bo 
(or) 
Annals Entomological Society of America  [Vol. XIV, 
D. ferrugatella Rohwer is practically the same as D. zella, in the former 
the erect hair of head is paler, and that on the apical segments 
of abdomen white, while in the latter species the erect hair of head 
is dark, and the hair on apical segments more yellowish. 
D. mutata Blake, as I have identified it, is but a form of cypris in which 
the apical hair of abdomen is white, instead of the pale golden of 
D. cypris. 
D. plesia Rohwer, I have not seen, but is said to agree with D. ferrugata, 
except that the third joint of antenne is shorter. 
D. errans Rohwer runs to sappho, except that there is a median patch 
of black hair on apex of second segment. 
D. segregata differs from D. champlaini in shorter thorax, and longer 
second segment. I have not seen it. 
D. virginica Rohwer and D. carolina Rohwer I have not seen. According 
to Rohwer (in litt.) both have the scutellar scale, and lack the 
carina at tip of mesonotum. They would therefore come close to 
D. zella, but appear to be larger; but I have specimens I believe to be 
zella, which are fully as large and agree with description of 
virginica. 
D. vierecki Rohwer agrees with zella, except that there is no ventral 
carina on first segment. Although the shape of this carina varies 
in D. zella, I have seen none without it. 
