64 U.S. NATIONAL MUSEUM BULLETIN 261 



Female abdominal sternum VII very narrow, produced, triangular, 

 exposing the first valvifer at each side. Color of anterior dorsum dull 

 brown, forewings dull brown with vague darker markings, with one or 

 two pale orange spots in clavus near base, and irregular vermiculate 

 transverse markings in corium, sometimes interrupted, also orange. 



Holotype male with labels "Roches de Kourou/Guyane Francse/ 

 Collection Le Moult" and "Coll. 1," on indefinite loan to USNM from 

 NCS and three female specimens, same data (NCS). 



This species is closely related to Af. guerini (Signoret) but difi"ers in 

 the bizzarre modification of the style apex in M. curuna and the very 

 short aedeagal shaft in guerini. 



Mareba panamensis, new species 

 Figure 47 



Length 16 mm. Head with median length considerably exceeding 

 transocular width, without a distinct M -shaped elevation bordering 

 posterior margin. Forewings with veins very indistinct almost as far 

 posteriorly as claval apex, clavus without pits. Male pygofer more 

 produced than in M. curuna, new species, not broadly truncate apically, 

 with lower margin irregularly oblique; plates in lateral aspect ex- 

 tending not nearly as far posteriorly as posterior pygofer margin, in 

 ventral aspect with apices broadly rounded; styles truncate apically, 

 without a broad apical expansion; aedeagus with shaft not nearly as 

 long as basal processes. Color dull brown, the forewings with apical 

 third black. 



Holotype male with labels "Cerro Campana/Pan 1-VIII 1951" and 

 "F. S. Blanton/Collector," in USNM. 



This species is closely related to M. eresia Distant, but differs from the 

 Distant species in that the latter has a roimded aedeagal apex whereas 

 M. panamensis has a concave aedeagal apex. 



9. VKOCOlSiOBOLA, new genus 



Figures 51-53 



Type-species : Amblydisca callidula Jacobi. 



Length 13-14 mm. 



Head well-produced, median length equal to or less than interocular 

 width, anterior margin broadly rounded in dorsal aspect (exception: 

 P. nodosula (Melichar)), anterior margin with a carina at transition 

 from crown to face, disc with a full-length median fovea extending 

 between elevated anterior and posterior margins, with a conspicuous 

 M -shaped elevation bordering posterior margin, with a longitudinal 



