THE SYRPHIDAH OF OHIO 63 



"Pipiza iiioclesta, Loew, was reared from apple twigs infested by Schizoneura 

 lanigera (Hausm)"— F. M. Webster, Canad. Eiito. XXX, p. 19. 



Paragus — Rondani about 1S48 published notes to the eflfect that the 

 larvae feed on aphides which occur on or near the roots of Ccntaurca and 

 on Scvichus. Verrall in his work on British Flies in several places states 

 his impression that this is not authentic and makes a special division of 

 larval habits for those "living in the nest of smaller Aculeate Hynie- 

 noptera. " He says (p. 674) "I have no evidence to support this group, 

 but I strongly suspect Eumcriis and Paragus,'" since "the species have a 

 ver}^ suspicious habit of hanging about the burrows of the small HalidP' 

 (p. 150). 



The present studies happily clear up this doubt and settle once for 

 all that the larvae, at least of P. bicolorsind P. tibialis, are aphidophagous. 



Chilosia — "Not much is known about the metamorphoses of any 

 species of this genus, but some larvae have been reared from fungi and 

 others from stems and roots of plants, which seems to show that their 

 habits are widely divergent from the genus Syrpluis.'" Verrall, British 

 Flies, p. 207. 



Chalcomyia— In the collection of Prof. James S. Hine is one male 

 specimen of C. acrea with puparium attached which bears the label "Pupa 

 taken under bark, Columbus, Ohio, 4-1 1- 1902." To him I am indebted 

 for the opportunity of here describing the puparium and for the following 

 notes on it. 



Pupariinn described from one specimen: 



Length of body about 7 mm., posterior respiratory appendage, or "rat-tail" pro- 

 jecting that mncli farther, fixed in a curve. Fonr-fifths of its length consists of the 

 basal segment which has a diameter of about o 5 mm., at the base, but tapers some- 

 what toward the end. The middle and distal segments are each extended only about 

 0.75 mm., diameter 0.2 mm., or less; these are shining reddish-brown. The basal 

 segment and the body generally are dull, dirty, grayish brown. The vestiture 

 is obscured; but the middle segment of the respiratory tube shows transverse wrin- 

 kling, in which respect it differs from the corresponding structure of Eristalis acnciis. 



Width of puparium 3.25 mm., height about the same. Shape ovate, the antero- 

 dorsal part which separates as the operculum, flattened, bearing on its anterior part 

 the larval respiratory cornua; while just back of the line where the operculum sepa- 

 rates are located the pupal respiratory cornua. (See Plate VI, Figs. 111-115.) 



The anterior or larval respiratory cornua are fixed at a length of about 0.25 mm., 

 their diameter being about 0.125 mm. The spiracles at the tip show seven to nine, 

 somewhat elongate, teeth-like lobes as shown in Figs. 11 2-1 13 of Plate VI. 



The pupal respiratory cornua (Figs, tii b, 1 14) are short and thick, 0.75 mm. 

 in length l)y about half as broad, clavale by the elevation of the numerous tubercles 

 thru which 1 believe the spiracles open. These are about 100 in number in this 

 species (Fig. 114). They show at their ti]) three or four nodules (Fig. 115), between 



