Scudder.] 292 [April 27, 



blade, about as long as its terminal portion, ending in a thickened, 

 bluntly rounded tip. 

 Northern States. 



GROUP IV. 



Upper organ: crest elevated as a gibbous protuberance, sur- 

 mounted by prickles; terminal hooks separate, stout; tooth stout, 

 conical on a side view. Clasp : basal process of left blade larger at 

 the tip than at the base, scarcely longer than broad, directed upward; 

 right lobe three times as broad as long. 

 Nisoniades Terentius nov. sp. Fig. 6 . 



Upijer organ : Main body small, not very slender, short, not high. 

 Crest protruding upward and a little backward into a plump, bulbous 

 ridge, armed with minute points, and, when viewed from above, with 

 a broad furrow a little upon one side of the middle ; this may be due 

 to shrinkage. Hooks very short, very stout, curved, bluntly pointed, 

 widely separate at base, divaricate almost at right angles; from the 

 middle of the ridge uniting their bases depends a short, rather small 

 denticle, bluntly conical on a side view, very broadly obcordate on a 

 hind view. Base of the lateral arms greatly produced in a pos- 

 terior direction; otherwise directed downward, then bent at more 

 than a right angle backward, the lower edge very soon expanding 

 quite broadly, so as to meet the similar portion of the opposite one 

 beneath, and bearing upon this united belt the inferior armature, 

 which occupies with its minute raised points a very large and broad 

 field, reaching nearly to the base of the terminal hooks. 



Left clasp : Main body pretty broad, base obliquely and very 

 largely docked above, upper margin deeply, broadly and roundly ex- 

 cised just before the lobe; transversely it is a little gibbous, and 

 longitudinally a very little curved. Blade very long, compressed, its 

 upper edge a little incurved, giving it a solid appearance, gradually 

 twisted so as to bring the outer surface uppermost; it diminishes in 

 size very gradually to the tip, curving very slightly inward in contin- 

 uation of the curve of the main body ; viewed laterally it is slightly 

 sinuous in its course, the apex bent inwards nearly at a right angle, 

 rapidly tapering, squarely docked and armed with very minute teeth 

 at the tip; basal process directed upward and somewhat backward, 

 bent also a little inward, especially by a twist of the hinder edge; it 

 is small, slightly longer than broad, broader at tip than at base, its 

 hinder edge straight and smooth, its front and upper edge rounded 



