EIMBTOPTERA OF THE NEW WORLD ROSS 435 



Members of this family can be separated from other American 

 species, which have the wing vein R^+5 simple, by the nonclentate 

 mandibles and the usually clavate and echinulate left cercus. 



With the discovery of a species of Chelicerca (described below) hav- 

 ing the left cercus of the male two-segmented, the division of the 

 family into two subfamilies on the basis of segmentation of the cer- 

 cus becomes untenable (i. e., Mesembiinae, left cercus two-segmented, 

 and Anisembiinae, left cercus one-segmented). 



KEY TO GENERA OF ANISEMBIIDAE (MALES) 



1. Basal segment of left cercus apically echinulate on inner side 2 



Basal segment of left cercus not echinulate Saussvirembia 



2. Left cercus usually 1-segmented ; when 2-segmented terminal segment broadly 



attached basally and not equal in form to terminal segment of right 



cercus 4 



Left cercus always 2-segmented, terminal segment similar to that of right 

 cercus in form and basal attachment '. 8 



3. Terminalia with processes of tenth tergite slender, unarmed; median cleft 



of tenth tergite narrow: process of hypandrium (H) small, trun- 

 cate Mesembia 



Processes of tenth tergite broad, rounded, often bearing small hooks; median 

 cleft of tenth tergite usually very broad (when nurruw, it Is basally 

 forked), membranous; process of hypandrium prominent, broad, thumb- 

 like Schizembia 



4. Basal segment of right cercus cylindrical, not expanded basally, basal fora- 



men simple; process of left hemitergite simple Anisembia 



Basal segment of right cercus somewhat laterally compressed, greatly ex- 

 panded basally to form a complexly margined foramen ; process of left 

 hemitergite complex Chelicerca 



Genus SAUSSUREMBIA Davis 



Snussuremhia Davis, 1940a, p. 191. — Ross, 1940b, p. 647. 

 SaussureUa Davis, 1930d, p. 573 (name preoccupied). 



Genotype. — Emhia ruflcoUis Saussure, by original designation.*^ 



Distribution. — Central America and Colombia. 



This genus comprises two species, which may be separated from all 

 others of the family by the nonechinulate left cercus. The writer now 

 has evidence that Oligotoma venosa Banks, of Cuba, recently placed 

 in this genus by Davis, belongs in Anisemhia (see infra). 



SAUSSUREMBIA RUFICOLLIS (Saussure) 



Emhia ruficollis Saussure, 1896b, p. 353. 



Oligotoma i'KfieoUis (Saussure) Krauss, 1911, p. 42, pi. 2, fig. 10. — Enderleim. 



1912, p. 91.— Navas, 1924b, p. 62, fig. 4.**— Friederichs, 1934, p. 417, fig. 6, 



a-b.* 

 SaussureUa nificoUis (Saussure) Davis, 1939d, p. 573, figs. 1-4.** 

 Saussnremdia ruficollis (Saussure) Davis, 1940a, p. 191. 



* Davis's concept of this species was based on a specimen, in the Paris Museum, from 

 Costa Rica (Paul Serre, 1920). 



