58 Sal Ie HUMBLE-BEE II 
rear their young. Lucorum is milder tempered and 
less vigilant than ¢evrest¢r7s, and one can well imagine 
that in a contest between a éerrestris and a lZucorum 
the ¢ervrestris would be victorious.? 
* See my article in the Zxtomologist’s Monthly Magazine for 1899, p. 233. 
