56 OHIO STATE ACADEMY OF SCIENCE. 



Subgenus HEMIBERLESIA Ckll. (Type, A. rapax Comst.j 

 Referring to Eemiherlesia Prof. Cockerell says in Bull. U. S. 

 Dep. Ag., t. s. No. 6.; — "This subgenus really represents a 

 southern modification of Diaspidiotus. with a convex scale and 

 large median lobes, the others being suppressed. It appears to 

 be exclusively American, and belongs to the tropical and Lower 

 Austral regions, except that one species {A. convexiis) occurs in 

 the upper Sonoran, and another (A. ulnii) in the corresponding 

 -Zone in Illinois." Four species are reported for Ohio, A. ulmi 

 being the only native species. 



A. Groups of circumgenital gland-orifices present, 



B. Plates long and complex; first and second plates from 



median lobes wide and multi-branched; third, fourth 

 and fifth narrower and simpler. Two incisions in 

 margin of segment cydoniae crawii 



BB. Two or three plate-like extensions of the segment 

 outside of incisions; a small incision laterad of 

 second incision lataniae 



AA. Groups of circumgenital gland-orifices absent, 



C. Median lobes broad, notched on inner and outer margins; 



inner chitinous process of first incision very long and 

 clavate; plates long and spine-like ulmi 



CC. Median lobes sharply notched near apex; plates toothed 



and branched, chitinous processes subequal rapax 



Subgenus DIASPIDIOTUS (Berl. & Leon.) (Type A. ancylus Putn.) 



The members of this subgenus belong to the North temperate 

 zone, occuring mostly on deciduous trees. The scale is usually 

 dark-colored and the exuviae are covered with secretion. The 

 median lobes arc approximate and the margins of the incisions 

 are thickened. In Ohio, eight species of this subgenus are re- 

 ported. 



A. Posterior segment of female with short, simple, incon- 



spicuous plates. 



B. With second lobe rudimentary or wanting, orange ex- 



uviae ancylus 



With second lobe rudimentary, orange exuviae -cov- 

 ered with black secretion piceus 

 BB. Second lobe slightly developed uvae 

 BBB. Inner angle of second lobe decidedly developed. 



C. Median lobes of medium length, usually notched on outer, 



m:".rgin. 



