N 
A TABLE TO FACILITATE THE DETERMI- 
NATION OF THE MEXICAN SCALE-INSECTS 
OF THE GENUS ASPIDIOTUS 
(SENS. LATISS.) | 
T. D. A. COCKERELI 

Or all the Coccidz injurious to cultivated plants, none are 
more easily carried to new countries, or more likely to cause 
trouble, than the species of Aspidiotus, sens. /atiss (including 
Chrysomphalus, etc.). Some years ago I prepared for my own 
use a table of the Mexican forms of this group which were 
known to be or likely to prove of economic importance, using 
only characters which could be determined with a hand lens. 
This table is now presented with the hope that it will be useful 
to those who have to deal with injurious Coccide. The deter- 
mination from the scale should of course always be confirmed 
by reference to a detailed account of the insect; but in the 
majority of cases, at least, the indications of the table will be 
found correct. 
I. 
> . " . 2. 
(on mango, Frontera) 
ae Ckll. 
9 scale much broader (on cactus, Frontera) bowreyi Cll. 
9 scale minute, less than 1 mm. diam., Hu or very dark brown or 
Bray : ; : : i ` 5 
9 RER ie 4 
9 scale very convex, exuvie Gomis Het " a ring various 
plants) personatus Comst. 
? scale broad evittorn, first skin exon (ou mesquite, Hermosillo) 
prosopidis Ckll. 
Scale dark with orange or copperred exuvie — . i A } 5. 
Scale white or light colored, with darker exuvie ; : 8. 
Scale blackish or brown, with concolorous or oes exuvie 14. 
Scale pale or reddish, with concolorous exuviae . 19. 
Exuviz lateral, at one end of the oval scale ; scale black "id more or less 
grayish and whitish concentric strigation ; exuviae deep ips Vapor 
9 scale elongated 
9 scale circular or baai SOM. 
1. 9 scale linear, 21 mm. long, : mm. broad. 
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