46 
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. Small, about ı mm. diam., exuviæ covered, pem uppi when 
. Scale convex (on various plants) 
. Exuviz not conspicuous 
. Scale light brown m 
. Scale convex, dark gray cm mimosa, ER 
. Scale light reddish brown (on various plans 
THE AMERICAN NATURALIST. | (Vor. XXXIX. 
Exuviz central or nearly so ; : à à ; 6. 
Scale hardly 11 mm. diam., exuvie deep reddish (on oak, Amecameca) 
N Putnam. 
Scale 2 mm. or over in diameter 
Scale slightly raised, the exuvie coppery, ER like (on many PV 
aonidum (L.) 
Scale very flat, exuvi flat, not B ence num pale orange (on Citrus, 
etc.) sni Ckll. 
Exuvie light yw or orange ya 
Exuviæ at least partly brown or black 10. 
Exuviz covered (Coahuila) ne Ckll. 
Exuviz exposed (on various Das. $ bire var. zeriz, Bouché. 
First skin black or dark brown, second orange (Salina Cruz.) 
tricolor CkM. 
The exuviz practically all of one color Il. 
rubbed, then shining dark brown or black (on Yucca, u 
"E 
Larger, exuviz conspicuous without rubbing i 
RR (n 
13; 
Scale very dark N wih 3 a ha aie secretion (on 
orange, Cuernavaca albopictus Ckll. 
Scale grayish, border more or ib whitish el orange, Linares) 
NEN var. Zeonzs Twns. & Ckll. 
"4 
Scale flat 
Exuviz black or very dark. conspicuous . 
Jatropha ROME & di 
Scale very dark 16. 
mimos Coni. 
Scale flat, dark brown ersee Comst. 
. Scale covered by the epidermis of the EN the N black exuviz 
alone exposed (Orizaba) . 
Scale exposed i ; ; . 
Scales 3 mm. diam. (San Lots Potosi . nigropunctatus Ckll. 
Scales 1 to 1} mm. diam. (on Agave, Toluca) . agavis, Twns. & Ckll. 
Scale rather convex, exuviz nearly marginal (on em crawit, Ckll. 
Scale flat or flattish, exuviae not nearly margin 
calurus Ckll. 
18 
20. 
Scale light brown, exuviz not marked by a dot aid. ring (Tehuantepéc 
City) : : reniformis, Ckll. 
Exuvie marked by a i dat and rin 21. 
dicipsi ibi Morg. 
Scale darker (on Citrus, Oaxaca) oebelei, Twns. & Ckll. 
BOULDER, COLORADO. 
