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PROCEEDINGS OF THE NATIONAL MUSEUM 



Vol. 117 



Male genitalia (slide 10174) : The parallel-edged harpe, lacking 

 the dorsal and ventral processes, distinguishes this species from other 

 members of the genus. The broad, truncate vinculum is not found 

 elsewhere in the known species of this genus. 



Female genitalia (slides 10175, 10176): The extreme development 

 of the sclerotized covering of the ostium, common in crambids, is 

 unusual and easily distinguishes females of truncus from other species, 

 except oxyechus. 



Figures 15-16. — Fernandocrambus truncus, new species: 15, ventral view of male genitalia 

 with left harpe and aedeagus removed; 15a, aedeagus; 16, ventral view of female genitalia; 

 16a, lateral view of genital plate and ostium showing posterior part of ductus bursae and 

 inception of ductus seminalis. 



Type: Masatierra: Bahia Cumberland (Feb. 15, 1951). 



Described from the male type and 8 male and 10 female paratypes 

 as follows: Masatierra: Bahia Cumberland, Scfcf , 9 99 (January, 

 February, and March dates, 1951-1955); Plazoleta del Yunque, 

 200 m., 9 (Dec. 28, 1954). 



Similar to bdckstromi but averaging a little smaller and with a 



