MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



221 



scales. Eyes naked. Aiiteuu* well pectiuated ou the basal two-thirds, beyond flliform; the 

 branches more or less ciliated; the Joints above not densely scaled. Falpi mnch larger and rather 

 wider than usual, stout, ascending, reaching a little beyond the front; second joint longer than 

 the first and rather longer than usual; the scales on the upper side short and dense, below much 

 longer and uneven; third joint conical, often rather short, small, not always very distinct, being 

 more or less concealed by the long loose hairs of the second joint. 



Maxilhe longer than usual and very well developed, forming several coils. Thorax not 

 crested. Fore wings rather less than one-half as long as broad; costa nearly straight or slightly 

 convex ; apex somewhat rounded or pointed or (in Itydromeli) squarish, (in unicolor abruptly bent), 

 but usually somewhat i)roduced; outer edge long, oblique, convex (in unicolor sharply bent on 

 first cubital venule, III,;). Hind wings shorter and more rounded at the apex than in any other 

 genus of the family, outer edge shoi'ter, more regularly rounded than usual; costal and inner edge 

 of uearly the same length. Wings not tufted. 



Fig. 80. 



-Venation of Iletrrocnnipa iihliqua; the iiame.s of tbe veins as designated on p. &6; d, 

 anterior; (?', po.sterior discal vein; /, frenulum, sc, subcostal cell. 



Venation much as in Schizura, but quite variable; usually a long narrow subcostal cell, 

 though it is sometiines open in iudividnals of the same species; the third subcostal venule is very 

 short, and the cell between it and the fourth is minute; in the superha and hydrovieli group the 

 subcostal venules tend to be bent up at their end toward the costa, and so in ustartc and biundata, 

 but usually they are diverted more toward the apex, and then more parallel with the costa; the 

 discal venules vary in length and direction; the anterior one is usually short and diverted 

 obliquely inward to where it meets the sixth venule; the hinder discal venule either forms a 

 regular curvilinear line, or is broken into two portions forming an angle with the apex, pointing 

 inward, from which the median discal fold passes to the base of the wing ; the first cubital veiu 

 (III;,) usually more or less detached at its origin from the second and at the bend throwing off the 

 hinder discal venule ((/'). 



Hind wings with the venation quite uniform, the first and second subcostal venules separating 

 a short distance beyond the origin of the anterior discal venule, the first being a little shorter than 

 the second branch (in maiitco the second originates hallway between the first and the independeut) ; 



