212 Rev. G. A. Crawshay on Tetropium gabrielt. 
the transformations to the pupal and perfect state and the 
manner of emergence of the imago from the cell may be 
observed continuously and accurate knowledge arrived at. 
No. 5.—Where it is not desired to watch the insect in 
its latter stages very closely under glass the following 
method will be found useful. Split a piece of wood and 
with a 4-in. gouge make small hollows on the surface of 
one piece resembling pupa cells. Place the full-fed larvze 
or pups in these, replace the counterpart and bind tightly 
with string. The string can be untied and the progress of 
the insects watched as often as is desired. The wood 
must be moistened if it gets very dry. Wood with sap 
in should be used, and the pieces of wood placed in tins 
to preserve the moisture so far as possible. 
In conclusion [ would express my thanks to Mr. C. J. 
Gahan for his always ready assistance in connection with 
the subject of this paper; to my brother Mr. L. R. Craw- 
shay for his well-executed drawings on Plate XX, and also 
to Messrs. T. E. and W. R. Roland of Fenny Stratford for 
kindly affording me every facility for the observation of 
the species in their extensive saw-mills. 
EXPLANATION OF PLATES XV—XX. 
[See Explanation facing the PLATES. | 
