70 OHIO BIOIvOGICAL SURVEY 



human cominunicatiou from the Western States became continuous with 

 Eastern States, where it made its appearance about 1875, after which it 

 spread with marvellous rapidity over the Eastern States and became an 

 abundant species by 1884. Osten-Sacken further comments upon this 

 species not crossing from Europe to Eastern America in four centuries of 

 intercourse but spreading by land, and then says it will be interesting to 

 watch if it will reach distant islands such as New Zealand. It appears to 

 have reached New Zealand two years after that, and to have become com- 

 mon there in one year." p. 508, Verrall, British Flies. 



"Eristalis temporalis (Jiirtus Ew.) Reared from maggots found in 

 ooze about the mouth of a drain at Fort Collins. Flies emerged from 411 

 to 5-3." Baker, Ent. News. VI, 174. 



Larvae probably of E. tenax are reported as infesting a well in South 

 Carolina in Ins. Life, III, 22. Ordinary cleaning of the well does not 

 get rid of them, but they quickly redevelop, so that one bucket of water 

 will frequently contain three or four. 



Tropidia — "Metamorphoses not known." Verrall. 



Helophilus — "Meigen states that H. pendulus has been bred from 

 putrid water." Verrall, Briti-sh Fhes, p. 524. 



Lintner, 7th N. Y. Report pp. 228 to 234 discusses the life-history 

 of H. latiftons and from this the following notes are taken: The larvae 

 of //. lali/rons were received in 1885 from Dr. Morrey who had taken 

 them at Nassau, N. Y. They were numerous in a water tank, July 

 fourth, but a week later only a half dozen could be found. A week later 

 when they floated on the surface of the water they presented the follow- 

 ing features: The body was sub-cylindrical, narrowing somewhat ante- 

 riorly, one-half of an inch in length by one-eighth of an inch broad; 

 beneath whitish, pale brown above, becoming darker towards the tail; the 

 several segments showed six divisions (as wrinkles or folds) above, of 

 which the front one is the broadest. On segments two to seven apparently 

 (the posterior ones not being separable) are six pairs of tubercle-like 

 feet," [Buckton states that there are seven pair of pseudopodia] "which 

 when protruded show each a short black spine. The head bears anteri- 

 orly two brown, slender, blunt projections, so short as to be barely visible 

 without a magnifier. The first two joints of the dark brown tail are cor- 

 rugated, and measure 0.7 inch in length, with the terminal, black-tipped, 

 extensile joint projecting from them one-fourth of an inch. They were 

 transferred to a box of dampened sawdust into which they buried them- 

 selves for pupation the middle of July. The pupation is a brief one of 

 about ten days." The larvae in an old molasses cask, with an inch of 



