UNITED STATES 
DEPARTMENT OF AGRICULTURE 
MISCELLANEOUS PUBLICATION NO. 305 
Washington, D. C. June 1938 
THE HORSEFLIES OF THE SUBFAMILY 
TABANINAE OF THE NEARCTIC REGION 
By ALAN STONE,’ associate entomologist, Division of Insect Identification, 
Bureau of Entomology and Plant Quarantine 
CONTENTS 
Page Page 
MAtrOduUCchlone asses eee eS Jes Steet iniehe genus Yicladocera Wutz. 22 ee ee ee 14 
Hconomicimportances. 252. 2. 2-2 - 2| The genus Atylotus Osten Sacken____________- 19 
FRCIATIOMS MIP Stee ee ey See ele ee Se 3 | The genus Leucotabanus Lutz____------------ 24 
Characters of value and their terminology____ 4 | The genus Chlorotabanus Lutz____-________--- 27 
USSR atlON Seamer e e  R 5 | The genus Anacimas Enderlein____________--- 28 
The genus Merycomyia Hine__________--_------ 6HPeeheigenusiStenotabanus Lutzes2 hi ses eee 31 
Key to the genera of Nearctic Tabaninae____- 6 | The genus Tabanus Linnaeus___-.------------ 36 
The genus Haematopota Meigen___-_--------- if | OMLECOPNIZECISWECIES=+ Lee ae eae eT eee 163 
The genus Bolbodimyia Bigot_____--_---_---_- 110) | Meiteraturercitedecy = 5 faa es et ee 167 
The genus Whitneyomyia Bequaert____-______- iede'| Slit dl @ wees re ree ete ar EN 8 IY or a et 169 
The genus Diachlorus Osten Sacken_-_-___---__ 12 
INTRODUCTION 
In 1875-78 Osten Sacken’s Prodrome of a Monograph of the 
Tabanidae of the United States appeared. In this work (75\+_28 
United States Department of Agriculture 
Miscellaneous Publication No. 305 
CORRECTION SLIP 
Page 15, couplet 2, line 7, for Widemann read Wiedemann. 
Page 41, couplet 57, line 1, for styqins read stygius. 
Page 48, couplet 15, line 2, for fumipenins read fumipennts. 
Page 51, couplet 65, line 1, for tribial read tibial. 
Page 74, paragraph 2, line 1, for dialonal read diagonal. 
