LEPIDOPTEKA HETEROCERA. 627 



This species is much more nearly allied than N. California to 

 the typical N. Plantaginis. 



a, b. Rocky Mountains. Presented by the late Earl of Derby. 



Genus 11. PHAOS. 



Mas. Corpus sat gracile. Proboscis brevis. Palpi breves, 

 pilosi ; articulus 3us minimus. Antennae pectinatae, ramis sub- 

 clavatis, mediocriter longis. Abdomen lineare, alas posticas non 

 superans. Alae antieae angustae, triangulares. Pedes mediocriter 

 validi ; tibiae anticae apud medium calcaratae, posticae quadrical- 

 caratae. 



This genus seems to connect Nemeophila with the LithosiidcB. 



Male. Body rather slender. Head and thorax clothed with 

 short hairs. Proboscis short. Palpi short, hairy ; third joint very 

 small. Antennas more closely pectinated than in Nemeophila ; 

 branches subclavate, of moderate length. Abdomen linear, ex- 

 tending nearly as far as the hind wings, with short hairs ; sides with 

 small tufts of hairs. Fore wings narrow, triangular, straight along 

 the costa ; outer border slightly oblique and convex ; hind angle ob- 

 tuse and rounded ; first, second and third inferior veins very near 

 together at the base ; fourth full four times further from tbe third 

 than the third from the first. Hind wings much broader than the 

 fore wings, and about two-thirds of their length. Legs moderately 

 stout ; fore tibiae armed with a long spur in the middle beneath, and 

 with a short spur at the tip above ; hind tibiae with four spurs 

 of moderate length. 



1. Phaos interfixa. 



Nigra ; thorax cano trivittatus ; abdomen rufum, vitta dorsali 

 maculari nigra, subtus flavum, e maculis nigris trivittatum ; 

 femora supra rufa; alee anticce maculis plurimis testaceis, 

 vittaque basalirufa; posticce lutece, vitta lata marginali nigra 

 luteo guttata. 



Black. Head clothed with hoary hairs, and on each side 

 between the eyes and on the vertex with black hairs. Thorax with 

 a band in front and with three stripes of hoary hairs. Abdomen 

 red, with a dorsal row of black spots ; under side pale yellow, with 

 three rows of black spots. Fore wings full of pale testaceous spots, 

 some of them more or less tinged with luteous, and at the base with 

 a short costal red stripe ; the spots are smaller and more numerous 



