64 OHIO BIOLOGICAL SURVEY 



which are depressions radiating from the center. Between the tubercles the surface 

 of the cornua is finely papillose. The scars of seven pai-s of pro-legs and the position 

 of the anus show on the ventral side ( Fig. 1 1 1 , <? and d) . 



This specimen was taken from tinder the bark of a fallen log along 

 the Olentangy River. The log lay quite close to the edge of the water, 

 and the larva may have been aquatic and migrated to the log for pupa- 

 tion, or it may have lived in the log thru the larval stage. 



Myiolepta -"The metamorphoses have been recorded from decay- 

 ing Poplar {Populus) and Maple {Acer) trees, in which case they prob- 

 ably feed on the exuding sap and thereby tend to confirm their relation- 

 ship to Xylotar Verrall, British Fhes, p. 573. 



Baccha— "The larvae feed on Aphides or Coccidae:' Verrall, British 



Flies, p. 456. 



Townsend, Jour. N. Y. Ento. Soc. V., 172 briefly describes the pupa 

 of Baccha clavata as follows: "One male bred from pupa found in square 

 of cotton at Carmen, May 24. The pupa was fastened by its anal end to 

 the inside or the sqtiare. Length 5.67 mm. Pale greenish-yellow. 

 Oval with a flat ventral surface, full and rounded on anterior end. A 

 few short, hair-like filaments of integument on dorsal surface in five 

 transverse rows, the first row being on anterior end above cephalic plate. 

 The adult was found issued May 31." 



Perkins, "Leaf- Hoppers and their Natural Enemies," Hawaii 

 (1906) p. 177-179, reports a species of Baccha feeding upon young leaf 

 hoppers in Qtieensland. 



"Osten Sacken, 'Entomologische Notizen,' Stettin. Ent. Zeit. 

 XXIII, 412 (1862), refers to earlier records of habits Baccha spp. 

 especially Coccidivorous forms. 



H. G. Hubbard (1885) describes three species of Syrphidae feeding 



among aphids on the orange as follows: 



The Four Spotted Aphis Fly. {Baccha bahista Walker.) The larva has a cylin- 

 drical body, greenish, with a longitudinal band of dull red on the back; the surface is 

 covered with very short, stiff hairs, giving it a velvety appearance; each joint of the 

 body is artnad with a. row of soft spines above and a pair of fleshy pro-legs below. 

 Length, when at rest, 7.5 mm. The puparium, has the form of a cone, with one side 

 flattened and fastened to the surface of the leaf; the large end broadly rounded; the 

 color varies from dirty white to dull yellow, and there are more or less distinct cross- 

 shaped markings upon the back; the spines of the larva shrink to minute prickles on 

 the puparium. The eggs are elongate-oval, brilliant white, the surface marked with 

 diamonds obliquely intersecting engraved lines. They are deposited by the parent fly 

 singly upon the leaves among Plant-lice. 



The Dusky-Winged Aphis Fly. {Baccha litgens Loew.) Scarcely less common 

 ih^n the preceding; the larva more leech-like, fla'tenedand dilated behind, but with 

 the anterior joints lengthened into a very mobile and extensible neck. The surface of 



