Vol. xxiii] ENTOMOLOGICAL NEWS. 257 
Sharp (Cambridge Nat. Hist., VI, Insects, II, 47, 1899) 
speaks of Anthidium septemdentatum of Europe using resin as 
its working material, and an old snail shell for its nest. 
Dianthidium curvatum Smith, Syn. interruptum Say. 
One male and one female from Sherman and Thomas 
Counties, July. 
The genera Anthidium and Dianthidium differ from each 
other not only in structural characters, but likewise in habits 
(that is, as far as we know of the habits of these bees). Cock- 
erell in his Rocky Mountain Bees (Univ. of Colo. Studies 
VII, No. 3) separates them thus: 
“No pulvillus; cottony material used in preparing nests, which are 
burrows—Anthidium Fabr. (P). 
“Pulvilli present; nests made of resin, on rocks, ete—Dianthidium 
GhIE-¢P).” 
Megachile sp. 
Several bees of this genus were observed nest building. One 
used a burrow in a sand bank. The hole was five or six inches 
long and contained the usual leaf nest, somewhat over two 
inches in length and of several cells. 
Megachile sometimes invaded our tent in search of a suit- 
able nesting place. One of these bees chose a cork-lined cigar 
box loosely filled with cotton and built her nest along the edge 
of the cork and side of the box. 
The following are our observations on a species of Leaf- 
cutting Bee. Atwood, July 23, 1910: 
On July 23 a bee was observed carrying bits of leaves from 
a rose bush to some spot between the folds of one of the blan- 
kets at the camp. It was an interesting thing to watch this 
bee at her work. Alighting on a leaf and opposing herself to 
the edge of a leaflet she would begin cutting, working her 
mandibles like a pair of scissors. In five or six clips she 
would have a portion of the leaflet smoothly cut and neatly 
rolled into a cylinder, and with this held by her feet beneath 
her she would fly away to the blanket. Several trips were 
