CONTENTS 
PAGE 
What is the Matter with the Elms in Illinois?. 1 
Description of the Difficulty. 1 
A Typical Case. 2 
Distribution of the Injury. 3 
A Kentucky Instance. 3 
An Earlier Illinois Case... 4 
The Present Situation. 4 
Causes of the Injury. 5 
Prospects of Continuance. 8 
Remedy and Prevention. 9 
The Insects chiefly concerned. 10 
The Elm-borer, Saperda tridentata Oliv. 11 
The Reddish Elm Snout-beetle, Magdalis armicollis Say. 13 
On Black-flies and Buffalo-gnats ( Simulium ) as Possible Carriers of Pel¬ 
lagra in Illinois. 21 
Purpose and Scope of the Work. 21 
General Description . 22 
Number and General Distribution of Species. 23 
Injuries to Man. 23 
Injuries to Domestic Animals. 26 
Prevention and Protection. 27 
General Features of Life History of Illinois Species. 28 
Breeding Situations of the Black-flies. 29 
The Illinois Species of 8imulium . 31 
8. bracteatum Coq. 31 
8. hirtipes Fries ... 31 
8. johannseni Hart, n. sp. 31 
description . 32 
« 
8. meridionale Riley . 37 
8. pecuarum Riley . 40 
8. pictipes Hagen . 41 
S. venustoid'es Hart, n. sp. 42 
description . 42 
8. venustum Say . 44 
8. vittatum Zetterstedt . 47 
Possible Relations to Pellagra. 48 
Articles consulted—American and English. 53 
-Insects Injurious to Stored Grains and their Ground Products. 56 
Granary Moths . 58 
The Angoumois Grain Moth, 8itotroga cerealella 01. 58 
Description . 59 
Life History . 60 
Distribution, Injuries, and Enemies*.. 60 
