200 UNIVERSITY OF COLORADO STUDIES 



SAISSETIA, DEPLANCHES 



(Our species occur only on hothouse or indoor plants) 

 Adult female nearly always black, marked with a raised H . . olece (Bernard) 



Adult female smaller, very convex, red-brown, without a raised H . 



. hemisphcerica, (targioni-tozzetti) 



EULECANIUM, cockerell 

 Female 4 to 6 mm. long, 3 to 5 wide, very convex, reddish-brown to very dark brown; 

 antennae 7-jointed; eggs pink (on Robinia pseudacacia, Mesilla Valley, N. M.) 



robinice (townsend) 

 Female 3 to 5 mm. long, 3 to 4 wide, very convex, brown; antennae 7-jointed (Colorado 



and New Mexico, on oak, rose, etc.) ..... quercitronis (fitch) 

 Female 4 mm. or more long, about 2 J high, not so convex as the other species; antennas 



6- or 7-jointed (on fruit trees, introduced.) . . armenmcum (craw) 



Note. — In Kansas are found E. aurantiacicm (Hunter), on osage-orange; E. cana- 

 dense (Ckll.) on elm, etc.; E. cockerelli (Hunter) on elm, oak, walnut, etc.; and E. kan- 

 sasense (Hunter), on Cercis. 



DIASPINiE 



Scale of female circular ........... 1 



Scale of female elongated .......... 4 



1 . Male scale white, elongated, with the exuvia at one end 1 . . . Diaspis, costa 

 Male scale not or not greatly elongated, similar in texture to that of the female 



though much smaller, usually dark-colored if the female scale is dark . . 2 



2. Female with elongated chitinous processes extending inwards from the bases of 



the caudal lobes ....... Chrysomphalus, ashmead 



Female with chitinous processes or thickenings at the bases of the lobes short or 

 absent ............. 3 



3. Circumgenital glands always absent; male scale more elongated Targionia, signoret 

 Circumgenital glands usually present; male scale oval or circular Aspidiotus, bouche 



4. Scale of male white, parallel-sided, like that of Diaspis, and usually longitudinally 



keeled; scale of female white, except the exuviae . Chionaspis, signoret 



Scale of male similar in texture and color to that of the female, not keeled; scale 

 of female mytiliform ....... Lepidosaphes, shimer 



Scale of female brown, not unlike that of a Lepidosaphes; but whereas in Lepido- 

 saphes there are two exuviae at the narrow end, there is here only one, the 

 apparent scale consisting of the greatly enlarged second exuvia 



Fiorinia, targioni-tozzetti 



DIASPIS, costa 

 On oak trees in southern New Mexico ..... montana (ckxl.) 



On Opuntia in New Mexico ..... echinocacti cacti (comstock) 



On greenhouse palms at Denver, Colorado . . . boisduvalii, signoret 



1 In some forms of Targionia the male scale could be taken for that of Diaspis, but it has no trace of the 

 longitudinal keel or keels present in the latter genus. 



