26 Psyche [March 
Following this and in place of page 41 is the sub-title 
page 
Dipterorum exoticorum 
Sectio II 
Antennis parumarticulatis 
which is placed in front of page 43, “Supplementum ad 
sectionem I.” It should have been placed in front of page 
45, “Section II. Antennis parumarticulatis. ” 
The text on page 38 ends some distance from the bottom, 
with a . Evidently whoever compiled the book 
lacked pages 39-42, and, thinking that the two leaves con- 
taining the title page of 1821 and the sub-title of Sectio II, 
filled the gap, bound them accordingly. All references to 
this work bear the date 1821. How r ever, from the copy 
here described, it is very evident that the first 38 pages 
and probably pages 39-42, and the supplement to Section I, 
pages 43 and 44, were published in 1820 and not in 1821. 
Pars I on the title page of 1821 would indicate that the 
author contemplated other volumes. 
It would be of interest to know if there are any other 
copies giving 1820 as the date of publication of the first 
section. This copy has been presented to the library of 
the Boston Society of Natural History. 
Charles W. Johnson. 
