1927] 
Notes on the Megachilidoe 
179 
Megachile shermani Mitch. = Megachile floridana Rob. 
The type of M. floridana has been received from Professor 
Robertson, and a comparison of the two types shows them to be 
the same. 
Megachile ahducta Mitch. = Megachile sidalceoe Ckll. 
A comparison of the type of ahducta with specimens of 
sidalceoe determined by Professor Cockerell indicates that these 
are the same. 
Megachile aspera Mitch. = Megachile relativa Cress. 
At the time M. aspera was described it was suspected to be 
the same as M. exclamans Vier. It has since been compared with 
a homotype of relativa and is doubtless the same. M. exclamans 
is possibly the female of M. infragilis Cress., but I have not yet 
seen the type. 
Megachile strophostylis Rob. = Megachile integra Cress. 
A determined specimen of strophostylis received from Pro- 
fessor Robertson is the same as the female of integra. 
Megachile tephrosiana n. sp. 
$ . Head broader than long, eyes subparallel; supraclypea^ 
plate impunctate medially, but closely punctured laterally; cly- 
peus with a median longitudinal area which is almost impunctate, 
the punctures becoming close and rather fine laterally, apical 
margin entire; mandibles black, very broad, sparsely striately 
punctate on upper face, 5-dentate, the three apical teeth low but 
distinct, the two inner ones with hardly any emargination be- 
tween them and thus forming a straight edge; cheeks broader 
than eye, the punctures close, fine and shallow below, becoming 
more sparse and distinct above, shining, with thin white hair on 
lower half, the pubescence above thin, short and black, with 
some black hairs on posterior orbits all the way to the inferior 
angle; vertex slight^ rounded, shining, the punctures deep and 
widely separated, the pubescence short, sparse and black; lateral 
ocelli slightly nearer eyes than to edge of vertex; antennae black 
above, obscurely reddish below, first joint of flagel twice as long 
as broad, the second with length about equal to breadth, and the 
others gradually increasing in length to the apical one which is 
twice as long as broad; pubescence thin on face, long and greyish- 
