at Salem, Massachusetts, a stylop- 

 ized Andrena vicina Smith, from which triungulinids were issuing to 

 the number of 300, according to his estimate. "In their movements 

 these infinitesimal larvae were very active as they scrambled over the 

 surface of the body of the parent, holding their caudal setse nearly 

 erect." 



STYLOPS, species. 



Smith (1874) recommended searching for stylopized bees between 

 the hours of 9 and 12 in the morning, as according to his experiences 

 the stylops always emerged from the body of the bee on the day on 

 which the latter first quitted its nest, should the day be bright and 

 sunny, and he also mentioned the fact of his never having captured a 

 bee which had a male stylops remaining in its abdomen at a later 

 hour than 12 m. He had himself bred stylops five or six times and 

 had never done so later than the month of April, always having cap- 

 tured the attacked or infested bees early in the day. Saunders (1874) 

 remarked that he had once found a number of bees in the afternoon 

 at dusk, some of which contained male stylops, but that on that oc- 

 casion the morning had been wet and dull, and therefore the bees 

 had probably only just made their appearance. 



Friese (1906) records capturing male stylops on the wing at Strass- 

 burg, Germany, April, 1888; Bozen, Germany, July 8, 1896; and 

 three individuals at Schwerin, Germany, on May 4, 1885. 



Thwaites (1841) says: 



On May 6, '38, caught a Stylops flying, and on the Tuesday following saw at least 

 twenty flying about in a garden at Kingdown near Bristol, but so high from the ground 

 that I could capture only about half a dozen. Since that time they have become 

 gradually more scarce, and to-day, May 12, I have not been able to see one. 



He says further: 



The little animals are graceful in their flight, taking long sweeps, as if carried along 

 by a gentle breeze, and occasionally hovering at a few inches above the ground. Their 

 term of life seems to be very short, none of those I have captured living above five 

 hours. 



