1952] 
Feldman and Bailey — Corythucha 
99 
responding first valve by a slide and groove arrangement. 
The second valvifer is an oblong plate lying lateral 
and somewhat dorsal to the first valve. Its proximal end 
fits snugly posterior to the ramus of the first valve. At the 
distal end of the second valvifer is a much reduced third 
valve. 
In all cases valve one is measured from the most 
proximal part of its ramus to the distal end of the valve. 
Valve two is measured from the common base to the distal 
end. 
0.5 MM. 
Fig. 18. Ovipositor of Corythucha heidemanni Drake in ventral aspect. 
(VI 1) valve one, (VI 2) valve two, (VI 3) valve three, (Vlf 1) valvifer 
one, (Vlf 2) valvifer two, (S-P) subgenital plate, (R1 1) ramus of 
valve one. 
C. arcuata (Say) 
The length of valve one varies from 0.29-0.33 mm. 
and its average length is 0.31 mm. Valve two varies in 
length from 0.25-0.28 mm. with an average length of 0.26 
mm. The shape of valve two is triangular from the ventral 
aspect (fig. 6). On the basis of the shape of valve two, this 
species can readily be differentiated from all other species 
studied with the exception of C. mollicula. The second 
valves of these two species are identical. The subgenital 
plate is circular. 
