316 
PANAMA DERMAPTERA 
C. Forceps simple, without a tooth. Pygidium declivent; surface 
convex; much broader than long; distal margin concave, with disto- 
lateral angles bluntly rounded. Lateral productions and keels of 
eighth and ninth dorsal abdominal segments very weak. 
Labia annulata (Fabricius) 
CC. Forceps excavate in median internal portion, with a ventro-intemal 
tooth. Pygidium declivent; surface subdeplanate; broader than long; 
disto-lateral angles sharply acute-angulate produced with intervening 
portion of distal margin transverse. Lateral productions and keels of 
eighth and ninth dorsal abdominal segments weak. 
Labia arcuata Scudder 
BB. Abdomen with fifth to ninth dorsal segments produced or keeled 
laterad. Tegmina and wings smooth, with very few microscopic hairs. 
C. Tegmina and wings reduced. Abdomen w'ith fifth to ninth dorsal 
segments moderately produced but not keeled laterad. Forceps simple, 
without a tooth. Pygidium declivent; surface subdeplanate; lateral 
margins rather decidedly concave convergent to the moderately broad 
and bluntly rounded disto-lateral portions, between which the distal 
margin is deeply and narrowly arcuato-concave.^^ 
Labia rotundata Scudder 
CC. Tegmina and wings fully developed. Abdomen with fifth to 
ninth dorsal segments strongly produced and keeled laterad, fourth 
segment moderately produced. Forceps simple, with a minute ventro- 
intemal tooth at end of proximal third. Pygidium declivent; surface 
subdeplanate; lateral margins feebly convex convergent to minute 
disto-lateral knob-like projections, between which the rather narrow 
distal margin is transverse, feebly concave. 
Labia dorsalis (Burmeister) 
Key to fe7nales 
(Abdomen with numerous microscopic hairs and fewer longer hairs.) 
A. Forceps simple, heavy, subtriquetrous, ventro-intemal margins attingent. 
(Pygidium inset between bases of forceps. Tegmina and wings fully devel- 
oped.) 
B. Size minute. Tegmina and wings thickly supplied with microscopic 
hairs. Forceps with lamellate ventro-intemal margin with smooth edge. 
Pygidium shield-shaped, with lateral margins convex convergent. 
Labia curvicauda (Motschulsky) 
BB. Size very small. Tegmina and wings smooth, with very few micro- 
scopic hairs. Forceps with lamellate ventro-intemal margin with edge 
• showing some blunt serrations. Pygidium bluntly triangular, with lateral 
margins straight convergent. Labia dorsalis (Burmeister) 
AA. Forceps simple, slender, cylindrical, well separated. (Size very small.) 
B. Tegmina and wings fully developed, thickly supplied with micro- 
scopic hairs. 
This is determined from a single male before us, with no definite data but 
apparently from Mexico, in the National Museum Collection. 
