1921] NATURAL SCIENCES OF PHILADELPHIA. 299 



margins of which are subchitinous. Sinistral style simple, straight, 

 cylindrical, about four times as long as basal width, tapering to the 

 rounded apex; dextral style represented by a brush of agglutinated 

 spiniform hairs, nearly as wide as the length of the sinistral style, 

 the median length of these hairs slightly shorter than the width of 

 the brush, this brush springing from the dorsal surface of the plate 

 just within the free margin. 



General coloration deep bister. Head blackish chestnut brown; 

 ocelli light buff; proximal antennal joints, palpi and mouthparts 

 prouts brown, remaining portions of antennae buckthorn brown 

 tinged with tawny. Pronotum deep bister. Tegmina weakly 

 transparent, heavily and evenly suffused with saccardos umber, 

 except in portion of dextral tegmen concealed when at rest, which 

 is hyaline, transparent, the wing beneath showing whitish. Wings 

 transparent, almost colorless, except area of costal veins and dis- 

 tal margin of anterior field, where they are strongly suffused with 

 saccardos umber. Abdomen, underparts and limbs dresden brown, 

 the abdomen deepening to prouts brown distad. 



Length of body 6, length of pronotum 1.7, width of pronotum 2, 

 length of tegmen 5.9, width of tegmen 2.3, length of wing 5.5, width 

 of wing 3.7 mm. 



The type is unique. 



Melestora argentina (Relm) Plate XIV, figures 9 and 10. 



1915. Latindia argentina Kehn, Proc. Acad. Nat. Sci. Phila., 1915, p. 276, 

 figs. 2 and 3. [cf ; Misiones, Argsntina.] 



Falls of the Rio Iguazu, Misiones, Argentina, 1 cf. 



The present insect would appear to be extremely close to M. 

 fuscella Stal. Examination of the type, or material from Rio de 

 Janeiro, Brazil, is necessary before the validity of argentina, or its 

 synonymy, can be established. We have discussed the genus 

 Melestora on page 250 of the present paper. 



PERISPHAERINAE. 



Parahormetica tumulosa Bninner 



1865. P[arahormetica] tumulosa Brunner, Xouv. Syst. Blatt., p. 385, pi. XII, 

 figs A to c'. [cf , 9 ; Brazil.] 



Villa Lutecia, near San Ignacio, Misiones, Argentina, January 

 to April, 19,4 juv. 



In this adult, as well as in those recorded on page 254, the teg- 

 mina are immaculate. The present material is there further dis- 

 cussed. 



The following list shows the linear arrangement of the species 

 treated in this paper. It is furnished as an aid to the student, 

 particularly in finding the position of the new genera and species 



