28 



downward ; basal process not quite so long as in tlie iV. Horaiius, and 

 the whole npical half enlarged. Lobe projected further backward 

 than in N. Ilorn'iui, forminj a longer and more slender triangle. 



R!f/h' cla-p : Main body quite as in N. Ilom'iuit^ but a little broader, 

 Blade also siniilar, but broader throughout and at the tip nearly one 

 half as broad again as in the middle; basal process consisting of 3 

 small, elongate, subtriangular tooth, nearly uniform in width, bluntly 

 pointed, fully twice as long as broad at the base and as long as the 

 narrowest breadth of the blade, directed straight backward. Lobe 

 as in N. Horahnx, but a little larger and longer and scarcely so much 

 incurved. 



New England. 



GROUP VII, 



Upper orr/an : crest greatly elevated, expanded laterally into very 

 large, curving, prickly, asynniietrical flaps; hooks and tooth as in 

 irroup V. Clasps : much as in group VI. 

 HiEoniades tristis (Boisduval.) Fig. 15. 



Upjicr or.'jaii : JMa'n body long and rather slender, not high, some- 

 what arched ; posterior extremity of the upper surlace strongly ele- 

 vated and then expanded laterally into very unequal, outward and 

 downward curving alations, that of the left side forming an exces- 

 sively enlarged, broad, rounded lobe, the lower anterior portion 

 bent downward more than the otlier and produced anteriorly to a 

 considerable extent; the whole upper surface and edges and a por- 

 tion of the under surface are covered with minute raised points, which 

 become developed on the anterior edge into distinct spinules ; that of 

 the left side form a very long and slender, slightly sinuate, unarmed 

 plate, somewhat constricted toward the base, the tip well rounded, 

 not quite as long as that of the opposite side. Hooks moderately 

 stout, short, arching, pointed, scarcely divaricate, rather distant at 

 base, the right nearly abortive; tooth appressed, subcordate, with 

 compressed neck, projecting downward and very slightly backward, 

 the edges unarmed, emarginate. Amis slender, tapering slightly, di- 

 rected downward, with a slight anterior curve, bent backward abrupt- 

 ly at less than a right angle and then directed backward, upward 

 and inward, bearing between their tips the inferior armature, a rather 

 small, asymmetrical, rcniform field of raised points. 



Left clasp : Main body very broad, ujjpermost portion of the base quite 

 full, lower edge very slightly curved ; longitudinally nearly straight, lat- 

 erally but slightly gibbous. Blade long, directed almost horizon*-al!y 



