VOL. III. | Mexican Ceroplastes. 255 
by necessity. At the present moment M. Kuntze’s much to be re- 
gretted work involves just such a necessity. The Berlin committee 
understand this, and in the list of names to be rejected and names to 
be preserved, in spite of the law of priority, it has accomplished a 
difficult task, for which gratitude is due to it. Its propositions are 
a development of our laws of nomenclature, such as should be made 
when abuses crop in or when negligence is discovered in the com- 
pilation of 1867. I have myself given utterance to ideas of that 
nature, from which I hope good results, although the action of an 
isolated individual must always be slower than that of a committee. 
Accept, dear sir and fellow member, the assurance of my cordial 
esteem. ALPH. DE CANDOLLE. 
NOTES ON TWO MEXICAN SPECIES OF CEROPLAS- 
TES, WITH A RECORD OF PARASITES REARED 
FROM ONE. 
BY Cc. HH. TYLER: TOWNSEND, 
The two scales below mentioned have been sent to’ me by Dr. 
Alfredo Dugés, from the vicinity of Guanajuato, Mexico. To Dr. 
Dugés also is due the credit for the information given regarding 
food-plants. . 
Ceroplastes dugesti J. Licht.—Found at Guanajuato “ more com- 
monly on Malvaviscus arboreus Cav. and MZ. acerifolius Presl., two 
shrubs of about 3 or 4 metres height; and accidentally on adjoining 
shrubs.’ This is a large species, nearly white, sub-hemispherical, 
showing no division into plates, the white waxy secretion being very 
susceptible to pressure and filled with a watery liquid. Specimens 
kept dry for months do not lose this liquid in the least degree. 
Those sent measure in length, 9g to 11 mm.; width, 7 to 9 mm.; 
height, 5 to 8 mm. 
Ceroplastes sp.—Found ‘‘on Bignonia (. buccinatoria?), and 
Chrysanthemum at Guanajuato.” This is guite a different species 
in appearance. It considerably resembles C. cirripediformis, but 
is more than twice as large. The waxy secretion is not so white 
as in C. dugesii, but more of a dirty gray in color, not so soft, dryer, 
and is very distinctly marked off into plates, much resembling in 
general form the carapace of the box-turtle ( Cistudo). There is 
a dorsal, central, rounded plate, with a central black navel-like 
