The Ohio S\^a/wrafc/, 



PUBLISHED BY 



The Biological Club of the Ohio State Uni'versity. 

 Volume XIV. JUNE. 1914. No. 8. 



TABLE OF CONTENTS 



HiNE— Diptera of Middle America .- 333 



Lamb— Middle Mishissippian Unconformities and Conglomerates in Xorthern Ohio . . 344 



McAvoY— The Panicums of Ohio 347 



McAvoY — Meetings of the Biological Clnb , 355 



Rice— Meeting of the Executive Committee of the Ohio Academy of Science 356 



DIPTERA OF MIDDLE AMERICA. 



JFAMILY SYRPHID^. 

 JAS. S. HiNE. 



A large number of species of diptera from southern localities 

 have accumulated in the collections at the Ohio State University. 

 The}" have been procured from various sources and come from 

 many localities, ha^'ing been taken by different collectors. In 

 working up this material it is my purpose to consider one family at 

 a time. Having quite fully studied the Syrphida^ I offer for pub- 

 lication the following notations on the included species. For the 

 purposes of this paper and those of the same series to follow the 

 temi "Middle America" may be taken to include a wide stretch 

 of territory from Southern United States to points in South 

 America several degrees beyond the Equator. 



MiCRODON Meigen. 



Microdon angustus Macquart. This name is applied to 

 two specimens from Bartica, British Guiana. The body is elon- 

 gate, face, legs, scutellum and base of abdomen pale yellowish; 

 disk of thorax greenish black with a transverse narrow golden 

 band ; toward the apex the abdomen gradually shades into brown ; 

 antennas long, scutellum with spines. Total length 14 mm. 

 Microdon angustiventris Macquart must be very close to this 

 species. 



Microdon baliopterus Loew. One specimen from Gualan, 

 Guatemala, January 20th, 1905. 



Microdon bidens Fabr. Thorax greenish black, scutellum 

 with the extreme apex and two spines pale brown. Abdomen 

 and legs mostly reddish. Wings unifoiTnly fumose. Five speci- 

 mens from Bartica, British Guiana, April and May. 



■ ' - 333 



