228 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



H. manfeo var. — ("On bircli, Virginia, September 14, 1S82,"" Department of Agriculture.) 

 Two blown si^eciuiens, full-grown larva\ (PI. XXIX, figs. .5, .5ff.) Leugtb,30 mm. Tlie bead is 

 moderate in size, sbaped as in tbatof normal maiiteo, with a lateral, narrow, brown line, bordered 

 externally with white. The head is rather freer from bristles, and is i)alcr than in normal mantco; 

 in fact the whole body is paler, like the underside of a birch le;if, compared with the other blown 

 specimens. In one of the examples thei'e is a flue, narrow, reddish V-shaped mark, the arms of 

 the V being situated outside of the elypeus. 



On the piothoracic segment are two flattened, yellowisli, piliferous warts, connected by a 

 slight low ridge. There are four dorsal smaller conical i)iliferous warts on the second and third 

 thoracic segments. (These are just as in //. maufeo.) On the first abdominal segment are two 

 cylindrical, conical, coral-red dorsal tubercles, arising from smaller bases, and are (in one example) 

 deep blood-red, forming an oval spot, situated mostly , jii the outside of the tubercles. These tuber- 

 cles are of the size of those in Stage IV of normal manteo, and the conical nipples are themselves 

 larger than in some of thefonrth stage of normal manieo, birt of the same size as in the others ; in fact, 

 these tubercles vary much in size in different individuals of normal manteo of Stage IV, which shows 

 that they are comparatively suddenly produced or are a lately acquired character, and are thus 

 inconstant. The third abdominal segment is much as iu normal manteo, Stage IV, but in one of the 

 si)ecimens is a large, deep blood-red, irregular, oval, subdorsal spot of the length of the segment 

 itself, and in the subdorsal line on the sixth abdominal segment is a much smaller blood reel spot. 

 The eighth segment is dorsally decidedly gibbous, and bears two distinct, but small, yellow, 

 piliferous, flattened dorsal warts. The dorsal yellowish and the two subdorsal yellowish white Hues 

 are of the same width aud arrangement as iu normal /Hfii^o, but the red inner border is neai'ly 

 obsolete. 



What at once strikes the eye are the three pairs of une(pial, deep blood-red, subdorsal spots, 

 which are partly inclosed by the subdorsal lines. On the sides of the body are thickly scattered 

 red spots, running sometimes into very short curved lines. 



There is a spiracular yellow line extending from next to the head to the second abdominal 

 segment, beyond which it is obsolete. The abdominal feet are tipped with reddish; the anal legs 

 with two parallel reddish stripes beneath, while the lateral piliferous warts are yellow. 



It varies much in tlie three pairs of subdorsal, abdominal, dark blood-red spots, as they are 

 (entirely wanting iu one of the specimens. It is plainly derived lidm normal manteo, and is adajited 

 for existence on the pale yellowish green underside of the birch leaf, while the deep blood-red si)ots 

 ;are similar in color to those of the birch twigs or leafstalks. 



A larva near L. manteo, if not of that species. — Three blown specimens, "Xo. 330, on linden, 

 'October 17, 1874," were loaned nie by Professor Riley. (PI. XXIX, figs. 4, 4a.) 



I can not see any diflerence between these specimens and If. mantco. Length, 34 mm. The 

 head is deep amber, with a broad, black, lateral baud bordered externally with a rather narrow 

 whitish baud. The dorsal tubercles are as in H. manteo of the last stage. Those on the first 

 , abdominal segment are small, low, flattened and red around the base. The eighth segment is 

 gibbous, with the piliferous warts small, normal, and yellow. The yellow dorsal line is distinct, 

 and the subdorsal lines are, as in H. manteo, broad and white, tinged with yellowish- on the upper 

 edge, aud broadly but very irregularly bordered with reddish inside, this edging broken up iuto 

 red scattered spots. The spiracular Hue is yellow, situated just below the spiracles, which, as 

 , usual in this genus, are partly merged in the upper edge of the line. 



Cocoon. — In confinement spinning " a very slight, elastic, silken cocoon," some "a tough silken 

 cocoon, others one made only of a few threads, while some had no cocoon at all, but had made a 

 smooth cavity in the earth" (Riley). According to Comstock's infornmnt, in nature the mature 

 caterpillar entered the ground, where they laid most of the winter before trausformiug. 



Pi(im. — S (bead wanting). Length, 18 mm. End of body less blunt than in Schizura. 



Last f(mr segments smooth, polished; crenmster ending in two stout foot-like spines, the toe very 



long and pointed, the heel pronounced; the surface transversely densely corrugated; vestiges of 



anal legs swollen and quite distiuct; two S sexual openings, the hinder one being the smaller of 



.the two. (Drawn up from Riley's Xo. 249.) 



