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Seventeenth Report 
State Entomologist of Minnesota 
To the GOVERNOR 
By A. G. RUGGLES 7 an 
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SUBJECT INDEX 
Page 
General report on insect conditions in 1918, Publications, Financial State- 
mamesone Biol Ince Gri INsiryeinynen, IBY VAG IG. IaierelleSo 5555 4ocg Ince d husk oe 3 
Life History of an Oak Twig Girdler, (Agrilus arcuatus Say and var. tor- 
GRINS JES Cs)\y EWING (Gre M Rebietoal (Scents ee cent aio eh Gis ais omacio eS colo ae owe 15 
torent, Somers rin Winomesouay. ley So Nk Cres yin. oaolucoscddeueccocenoeds 21 
The Carpenter Ant as a Destroyer of Sound Wood. By S. A. Graham.... 32 
Drosophila in’ Bottled Certihed Milk. By Wn Az Riley......5;°. = vache hee s 4] 
Contribution to Knowledge of the Tribes and Higher Groups of the Family 
Apiididae Cbomoptera). By (Ol We Oestlundssccne. see. ene aoe 46 
The Confused Flour Beetle (Tribolium confusum Duval). By R. N. 
(@hiebp rival sp cheeses steeeas circ saree Saracen ae seme aa ea ee Us gee 73 
The Clover Seed Chalcid (Bruchophagus funebris Howard). By Warren 
Wall ienm SO tate way. oe tis atea cone ee ac oboe witty sae anne eek apace oneal a ca ciire RIO estate ees toner arene 95 
A Preliminary Report on the Trombidiidae of Minnesota. By C. W. Howard 111 
The Hymenoptera of Minnesota. By F. L. Washburn.................... 145 
Mines otambanhennyalmsradi cation, Wawenr-msnciin: ceieack cite ciiateeie citer ies 239 
Agricultural Experiment Station 
University Farm, St. Paul, Minn. 
December 1, 1918 
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