MICRODON GLOBOSUS: DISTRIBUTION AND HIBERNATION. II7 



Schiner states {Fauna Austn'aca, p. 250), that he has found the 

 larvae of European species, resembling small slugs, in colonies of For- 

 mica rufa, and also under logs in cattle pastures. 



Hibernation of the Fly. 



Mr. B. P. Mann states of the fly, ioc. cit.: '' I remember that, during 

 one or two years, at a certain season, which, as far as my recollection 

 serves me, was in April, I noticed numerous specimens of Microdon 

 r/lohosiis, issue from a nail-hole in the plastered wall of an apartment in 

 a dwelling-house, as though the flies had passed the winter within the 

 walls of the house," In this manner of hibernation within dwelling- 

 houses, it conforms to a similar habit recently published of Pollenia 

 rudis Fabr., one of the MuscidcB, which often occurs *' in large numbers 

 in the State of New York, in unused apartments of houses, under table- 

 cloths, in pillow-cases and wherever similar snug places of concealment 

 could be found." And it is not uncommon to meet with large com- 

 panies of these *' cluster-flies " in the angles of the ceiling and the walls 

 of unoccupied rooms. 



Distribution. 



Baron Osten Sackeiv gives the range of this species as the At- 

 lantic States. It was first described by Fabricius, from examples re- 

 ceived from Florida, Dr. Williston has received it from Massachusetts, 

 Connecticut, New York and Pennsylvania and Virginia. Michigan is 

 now to be added to its known localities. 



The genus appears to pertain to the eastern part of the North Ameri- 

 can continent, for while eight or nine eastern species have been cata- 

 logued for some time past, it has only been recently discovered upon the 

 Pacific coast in a single species which is as yet undescribed. 



Trypeta pomonella Walsh. 

 The Apple Maggot. 



Ord. DiPTERA : Fam. Trvpetid.e.) 



Walsh: in Amer. Jouru. Horticul. for Decern., 1867, pp. 338-343; 1st Ami. 

 Kept. Ins. 111., 1868, pp. 29-33, figs. 2, 2a. 



Walsh-Riley; in Amer. Eutomol., i, 1868, p. 59 (prob. ident. of insect from 

 N. Y.). 



LoEW : Mon. Dipt. N. A., Pt. iii, 1873, pp. 265-268 (descr. and remarks). 



Glover : MS. Notes Journ.— Diptera, 1874, p. 58, pi. 9, f. 14 (br. ref. and au- 

 thority;. 



