ME60THEX, ClIltOSTOSOMA. 215 



hyaline, the veina 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. 



Hah. Brazil, Santa Catharina. Exp. 30 millira. Type t in 

 Coll. Schaus. 



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

 Pseudomya desperata, Wlk. vii. 1()02 (1850) ; 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, Ohiriqui ; Brazil, Amazon (Bates), 1 2 type t in 

 Mus. Oxon., Casa Branca, 2 $ . Eay. 22 millim. 



Genus CHROSTOSOMA. „, 



lype. 



Chrostosoma, Hiibn. Verz. p. 120 (1827) echemus. 



Lamocharis, Herr.-Scliaffer, Aussereur. Schmett. i. p. 80 (1854). echemus. 

 Heterodontia, Feld. Reis. Nor. p. 5 (1874) tricolor. 



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

 proboscis well developed; anteunie bipectinate, the branches dilated at 

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

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

 Hind wing with veins 2 and 4 stalked ; 3 absent, ur 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. 



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



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



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, un.ra. 



450. Chrostosonia decisa. 



Pseudomya decisa, Wlk. xxxi. p. 81 (1864) ; Kirby, Cat. Het. p. 137. 



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



ihorax with metallic blue patches ; crimson spots at base of 



patagia ; abdomen with 



crimson dorsal basal spot 



and lateral series of metallie 



blue spots ; underside of 



thorax and abdomen white. 



Fore wing hyaline, the 



veins and margins black. 

 Fig. \d'2.-Chrostosoma decisa, J. i. ^^^ ^^j^^^j ^^^^^ j,^,^^^ ^^,^^^ 



