1921] NATURAL SCIENCEft OF PHILADELPHIA. 295 



In addition to the type, two paratypic males are at hand, dne 

 from Averias, Rio Salado, Santiago del Estero, Argentina, taken in 

 April, the other from Icano, Rio Salado, Santiago del Estero, 

 Argentina. 



Ceuthobia fulvella (Rehu) 



1913. Melestora fulvella Rehn, Proc. Acad. Nat. Sci. Phila., 1913, p. 283, 

 fig. 3. [c?; Misiones, Argentina.] 



Carcarana, Santa Fe, Argentina, 5 cT, [Hebard Cln. ]. 



The present specimens are so much smaller than the type that 

 we at first believed a distinct species to be represented. Careful 

 examination shows, however, that no feature of sufficient impor- 

 tance occurs to warrant separation. 



The specialization of the median segment of the male abdomen 

 is the same as described for C. lepta on page 294. The male sub- 

 genital plate was not originally described. It is asymmetrical, 

 with sinistral margin weakly oblique and feebly concave to beyond 

 the mesal point, supplied at end of proximal third with a minute, 

 simple, straight style, set in a socket; dextral margin almost straight, 

 produced, showing slight convexity distad and there terminating at 

 apex of plate in a large socket, in which is set the dextral style; 

 this style rounded, with a slender, elongate spine dextrad which 

 curves sinistrad and at its base sinistro-caudad another similar spine 

 of about half the length. The material here recorded agrees with 

 the type in this and all other features, except size and a very slightly 

 gi'eater interocular width. 



Length of body 5.5-6, length of pronotum 1.3-1.3, wddth of 

 pronotum 1.8-1.8, length of tegmen 5.9-6.2, width of tegmen 1.85- 

 1.9 mm. 



LANTA new genus. 



This genus includes two previously unknown Argentinian species. 

 Nearest relationship is with Ceuthobia, males agreeing in the small 

 size, moderately wide and not wrinkled interocular area, compara- 

 tively large ocellar areas, general form and contour of pronotum, 

 sinistral tegmen without a diagonal channel, generally longitudinal 

 character of discoidal sectors, wings of similar general proportions 

 with radiate field folding fan-wise, absence of pulvilli and presence 

 of well developed arolia. 



It differs in the more regular tegminal venation with discoidal 

 sectors all parallel to each other but weakly oblique to the sutural 

 margin, wings wdth more numerous costal veins which are thickened 

 (not clubbed) distad, smaller intercalated triangle, unspeciafized 



