440 PRiOCEE.DIXGS OF THE XATION^AL MUSEUM vol. 94 



MESEMBIA HAITIANA Ross 



Mesembia haitiana Ross, 1940b, p. 646, figs. 17-19. 



Holotype.—WmgQd male, on slide, U.S.N.M. No. 53132. 



Type data. — Grosmore, Haiti, Februarj' 17, 1926 (C. H. Leonard). 



Genus SCHIZEMBIA, new genus 



Males. — Winged; small to moderate sized. Dark chocolate brown; 

 prothorax yellow; wings dark brown. Head without maculation; 

 eyes medium to large sized; mandibles small, without apical denta- 

 tions, tips acutely pointed, inner margins evenly arcuate. Submen- 

 tum quadrate, somewhat longer than broad, not heavily sclerotized; 

 mentum distinct, pigmented. Wings with Ri narrow, closely paral- 

 leling costal margin and meeting it before apex; radial sector, R2+3. 

 Ml and Cuja simple. Hind basitarsi with only one bladder: plantar 

 setae very fine. Terminalia with tenth tergite divided into hemiter- 

 gitesby a suture complete to basal margin; processes of each hemiter- 

 gite short, broad, blunt, complex apically (fused apically in one 

 species). Ninth sternite with a short, broad, rounded process. Com- 

 posite left cercus-basipodite and left paraproct represented by a free 

 triangular sclerite. Left cercus two-segmented; basal segment 

 nodulose and echinulate on inner side apically. Right cercus two- 

 segmented, basal segment cylindrical. 



Female. — No specimens definitely associated with a male. 



Genotype. — Schizenibia grandis., new species. 



Distribution. — Colombia, Venezuela, and Trinidad. This is the 

 only genus of Embioptera, except MesemVia and Saussureiiibia., in- 

 digenous to South America that has oligotomoid wing venation (Rj+s 

 simple).'^ It can be separated at once from the introduced species of 

 Oligotoma., which have similar venation, by its nondentate mandibles, 

 echinulate left cercus, completely cleft tenth tergite, and the blunt, 

 short process of the right hemitergite. 



The three known species of Schizerribia may be separated by means 

 of the following key : 



KEY TO SPECIES OF SCHIZEMBIA (MALES) 



1. Tergal processes separated apically by a broad membranous cleft, wbicb 



continues to base of tergite 2 



Tergal processes fused apically, membranous cleft narrow, Y-shaped, isolating 

 a broad, medial sclerite; Trinidad callani 



2. Size lai-ge (10 mm. long) ; process of hypandrium evenly rounded apically, 



marginal flange, narrow, even grandis 



Size small (6.5 mm. long) ; process of hypandrium acutely pointed apically, 

 marginal flange greatly developed laterally minuta 



"> Galamoclostes alhii<triolatus Enderlein of tlie Eiiibildae has R^^j simple in the forewiug 

 and forked in the hindwing. 



