EMIBTOPTEHA OF THE NEW WOKLD — ROSiS 437 



pigmented bands. One cross vein present between Ri and II0+3 in 

 forewings and hindwings, this located just beyond basal third of 

 Rg+s- Hyaline stripes narrow, sharply defined. 



Hind basitarsi with only one sole-bladder; ventral setae dense, long. 



Terminalia (fig. 62, 63) relatively small, nearly symmetrical, weakly 

 sclerotized and pigmented. Tenth tergite broadly triangular, divided 

 submedially by a cleft, which becomes obsolete well before base of 

 tergite, and forms two unequal hemitergites ; left hemitergite (10 L) 

 smallest, abruptly produced caudally on inner side as a narrow, acu- 

 minate, simple process (10 LP) ; right hemitergite (10 R) broad, 

 large, gradually produced caudad as a broad, nearly parallel-sided 

 process (10 RPi), which is truncate, curved downward, and minutely 

 hooked inward at apex; the inner margins of the two processes are 

 nearly straight and closely parallel. Margin of basal half of 10 RPi 

 with a narrow, simple, detached appendix (10 RPo). Ninth sternite 

 (H) greatly desclerotized, pigmented only across base and along 

 left side, otherwise membranous; process (HP) obsolete, represented 

 only as a membranous lobe, faintly pigmented on left side. Left 

 paraproct (LPPT) elongate, inner margin lying close to margins of 

 H and HP, outer margin irregular; right paraproct (RPPT) repre- 

 sented only as faintly pigmented, weakly wrinkled areas in membrane. 

 Left cercus with basal segment (LC^) unspecialized, cylindrical, with- 

 out lobes or echinulations, slightly tapered distally, outer apical half 

 membranous; a small sclerotized area at outer base may represent 

 the left cercus basipodite (LCB?) fused to the cercus; terminal seg- 

 ment elongate, cylindrical, simple; right cercus similar to left cercus, 

 the basal segment only slightly less pigmented. 



Female. — Unknown. 



Holotype.—M^lQ^ on slide, U.S.N.M. No. 56759. 



Type data. — Rio Frio, Colombia, February (W. M. Mann). 



Remarks. — This remarkable species is tentatively assigned to Saus- 

 stirembia Davis on the basis of its unmodified, nonechinulate left 

 cercus. It may be separated at once from Saussurembia mf.collis 

 (Saussure) by its incompletely cleft tenth tergite, the narrow left 

 process (10 LP), the desclerotized ninth sternite, and the distally 

 tapered LC^. 



The abdominal terminalia of symmetrica are the most unspecialized 

 of the Anisembiidae and rank with those of Clothoda as the most gen- 

 eralized of the order. They represent one more element in the pleas- 

 ing phylogenetic series found in the Anisembiidae. 



Genus MESEMBIA Ross 



Mesemhia Ross, 1940a, p. 12.— DA\^s, 1940d, p. 532.— Ross, 1940b, p. 643. 

 Genotype. — Oligotoma hospes Myers, by original designation. 

 Distribution. — West Lidies, Brazil. 



