18 PROCEEDINGS OF THE NATIONAL MUSEUM Vol. 117 



cucullus; aedeagus long, slender; vesica armed with a single hooklike 

 cornutus. 



Female genitalia (slide 10145): Ductus bursae sclerotized in 

 posterior three-fifths. Ventral Up of ostium long, slender, spoon 

 shaped. Ductus seminalis as indicated in figiu-e. 



Type: Masatierra: Bahia Cumberland (Jan. 3, 1952). 



Described from the type male and 37 male and female para types, 

 all from the same locality. December and January to March dates! 



Superficially, arcus is similar to fuscus but it is a much larger insect. 

 The strong, curved process of the sacculus and the stout hook of the 

 aedeagus oijuscus immediately separate it from arcus. 



Fernandocrambus corviis, new species 



Figure 12 

 Alar expanse 26 mm. 



Labial palpus buff, irrorate with sordid whitish and fuscous. 

 Antenna fuscous with buff annulations. Head buff above, shading 

 to fuscous on frons. Thorax and ground color of forewing grayish 

 buff; thorax and tegula fuscous anteriorly; base of costa and a fine 

 along fold to basal third, fuscous; from costa, shghtly beyond middle, 

 an indistinct fuscous fine curves to about two-thirds distance across 

 wing; from apical fourth of costa a fuscous fine extends obhquely and 

 outwardly to vein 6, then angles inwardly straight to tornus; on 

 dorsum, between the two transverse lines, a conspicuous blackish- 

 fuscous dash; along termen, at the ends of the veins, a series of small 

 fuscous spots; entire surface of wing sparsely irrorate with fuscous; 

 cilia grayish buff. Hindwing shining pale ocherous white; from costa 

 to vein 2, an ill-defined, outwardly curved lunate fine; cilia ocherous 

 white. Legs buff, somewhat shaded with fuscous; tarsi shaded with 

 blackish fuscous on outer surface. Abdomen pale buff above, suffused 

 with fuscous beneath. 



Female genitalia (shde 10648) : Ovipositor lobes edged with a row 

 of strong setae. Ventral hp of ostium produced as a long, slender, 

 strapHke process. Shghtly more than posterior half of ductus bursae 

 sclerotized; inception of ductus seminaHs at junction of sclerotized 

 portion of membranous anterior part of ductus bursae. 



Type: Masatierra (no definite locaHty or date). 



Described from the unique female type, in slightly damaged 

 condition. The genitaha of corviis are very similar to those of arcus 

 but exhibit several substantial differences. The setae along the distal 

 edges of the ovipositor lobes are coarse and stout in corvv^, not so 

 much so in arcus; the posterior edge of the genital plate of corvu^ is 

 straight but that of arcus is concave; the sclerite anterior to the ostium 

 is nearly twice as large in corvus as it is in arcu^. In general, the 



