366 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



Scale of male: Length i-i.2mm. ; white, exuviae brown or 

 nearly colorless, sides parallel, slightly broadened posteriorly, 

 distinctly but feebly tricarinated. 



The usual host plants are poplar and willow, but this scale is 

 found occasionally on Liriodendron, Cornus and Amelanchier. 



Recorded from Massachusetts and New York. 



Another species, C. spartinae Comstock, has been recorded from 

 Massachusetts. Specimens and description are not available. 



Hemichionaspis Cockerell. 



Only one species of this genus has been recognized in our 

 territory and this is usually found on the leaves of plants in 

 greenhouses. 



H. aspidistrae (Signoret). Chionaspis aspidistrae. Chionaspis 

 brasiliensis. Chionaspis latus. (PL xv, 2.) 



Ann. Soc. Ent. Fr., ix, 443, 1869. 



Scale of female: Length 1.8-2,6 mm. ; pale brown exuviae of 

 same color ; rather broadly pyrif orm with posterior extremity well 

 rounded. 



Female: Median lobes with three notches on outer margins. 

 Median group of circumgenital gland-orifices 5-15 ; anterior lateral 

 15-22; posterior lateral 17-23. 



Scale of male: Length 1-1.3 mm. ; white, exuviae bright yellow, 

 sides parallel, tricarinated. 



On orchids, ferns and tropical plants in greenhouses. 



Milford, 12 March, 1909, 2 Feb., 1922; Cromwell, 19 Jan., 1910. 



Diaspis Costa. 



Female scale nearly circular, white or light gray, exuviae nearly 

 central, or at least well within the margin. Only one species 

 {zamicue) is without circumgenital gland-orifices, and one (echin- 

 ocacti cacti) has a male scale which is not tricarinate. 



Key to Species. 



1. Pygidium of female with five groups of circumgenital gland-orifices 2 

 Pygidium without grouped circumgenital gland-orifices zamiae 



2. Inner margins of median lobes serrate 3 



Median lobes small ; not serrate 4 



3. Thoracic segment with large projecting tubercle on either side; 



median lobes diverging; large inner margins strongly curved, 



sharply serrate boisduvalii 



Thoracic tubercle wanting; median lobes smaller diverging, inner 

 margins nearly straight, serrate bromeliae 



4. Posterior group of circumgenital gland-orifices usually of more 



than twelve echinocacti cacti 



Posterior group of circumgenital gland-orifices usually from seven 

 to nine carueli 



