MORGAN IIEBARD 
317 
C. Pygidium convex; about as long as broad; lateral margins with 
minute nodes, strongly convergent to acute-angulate produced and 
slightly divergent latero-caudal projections, which occupy the entire 
narrow distal margin. Labia annulata (Fabricius) 
CC. Pygidium convex; distinctly shorter than broad; lateral margins 
smooth, subparallel, very feebly convergent to minute, acute latero- 
caudal projections, between which the broad distal margin is transverse. 
Labia arcuata Scudder 
BB. Tegmina and wings reduced, smooth, with very few microscopic 
hairs. (Pygidium elongate, truncate-conical, considerably longer than 
vide; lateral margins smooth, moderately convergent to minute, acute, 
latero-caudal projections, between which the very narrow distal margin is 
transver.se. Labia rotundata Scudder 
The Ciirvicauda Group 
The single species of this group found in America is readily 
distinguished by the characters given in the preceding keys.^^ 
Labia curvicauda (MotschuLsky) 
1863. Forficelisa cunncauda Motschulsky, Bull. Soc. Nat. Moscou, xxxvi, pt. 
ii, p. 2, pi. II, fig. 1. [Nura-Ellia Mountains, Ceylon.] 
This cosmopolitan species, representing an Old World group, 
shows numerous distinctive differences from the members of the 
Annulata and Dorsalis Groups, to the species of which, however, 
it bears a general superficial similarity. 
Paraiso, Canal Zone, Panama, I, 1 to IV, 25, 1911, (Schwarz), 
1 cf, 3 9. 
Corozal, C. Z. Pan., XI, 17, 1913, (Hebard), 1 cf . 
The Annulata Group 
The present group includes the species annulata, arcuata, 
conspicua^- and rotundata. From the literature, it does not ap- 
This is determined from the type, from Mexico, in the Museum of Com- 
parative Zoology Collection, and two females from the National Museum, one 
from Orizaba, Vera Cruz, Mexico, the other without definite data but appar- 
ently from Mexico. 
Burr’s failure to recognize or assign correctly the majority of the smaller 
forms of the American Labiinae is well demonstrated by his disposition of 
material of the present insect. He determined correctly material of both 
se.xes from Long Key, Florida, in 1910, but that same year recorded from 
Cayamas, Cuba, a male as Labia trinUalis and females as Labia unidentata. 
22 A single specimen from Costa Rica before us, represents either this insect 
or a very closely related species. We have in hand series of the other species, 
including the unique types of arcuata (male) and rotundata (female). 
TRANS. AM. ENT. SOC., XLIII. 
