1917.] NATURAL SCIENCES OF PHILADELPHIA. 243 



Prolabia modesta (Bnmer). 



190G. Labia modesla Briiner, Jour. N. Y. Ent. Soc, XIV, p. 137.2i 

 [Trinidad.] 



The unique female type of this species is now before us and is 

 found to represent a species of the Unidentata Group of the genus 

 Prolabia. 



It shows very close relationship to the recently described Prolabia 

 dominicce Hebard, differing from females of that species in the 

 decidedly larger size, exposed portion of wings with a large proximo- 

 external yellowish huffy spot and ultimate dorsal abdominal segment 

 with a few minute rugae in the medio-distal depressed area, before 

 the marginal row of minute rugse, which row is broken mesad. The 

 males will probably show much more decided differences between 

 these species. 



The measurements of this type are: length of body 7.5, of pronotum 

 1.2, of tegmen 2.1, of exposed portion of wing 1.4, of forceps 2.2; 

 width of pronotum 1.15, greatest width of abdomen 1.8 mm. 



Both modesta and dominicce are distinctive in the females having 

 no large, blunt, dorso-proximal projection on the internal face of 

 the forceps. 



Prolabia ascensionis new species. PI. XVI, figs. S, 9. 



This small insect, which is shining reddish brown with a pale spot 

 on the exposed portion of each wing, is of the characteristic color 

 type of the Unidentata Group of the genus Labia and of numerous 

 species of the Spongiphorince. 



The male pygidium is quadrate as in P. arachidis, but with distal 

 portion differently sculptured and the forceps, though bidentate, 

 much as is normal in that species, are less flattened. ' The insect is 

 smaller and distinctly less robust than arachidis and does not have 

 the befouled, greasy appearance of that insect. 



Type: cf ; Ascension Island, South Atlantic. [Museum of Com- 

 parative Zoology.] 



Size rather small; form moderately robust, but not nearly as robust 

 as arachidis. Head much as in that species, sutures subobsolete. 

 Antennae (in series with eleven to thirteen joints), with third about 

 equal in length to first, fourth slightly over half as long as third; 



21 Professor Bruner has very kindly sent for examination the types of the 

 species of Dermaptera described by him in this paper. The synonymy will be 

 discussed under the species involved, in the series of dermapterological studies 

 about to appear, the names being assignable as follows: 



Labia modesta = Prolabia modesta (Bruner). 



Labia pictipennis = Spandex percheron (Guerin and Pereheron). 



Labia insularis = Vostox brunneipennis fServille). 



Labia trinitatis = Labia dorsalis (Burmeister). 



