138 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 93 



Food plant. — Unknown. 



Distribution.— United States: Arizona, Cochise County (July, 

 Aug., Sept.), Gila County (July), Graham County (June). 



Twenty-seven specimens examined. 



Remarks.— Collection dates indicate that typical sesquUinearia ap- 

 pears in the spring and early part of summer and that cavillaria is 

 in flight from midsummer until fall (the periods would naturally 

 vary according to the season) . Intergrading forms occur during June 

 and the early part of July. Again the evidence suggests that only 

 seasonal forms are represented by the names but until this is verified 

 by rearings, car Maria should be kept as a variety. 



McDunnough 7 noted the close similarity of sesquUinearia and cavil- 

 laria and the probability of their erroneous generic placement. 



3. BESMA MARILACTA (Dyar) 



Plate 6, Figures 17, 17A ; Plate 10, Figure 35 

 Metanema marilacta Dyab, Proc. U. S. Nat. Mus., vol. 51, p. 27, 1916. 



Male.— Pale whitish ocherous, sparsely sprinkled with testaceous. 

 Resembles sesquUinearia somewhat in habitus and maculation, with 

 the wings more angulate and the transverse lines rather obscure, not 

 sharply defined; outer margins of the wings edged with testaceous 

 scales. 



Alar expanse, 38 mm. 



Genitalia (figs. 17, 17A) somewhat similar to those of sesquUinearia 

 but with harpe stouter, costa more convex and the furca abruptly en- 

 larged distally. 



Female— $\m\\zv to the male in habitus and maculation but with 

 the transverse lines more sharply defined and the posterior line some- 

 what concave inward. 



Alar expanse, 38-40 mm. 



Genitalia (fig. 35) similar to those of sesquUinearia but larger, 

 with the narrow crinkled sclerotized band bordering ventral margin 

 of genital opening more developed, the signum larger and more cir- 

 cular in form. Ventral operculum moderately sclerotized. 



Type.— U.S.N. ,M. No. 18880. 



Type locality. — Zacualpan, Mexico. 



Food plant. — Unknown. 



Distribution. — Mexico: Cuernavaca (June), Zacualpan (Mar., 

 Sept.). 



Three specimens examined. 



Remarks. — The series representing this species in the National Mu- 

 seum collection consists of one male from Zacualpan (March), the 



7 Contr. Nat. Hist. Lepid. North Amer., vol. 3, no. 3, p. 187, 1916. 



