320 
PANAMA DERMAPTERA 
Though the present series shows decided size and color varia- 
tion, very little individual variation is found in hairy covering, 
lateral production of male dorsal abdominal segments or in the 
P3^gidium and forceps. 
The Dorsalis Group 
The present group includes the species dorsalis and cyanescens.^^ 
Under the Annulata Group comparisons are made and the species 
discussed. 
Labia dorsalis (Burmeister) 
1838. F[orficula] dorsalis Burmeister, Handb. Ent., ii, abth. ii, pt. i, p. 754. 
[Colombia.] 
1864. L[abia] chalybea Dohrn,*^ Stett. Ent. Zeit., xxv, p. 429. [Venezuela.] 
1906. Labia Irinitatis Bruner, Journ. N. Y. Ent. Soc., xiv, p. 136. [Trinidad.] 
Cabima, Panama, V, 22, 1911, (Busck), 1 9. 
Porto Bello, Pan., 1 cf, 2 9- 
As indicated in the last footnote, the name chalybea appears to 
be, at least in part, founded on material of the species previously 
described as dorsalis. Professor Bruner has very kindly sent us 
for examination the types of irinitatis, which agree in everj^ 
structural feature with the Panamanian series assigned with little 
doubt to dorsalis. 
The Panamanian male has the dorsal abdominal surface black- 
ish with distal segment and forceps pale yellowish, the tegmina 
and wings strongly metallic; that from Trinidad has the dorsal 
surface of the abdomen and the forceps dark reddish brown as 
in the females before us, the tegmina and wings less striking!}’- 
metallic. The Mexican males are even more obscurely colored. 
Little definite can be said of this interesting species until much 
larger series are collected. It is clear that very great color vari- 
ation occurs. 
Measurements {in millimeters) 
^ Length of Length of Width of Length of Length of 
O body pronotum pronotum tegmen forceps 
Motzorongo, Mexico 6.1 .88 . 88 1.84 1.16 
Motzorongo, Mexico 5.1 .88 .88 1.7 1.09 
As far as we are able to determine from the description of that species. 
The description does not fully agree and may have been compiled from 
examples of several species; the female with forceps “ zusammenliegend ” is 
almost assuredly the present species. Burr’s discussion of the portion of the 
type series belonging to the Vienna Museum offers little assistance. 
