1456 CATALOGUE OF 



Geometra decussata, Wien. Verz. 107, 7. Bark. Eur. Schm, v. 274, 

 120. Hubn. Geom. pi. 41, f. 213. Frey. Beitr. pi. 107; 

 N. Beitr. iii. pi. 282, f. 3. ///. N. Ausg. dess. i. 427, 7. 



Idaea decussata, Treit. Schm, vi. 2, 160, 2. 



Schizostege decussata, Hubn. Verz. Schm. 336, 3241. 



Phalaena decussata, Fabr. Ent. Syst. iii. 2, 183, 195. 



SioDa decussata, Dup. Lep. v. 511, pi. 209; Sup. iv. 34, pi. 53. 

 Boisd. hid. 328, 1924. GWn. Phal. ii. 511, 1748. 



Chesias decussavia, Herr.-Sch. Eur. Schm. iii. 183, 226. 



a, Europe. From M. Becker's collection. 



2. StONA EXALBATA. 



Albida; al<z acutce, cervino dense conspersce, linea marginali 

 fuscescente ; anticce punclo discali tiigricante, linea exteriore 

 alba undulata. 



Geometra exalbata, Hubn. Geom. f. 474, 476. Frey. Beitr. iii. 



pi. 282, f. 1,2. 

 Geometra nubilaria, Hubn. Geom. f. 215. 

 Siona exalbata, Eversm. Bull. Soc. Imp. Nat. Mosc. 1837; Faun. 



Voly.-Ural. 436. Guen. Phal. ii. 512, 1749. 

 Chesias exalbaria, Herr.-Sch. Eur. Schm. iii. 183, 225. 



a. Europe. From M. Becker's collection. 



Genus 4. GYPSOCHROA. 



Corpus gracillimum. Frons lata, subquadrata, antice cornuta. 

 Proboscis longissima. Palpi graciles, compressi, peracuti, sub- 

 ascendentes. Abdomen lineare, longissimum, apice quadratum 

 subdilatatum. Pedes longissimi, gracillimi ; tibiae posticae calcari- 

 bus duobus brevissimis. Ala? angusta?, tenues, integrae, sericeae, 

 nitentes ; anticae elongatae ; posticae subquadrata?. 



Gypsochroa, Hubn. Verz. Schm. 336; Herr.-Sch.; Guen. Phal. ii. 



512. 

 Siona, p., Boisd. 



Body very slender. Front broad, subquadrate, with a horny 

 protuberance. Proboscis very long. Palpi slender, compressed, 

 slightly ascending, very acute at the tips. Abdomen linear, very 

 long, slightly wideued and quadrate at the tip. Oviduct prominent. 

 Legs very long, very slender; hind tibiae with one pair of very short 

 spurs. Wings narrow, delicate, entire, silky, shining, of one colour. 

 Fore wings elongated. Hind wings subquadrate. 



