LEPIDOPTERA HETEROCERA. 645 



dots near the interior angle ; more than one-third part from the tips 

 is obliquely white with a blue tinge, and contains three black dots 

 in a line parallel to the exterior border; the veins and cilia in this 

 part and the whole of the costa are white ; under side blue-white, 

 with a few black marks, reddish tawny towards the base. Hind 

 wings reddish tawny, with white borders and veins, 



a. Kio Janeiro. From Mr. Stevens' collection. 



2. Empusa P Tybris. 



Pallide testacea ; caput album ; thorax canus, luteo maculatus, 

 antice albus ; abdomen luteum ; alee antics basi luteo guttatce, 

 triente basali albo-fusco plagiata, fasciis duabus obliquis 

 e guttis fuscis ; posticce costa alba, margine interno luteo. 



Phalaena Tybris, Cram. Pap. Exot. i. 145, pi. 92, f. D. 

 Empusa Tybris, Hubn. Verz. Schmett. (Phalcence Verce Hipocritce 

 Sphingiformes) 170, 1751. 



Surinam. 



3. Empusa? Scyton. 



Albida ; abdomen atrum glauco fas datum, caput luteum; thorax 

 cinereo oblique bifasciatus ; apice luteum ; alee anticce macula 

 costali apicibus, fasciisque duabus obliquis cinereis, fascia 

 la abbreviata ; posticce cinerece, antice albidce semihyalince, 



Zygaena Scyton, Fabr. Sp. Ins. ii. 164, 40; Mant. Ins. ii. 106, 49 ; 



Ent. Syst.m. 1,401,52. 

 Sphinx Scyton, Cram. Pap. Exot. ii. 5. pi. 99, f. B. 

 Sphinx Zygaena Scyton, Gmel. ed. Syst. Nat. i. 5, 2398, 144. 

 Empusa Scyton, Hubn. Verz. Schmett. (Phalance Vera Hipocritaz 



Sphingiformes) 170, 1752. 



Surinam. 



Genus 23. IDALUS. 



Corpus breviusculum. Oculi magni. Proboscis corporis di- 

 midio brevior. Palpi mediocriter longi ; articulus 2us lo multo 

 longior ; 3us minimus. Pedes sat graciles, non longi ; tibiae pos- 

 ticae calcaribus quatuor parvis. Mas. — Antennae breviter pectinatae. 

 Abdomen alas posticas paullo superans. Sexualia parva, occulta. 

 Alae posticae bievissimae, antice dilatatae, apice tnmcatae. Fcem. — 

 Antennae simplices. Abdomen alas posticas sat longe superans. 

 Alae posticas breviusculae. 



Phalaena, p., Cram. 

 Empusa, p., Hubn. 



3l2 



