1920.] NATURAL SCIENCES OF PHILADELPHIA. 337 



AMERICAN DERMAPTERA OF THE MUSEUM NATIONAL D'HISTOIRE 



NATURELLE, PARIS, FRANCE. 



BY MORGAN HEBARD. 



The series here treated was recently forwarded for determination 

 by Monsieur Lucien Berland, of the Paris Museum. Though in- 

 cluding but one hundred and seven specimens, the collection has 

 been found to have represented in it a number of little-known as well 

 as undescribed forms, well worth reporting as a contribution to the 

 knowledge of the American Dermaptera. 



The series has been returned to the Paris Museum, with the ex- 

 ception of a few duplicates now in the collection of the author, de- 

 posited at The Academy of Natural Sciences of Philadelphia. 



Thirty-six species are represented. Of the new species described, 

 one is from Guatemala, three from French Guiana and one from 

 Argentina. 



PYGIDICRANIDAE . 

 PYGIDICRANINAE. 



Fygidicrana bivittata Erichson. 



1848. Pygidicrana bivittata Erichson in Schomberg, Reisen in Brit. Guiana, 

 III, p. 579. [British Guiana.] 



St. Jean du Maroni, French Guiana, IV to V, 1914, 1 juv. 



The present determination is made with some uncertainty, as 

 the immature example before us (length, exclusive of forceps, 11.3 

 mm.) has the pronotum heavily suffused with blackish, being pale 

 only in a medio-longitudinal line and along the lateral and caudal 

 margins. The difference from the original description may be due 

 to individual intensification of color pattern, or an undescribed 

 species may be represented. 



The head, mesonotum, metanotum and abdomen are black, ex- 

 cept the four proximal abdominal tergites, which are buffy in a 

 broad median section. The limbs are buffy, with the femora suf- 

 fused with black ventrad on their cephalic faces. The forceps are 

 long (3.7 mm.), straight and slender, subadjacent to their sharply 

 incurved and acute apices, with internal margin microscopicall}^ 

 serrulate. 



