56 OHIO STATE ACADEMY OF SCIENCE. 
Subgenus HEMIBERLESIA Ckll. (Type, A. rapax Comst.) 
Referring to Hemiberlesia 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 exciusively American, and belongs to the tropical and Lower 
Austral regions, except that one species (A. converus) occurs 
the upper Sonoran, and another (4. wim) in the corresponding 
zone in Ilinois.”’ 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 cr 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. ‘he scale is usually 
dark-colored and the exuviae are covered with secretion. The 
median lobes are 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. 
Cc. Median lobes of medium length, usually notched on outer 
mcrgin. 
