74 PROCEEDINGS OF THE NATIONAL MUSEUM Vol. 117 



however, removes any doubt about their identity. Had Aurivillius 

 made dissections, he would have seen that he had examples of one 

 extremely variable species. As a matter of fact, there are almost as 

 many color forms as there are specimens but the genitalia are remark- 

 ably constant. 



Male genitalia figured from a specimen from Plazoleta del Yunque 

 (slide 10181). Female genitalia figured from specimens from 

 Quebrada la Laura (slides 10182, 10367). 



Nesochoris, new genus 



Type-species: Nesochoris holographa, new species. 



Antenna ciliate in male (female unknown). Labial palpus porrect, 

 about one-fourth longer than head; third segment less than one-third 

 the length of second, slightly drooping. Head somewhat roughened. 

 Forewing smooth, termen oblique, slightly concave between veins 4 

 and 7; 12 veins, all veins separate; Ic strongly preserved at margin; 

 2 from outer two-thirds of cell; 3, 4, and 5 separate and about equidis- 

 tant at bases; 6, 7, 8 separate and about equidistant at bases, 7 to 

 termen well below apex; 11 from slightly before middle of cell; upper 

 internal vein from between veins 10 and 11. Hindwing with 8 veins; 

 2 from well before end of cell; 3 and 4 connate; 5 approximate to 4; 6 

 and 7 short stalked. 



Male genitalia: Harpe simple, short, broadly attached, gnathos 

 and imcus present; socii obsolete; transtUla indicated by membrane 

 only; anellus a simple plate; vesica armed with weak, slender cornuti. 



Nesochoris and Proeulia are very similar in outward appearance but 

 the male genitalia separate them easily. Proeulia exhibits strongly 

 developed socii and transtilla and strongly fused gnathos. In Neso- 

 choris, however, the socii are indicated by only a few weak setae, the 

 transtilla is practically nonexistent and the lateral and central ele- 

 ments of the gnathos are separate. 



The species of Nesochoris are separated by the following key: 



Alar expanse more than 20 mm., forewing covered with small spots and short 

 transverse dashes of ferruginous scales holographa, new species 



Alar expanse less than 15 mm., forewing covered with scattered brick-red scales 

 and costa with eight small fuscous spots brachystigma, new species 



Nesochoris holographa, new species 

 Figures 72-73 



Alar expanse 22 mm. 



Labial palpus pale clay color outwardly mixed with ferruginous; 

 third segment fuscous tipped. Antenna clay color; scape ferruginous 

 dorsally; remainder of segments ferruginous apically; antennal cilia- 



