MESOTHEX. CHROSTOSOMA. 



215 



hyaline, the veins and margins black. Eore wing with the base 

 black ; the terminal band expanding at tornus and widely on apical 

 area. Hind wing with the terminal band expanding at apex. 



Eab. Brxzil, Santa Catharina. E,vp. 30 millim. Type t in 

 Coll. Schaiis. 



449. Mesothen desperata. (Plate VIII. fig. 3.) 



Fseudomija desperata, Wlk. vii. 1602 (1856) ; Kirby, Cat. Het. p. 139. 



$ . Black ; abdomen with rather broad greyish subdorsal fasciae ; 

 wings hyaline, the veins and margins black. Fore wing with the 

 costal and inner fasciae broad at base, the terminal band expanding 

 slightly towards apex. 



Hah. Panama, Chiriqui ; Brazil, Amazon (Bates), 1 $ type f in 

 Mus. Oxon., Casa Branca, 2 $ . E.t2^. 22 millim. 



Type. 



Genus CHROSTOSOMA. 



Chrostoso>7ia, Hiibn. Verz. p. 126 (1827) 



LcemGcharis, Herr.-Schaffer, Aussereur. Scbmett. i. p. 80 (1854). echemus. 

 Heterodontia, Feld. Reis. Nov. p. 5 (1874) tricolor. 



Palpi upturned, not reaching vertex of head, the 3rd joint acuminate ; 

 proboscis well developed ; antennae bipectinate, the branches dilated at 

 extremity ; tibijB with the spurs minute. Fore wing with vein 3 from near 

 angle of cell; 4, 5 from angle; 6 from upper angle; 7, 8,9, 10, 11 stalked. 

 Hind wing with veins 2 and 4 stalked ; 3 absent, or stalked with 2; 5 from 

 middle of discocellulars ; 6, 7 from upper angle. 



Sect. I. Hind wing with vein 3 absent. 



A. Hind wing with the basal area white. 



a. Vertex of head metallic blue; hind wing with the dark 

 terminal band emitting a projection below the cell to 

 near the base decisa. 



h. Vertex of head dark ; hind wing with the projection of 



terminal band not reaching beyond middle of wing... hcematica. 



B. Hind wing with the basal area hyaline, 



a. Abdomen with crimson dorsal spot on 1st segment ... echemus. 

 h. Abdomen with crimson subdorsal spots on 1st segment, im.vd. 



450. Chrostosoma decisa. 



Pseudomya decisa, Wlk. xxxi. p. 81 (1864) ; Kii'by, Cat. Het. p. 137. 



Black with a slight purple tinge ; vertex of head and meta- 



thorax with metallic blue patches ; crimson spots at base of 



patagia ; abdomen with 



crimson dorsal basal spot 



and lateral series of metallic 



blue spots ; underside of 



thorax and abdomen white. 



Eore wing liyaline, the 



veins and margins black, 

 Fig. \02.-Chrostosoma decisa, ^. i. ^^^ ^^.^^^ ^,^^ -^^^^^ ^^^^^ 



