p.\:\ipiin,n)i: u^rociiORES taumas. 



1727 



upper organ not greatly longer than the clasps, the hooks nearly four times as long as 

 broad, a little excised on the basal half, afterward taperini; on the next qnarter only, be- 

 yond which the tips are slender, nearly attingent and horizontal , and rather bluntly termi- 

 nated ; lateral arras free, as far as the hooks are from each other, as long as they, 

 aculiforni. Clasps rather more than twice as long as broad, more nearly sabre-shaped 

 tlian in the other species, the upper margin being convex beyond the basal excision, the 

 upper angle terminating in a short, aculiforni spine, not curved inward, and nearly con- 

 cealed by the upper posterior lobe which is directed backward, nearly horizontal, tri- 

 angular and more than twice as long as the spine. 



Described from 62 3 , 25 9 • 



Specimens from Cape Breton and Nova Scotia, as shown by Mr. Thaxter's collections 

 and others sent by Jlr. J. JI. Jones, of Halifax, as well as those found at Nepigon and 

 other boreal parts of Canada, are remarkal)le for their smaller size, and the almost total 

 absence of dull fulvous dusting upon the nnder surface of the hind wings, the upper 

 and under surface being almost precisely alike in general tint. 



Accessory sexual peculiarities. The discal stigma of the male has been described 

 under the wings ; the scales contained in it consist of the usual jointed, thread-like hairs 

 in the heart of the stigma, the joints relatively short (49 : 4 f ) ; besides these are other 

 scales of a peculiar character (4 b, e), consisting of a stem tapering at either extremity 

 and having a broad, spatulate apex, sometimes connected with the stem by an exces- 

 sively slender thread, sometimes with a scarcely perceptible strangulation (these are 

 wrongly marked on the explanation of the plate as found in the field below the stigma j 

 they occur there only by accident) ; just above the middle of the stigma are found ex- 

 ceedingly slender cover scales of various forms (4 c, g, h, i), and at the extreme base 

 of the stigma the usual two-pronged rods (4 a), here rather slender. 



Egg (66 : 29). Cells of an irregular, angular shape, .03 mm. in diameter; their surface 

 covered with excessively minute, shallow, and ratlier broad punctuations ; inner cells of 

 micropyle six or eight in number, .OlOG by .017 in size, five of which seem to be tipped 

 by canals, surrounded by nearly uniform, somewhat angular oval cells, only a little 

 larger than the central ones and scarcely increasing in size outwardly, the largest being 

 but .0127 by .021 mm. in size. Color pale green. Height, .0 mm. ; widtli, .84 mm. ; 

 width of flattened portion of summit, .34 mm. ; diameter of micropyle, .153 mm. 



CaterpUlar. First stage. Head black, shining, smooth or minutely wrinkled with 

 distant shallow punctures, .01 mm. in diameter, each giving rise to a delicate white 

 hair .06 mm. long; antennae black, the last joint small and short, fuscous, giving rise 

 to a pair of colorless short hairs ; mouth parts black. Body White, transversely wrinkled ; 

 there is a faint dorsal line ; a subdorsal row of straight fuscous bristles (86 : 53), clubbed 

 and pellucid at tip, placed on themiddlc of the anterior half of each segment from the 

 second thoracic to the penultimate abdominal, and directed upward and inward, .05 mm. 

 long ; also a lateral row of similar appendages, not inclined, on the posterior half of the 

 same segments; just above and beneath the stigmata there is a similar row on the anterior 

 half of the segments, and the infrastigmatal series with another on the posterior half 

 of the segments ; first thoracic segment with a black dorsal shield bearing a transverse 

 row of six long, straight, spinous hairs, not tapering, the tip white, at least .09 mm. 

 long; stigmata dark fuscous; the last segment bears in the middle of either side a long 

 recurved hair and a pair of similar ones on the hinder edge, closely approximate ; besides 

 there are on either side at the edse three long ones slightly recurved; second and third 

 thoracic segments each with a lateral, double, rounded, pale, corneous spot on either 

 side .015 mm. in width; first pair of legs black, others pellucid, last joint and claw in- 



