202 UNIVERSITY OF COLORADO STUDIES 



Subgenus HEMIBERLESIA, Cockerell 



Female with circumgenital glands; usually on palms . . . latanicr, signoret 



Female without crcumgenital glands; on various plants acuminatus, targioni-tozzetti. 

 Note. — These are exotic species, occurring only on indoor plants. A. acuminatus 

 is more generally known as A . rapax, Comstock. 



Subgenus DIASPIDIOTUS, Berlese and Leonardi 



Adult female without circumgenital grouped glands ...... i 



Adult female with such glands, at least four groups ...... 2 



1. Native species, on Pinus in New Mexico; median caudal lobes of female broad 



and low ......... conijerarum, ckll. 



Introduced species, on fruit trees in the Mesilla Valley, N. M.; median lobes much 

 longer and narrower; scale of female gray, with the exuviae central, or nearly so, 

 yellowish ........ perniciosus, comstock. 



2. Female scale comparatively large, diameter 3 mm., or nearly; exuviae when 



rubbed shining orange or foxy-red ........ 3 



Female scale smaller; diameter 2 mm. or less ...... 4 



3. Female scale (except the exuviae) white; New Mexico, usually on fruit trees 



juglans-regia albus, ckll. 

 Female scale (except the exuviae) brown; on plum at Las Cruces, N. M. 



... . . . . . . . juglans-regia pruni, ckll. 



4. Female scale dull pale orange-brown; on Chilopsis in the Mesilla Valley, N. M. 



coloratus (ckll.) 

 Female scale pale greyish, exuviae dull orange; female similar to A. ancylus, but 



second lobe developed; Colorado and New Mexico, on fruit trees howardi, ckll. 

 Female scale blackish or dark grey to dull black, the exuviae when exposed orange- 

 red 5 



5. Second lobes of female absent or rudimentary; chitinous process on inner side of 



first interlobular incision straight; New Mexico and Colorado, on maples and 

 fruit trees ......... ancylus (putnam) 



Second lobes of female small but distinct; chitinous process on inner side of first 

 interlobular incision curved; Mesilla, N. M, on apple; Colorado City, Colo., on 

 Cercocarpus parvijolius ....... jorbesi, JOHNSON 



Note. — A. candidulus, Ckll., occurs on Prosopis in Arizona; A. townsendi, Ckll., on 

 ash in Arizona; A. ulmi, Johnson, on elm in Kansas; and A. uva>, Comstock, on grape- 

 vine in Kansas. 



CHIONASPIS, SIGNORET 



Male scale without longitudinal keels; on willow . . ortholobis, COMSTOCK 



Male scale with one or more keels ......... 1 



1. Median lobes united to form a single lobe in adult female; on oak, Organ Mts., 



N. M. . . . . . . . . . . quercus, comstock 



Median lobes separate in adult female; not found on oak .... 2 



2. Female scale usually narrow; on leaves of conifers, especially Pinus, Colorado 



and New Mexico pinijolia (fitch) 



