664 General Notes. [June, 
exhibit in resisting the effects of insecticides is well known. They 
speedily recover from the effects of benzine; they will live for 
_ days in a tight jar filled with camphor or napthaline, and when 
they are within some dried insect they are unaffected even by the 
strongest volatile poisons, such as cyanide of potassium. 
There are three prerequisites which we believe to be more im- 
portant than insecticides in protecting insect collections. They 
are: Ist, absolutely tight boxes; 2d, the quarantining, for a 
ficient length of time, of all specimens received through exchange 
or otherwise; 3d, the keeping of the boxes closed as much as 
possible during the time of the year when the parent Dermestid 
beetles most abound. In the climate of Washington this dan- 
gerous period extends from April till June—perhaps a little lon- 
ger. At any other season there is not much danger from Der 
mestid beetles. 
Tue Cuicor IN Arrica.—It is stated in Burton and Camerons 
“To the Gold Coast for Gold” that the chigoe (Pulex penetrans) 
has been recently introduced and has spread all over the est 
African seaboard and far into the interior. At the time of Captain 
Burton’s first visit (1862) it was unknown on the west coast; but 
now it ranks with the indigenous red, white and black ants, cèt- 
tipedes, scorpions, venomous spiders and flies of the tzetze group, 
as among the chief plagues of that region. . 
— Herbert Morris, Germantown, Pa, of se 
[In our experience we have found that while the beer 
species is usually found upon the ground where it has 
with the leaves, yet it is quite frequently attached as aw 
scribed, and as we have recorded in our Fourth Report x 
° : í ars 
curve of the margins of the labium gradually pii has p 
maxillæ per 
mouth, at the point of origin of the paraglossæ. Besides : 
