LEPIDOPTERA HETEROCERA. 1427 



Genus J 2. TITYA. 



Fcem. Corpus valde robustum, dense pilosum. Proboscis ob- 

 soleta. Palpi porrecti, brevissimi, sat graciles. Antennae subpec- 

 tinatae, thorace multo breviores. Abdomen alas posticas paullo 

 superans, Pedes validi, pilosi calcaribus duobus minutis apicalibus. 

 Ala3 mediocriter latae ; anticae apud costarn subrectae, apice rotun- 

 datae, margine exteriore mediocriter obliquo. 



Female. Body thickly pilose, very stout. Proboscis obsolete. 

 Palpi porrect, rather slender, very short, not extending so far as the 

 head. Antennae very minutely pectinated, much shorter than the 

 thorax. Abdomen extending for one-fourth of its length beyond the 

 hind wings. Legs stout, pilose ; hind tibiae with two minute apical 

 spurs. Wings moderately broad. Fore wings straight along the 

 costa till near the tips, where they are very slightly convex, abruptly 

 rounded at the tips, oblique along the exterior border, the latter 

 forming a curve and no angle with the interior border ; second in- 

 ferior vein much nearer to the first than to the third ; third much 

 nearer to the second than to the fourth, which springs from near the 

 base of the wing. 



1, Tttya noctilux. 



Fcem. Nigro-cinerea ; alee anticce supra argenteo-albm, margini- 

 bus angustis, fascia obliqua venisque exterioribus nigra- 

 cinereis. 

 Female. Blackish gray. Fore wings above clear silvery white, 

 with narrow blackish gray borders, and with a blackish gray band, 

 yvhich extends from near the tip of the costa to the middle of the 

 nterior border ; veins beyond the band blackish gray. Length of 

 ,he body 12 lines ; of the wings 30 lines, 

 itio Janeiro. In Mr. Fry's collection. 



Genus 13. LASIOCAMPA. 



Corpus robustum aut crassum. Palpi breves, crassi, pilosi, 

 paput non superantes ; articulus 3us parvus. Antennae thorace 

 iongiores. Abdomen alas posticas non aut paullo superans. Pedes 

 ralidi, pilosi ; tibiae posticas calcaribus duobus apicalibus minimis. 

 Ike latae; anticae apud costam rectag aut vix convexae, apice sub- 

 otundatae, margine exteriore parum obliquo. Mas.— Antennae 



PART VI. 



3L 



