Williams, Paul, <br/><br/>
Bumble Bees of North America :  an identification guide / 
 Bumblebees of North America 
Paul H. Williams, Robbin W. Thorp, Leif L. Richardson & Sheila R. Colla. 
 - 208 pages  color illustrations, color maps  23 cm 
<br/><br/> new book 2022 summer. 
<br/><br/>Includes bibliographical references (page 203) and index. 
<br/><br/>Introduction -- Observing bumble bees -- Attracting bumble bees -- Bumble bee forage guide by ecoregion -- Maps and seasonal activity -- Bumble bee decline and conservation -- Threats to bumble bees -- Natural enemies -- Mimicry -- Distinguishing bumble bees from other insects -- Bumble bee names and classification -- How to use this book to identify bumble bee species -- Species accounts -- Square-or long-cheeked bees with a rounded angle on the midleg -- Short-cheeked bees with a rounded angle on the midleg -- Medium- or long-cheeked bees with a sharp angle on the midleg -- Hindleg (tibia) with the outer surface uniformly convex and densely hairy (cuckoo bumble bees, no workers). 
<br/><br/> This guide allows amateur and professional naturalists to identify all 46 bumble bee species found north of Mexico and to understand their ecology and changing geographic distributions.--. 
<br/><br/><label>ISBN: </label>9780691152226 0691152225 
<br/><br/><label>LCCN: </label>2013945435 
<br/><br/><label>Nat. Bib. Agency Control No.: </label>016662260  Uk 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Bumblebees--United States--Identification<br/>Bumblebees--Canada--Identification<br/>Bumblebees--Geographical distribution--United States<br/>Bumblebees--Geographical distribution--Canada
<br/><br/><label>LC Class. No.: </label>QL568.A6  / W55 2014