258 F. Arthropoda. 



where it emits the recurrent nervule ; middle discocellular nearly in a line with 

 upper segment of lower discocellular ; upper discocellular short , directed out- 

 wards ; upper radial twice as long as the distal segment of the subcostal ; sub- 

 costal strong ; proximal segment slightly longer than the three segments of the 

 median nervure ; costal and subcostal nervures divergent , but approximating to- 

 wards their distal ends. Tarsus of front leg of female five-jointed, second and 

 third joints strongly spurred. (Type Ithomia salvinia Bates.) 



In this section of the old genus Ithomia the secondaries of the male have the 

 full complement of nervules ; but the cell is differently shaped from that of Leuco- 

 thyris, being much shorter, and the upper discocellular so short that the upper ra- 

 dial lies close to the terminal segment of the subcostal. We are acquainted with 

 fifteen or sixteen species belonging to this form , which range over a wide area 

 from South-Brazil to Mexico. 



Hypoleria n. gen. Godman & Salvin, in: Biol. Centr.-Amer. Zool. Rhop. Vol. 1. 

 Nvmbr. 1879. p. 52. Lower discocellular of secondaries of male directed across 

 the wing and atrophied at its upper end , not meeting the middle discocellular ; 

 middle and upper discocellulars and upper radial strong, the latter not uniting 

 with the subcostal at its distal end ; lower radial very slender, a small recurrent 

 nervule attached to its proximal end. Costal and subcostal divergent in the 

 middle, where they enclose an elliptical space , which , however , is not closed at 

 its distal end (Section a.); or costal and subcostal lying close together throughout 

 their length (Section b.). 



Secondaries of the female in Section a. with the middle discocellular very short, 

 upper discocellular absent , the upper radial being a branch of the subcostal ; fe- 

 male of Section b. unknown. 



(Types: Section a. H. libera nob. ; Section b. Ithomia polissena Hew.) 



This genus has many of the characters of Hymenitis, but differs in not having one 

 of the peculiarities of that genus, in which the upper radial and subcostal of the 

 secondaries in the male unite at their extremities instead of running free to the 

 margin as in the present genus. Five species of the group appear to belong to 

 Central- America ; but the limits of the genus in South-America we have not yet 

 been able to ascertain. Of these five species, H. libera and H. cassotis are cer- 

 tainly congeneric ; the position of H. fumosa must remain doubtful until male ex- 

 amples have been examined , so also must that of H. rhene, of which we have no 

 specimen at hand for reexaminatiou ; the fifth , H. polissena , is aberrant , in as 

 much as the costal and subcostal nervures of the secondaries of the male lie close 

 together, instead of diverging to enclose an elliptical space as in H. liberal 



Pseudoscada n.geu. Go dman & S alvin, in: Biol. Centr.-Amer. Zool. Rhop. Vol. 1. 

 Nvmbr. 1879. p. 55. Lower discocellular of secondaries of male placed at right 

 angles to the third segment of the median nervure , slightly curved and atro- 

 phied at its upper end , lower radial very slender ; middle and upper discocellu- 

 lar, upper radial . and subcostal very strong ; costal nervure atrophied , scarcely 

 perceptible as a spur on the subcostal at about one third of its length from the 

 base; ends of upper radial and subcostal free, not uniting as in Hymen! tis. Three 

 discocellular nervules present in the female ; both upper and lower radials with 

 separate origin. Tarsus of front leg of female with five joints, a pair of spurs on 

 each of the first, second, and third joints. (Type Ithomia pusio Godm. & Salv.) 



oThough at first sight very similar in structure to Hymenitis. this genus presents 

 so many differences that its separation seems necessary. The atrophy of the costal 

 nervure in the secondaries of the male is not found in any other group , so far as 

 we know ; and the subcostal and upper radial having free ends is another diver- 



