68 U.S. NATIONAL MUSEUM BULLETIN 244 



Discussion. — The outer convergence and separation of Sc+Ri and 

 Rs in the secondaries is possibly, but not probably, attributable to 

 intraspecific variation. The precise definition of this character will 

 have to await further collecting of the species. In addition to this 

 venational feature, L. haitiensis can be separated from L. kunckelii, 

 which it most resembles, by a distinctly different eighth sternite and 

 by the relatively broader primaries. L. haitiensis can be distinguished 

 easily from L. hrasiliensis by the absence of intercalary cells in the 

 wings. 



THE "qUADRIDENTATA" GROUP 



This group is comprised of only two species, Lumacra quadridentata 

 and L. hyalinacra, both of which previously were undescribed. As in 

 the first group, these two species exhibit very similar genitaha, but 

 they differ remarkably in their pattern of scaling. 



Male genitalia. — Vinculum with lower angles not doubled, thus 

 no darker than rest of sclerite; gradually tapering to indistinct saccus. 

 Eighth sternite furcations noticeably more slender than previous 

 group. 



19. Lumacra quadridentata, new species 



Figures 18, 204, 261, 333; Map 9 



Male. — (Fig. 18.) Body and wings fuscous. Antennae 24-27 

 segments. Wings fully scaled. Discal scales (fig. 333) of forewings 

 broadly oblanceolate with variable apices, usually quadridentate; 

 scales over rest of wing also broad and strongly dentate; median vein 

 undivided within cell of both wings. Wing expanse 20-21 mm. 



Male genitalia. — (Fig. 261.) As described for group. 



Case. — Unknown. 



HoLOTYPE. — In the British Museum of Natural History. 



Type locality. — St. Jean de Maroni, French Guiana. 



Recorded hosts. — None. 



Distribution. — (Map 9.) Presently known from the Orinoco 

 Plain of Venezuela, east along the Guiana Coastal Plain to French 

 Guiana. 



Discussion. — This new species is represented presently by only 

 three specimens, consisting of two paratypes (both with abdomens 

 missing) and the holotype (male genitalia on sHde no. 47, DRD). 

 Lumacra quadridentata can readily be separated from the three species 

 of the "hrasiliensis " group by the distinctly different genitalia, and 

 from L. hyalinac7'a in possessing fuUy scaled primaries. It can be 

 further distinguished from most members of this genus by the char- 

 acteristic dentate scaling in the discal cell which the specific name has 

 indicated. 



Material examined. — 3 d^ cf : 



