88 ■ [September, 



wings, less than the apical fifth is occupied by a large opaque yellow space (not 

 very finely reticulated), bordered internally by a rather narrow smoky band, ex- 

 panding on the inner margin, and concave externally in an oblique manner : the 

 posterior wings have the extreme apex narrowly margined with blackish, which colour 

 extends a short distance along the principal sector ; otherwise these wings are alto- 

 gether hyaline. 



Length of abdomen to end of 6th segment, 47 mm. Expanse of wings, 102 mm. 

 Length of posterior wing, 50 mm. : greatest breadth of same, 10 mm. 



I have one ^ from the same locality as Jf. terminatum. Although 

 evidently allied to Microstigma, and of the ^^\n.e fades, thia genus at 

 present rests alone in the sub-family in having areticulated quadrilateral. 

 This area is long ; in both posterior wings there are two transverse 

 nervules in it ; in one anterior wing there are three, in the other two, 

 so that two is probably the normal number. The genus is also 

 peculiar, in having the wings petiolated almost up to the level of the 

 nodus. 



MECisToaASTER JocASTE, Hageu. 



Stett. ent. Zeit., 1869, p. 260. 



I have a ^ labelled as from Columbia, rather smaller than that 

 described by Hagen (expanse, 75 mm.). A $ from New Grenada 

 (expanse, 90 mm.) differs from the ^ in having the extreme apex of 

 the anterior wings smoky-brown. 



From East Peru (?) and Pebas, Upper Amazons, I have two ? 

 (expanse, 101 and 104 mm.) of what is perhaps only a race of this, 

 and which has long stood in my collection (and also in that of De Selys) 

 as M. sincerus, McLach., MS. It differs from typical Jocaste in all 

 the wings (especially the posterior) being tinged with smoky-brown, 

 insensibly shading into the dark portion before the apical spot in the 

 posterior wings ; in the anterior wings, the dark apical portion is much 

 broader than in ? Jocaste. 



I would remark that in .both forms the apical spot of the posterior 

 wings is pure white, rather than ^^ niveo-flavo" as described by Hagen. 



Mecistogasteb astictus (Burm.), De Selys. 

 I have two ^ and one ? from Minas Greraes. The ^ has not 

 yet been described. This sex is somewhat smaller (expanse, 80 — 85 

 mm.). It differs from the ? in having the wings altogether hyaline 

 (without white apical space). There ia no true pterostigma, but in its 

 place are several thickened black nervules, and in the posterior wings, 

 the costal vein is also thickened at this part, and rather suddenly 

 elevated, so as to form almost an angle. 



Lowisham, London : 



Auyust lOi/i, 1877. • 



