JUL6- 1914 
The Ohio £)Naturalist, 
PUBLISHED BY 
The Biological Club of the Ohio State University. NEW YORK 
R OTANIC * • 
Volume XIV. JUNE, 1914. No. 8. •A*'' 
TABLE OF CONTENTS 
Hine— Diptera of Middle America. 333 
Lamb— Middle Mississippian Unconformities and Conglomerates in Northern Ohio . 344 
McAvoy—T he Panieums of Ohio. . 347 
McAvoy—M eetings of the Biological Club. 355 
Rice— Meeting of the Executive Committee of the Ohio Academy of Science. 356 
DIPTERA OF MIDDLE AMERICA. 
FAMILY SYRPHID.-E. 
Jas. S. Hine. 
A large number of species of diptera from southern localities 
have accumulated in the collections at the Ohio State University. 
They have been procured from various sources and come from 
many localities, having 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 Syrphidas I offer for pub¬ 
lication the following notations on the included species. For the 
pur]loses of this paper and those of the same series to follow the 
term “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; 
antennae 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 uniformly fumose. Five speci¬ 
mens from Bartica, British Guiana, April and May. 
333 
