228 MEMOIRS OF TUE NATIONAL ACADEMY OF SCIENCES. 



11. muntto var. — ("On bircli, Virginia, September 14, 1882," Department of Agriculture.) 

 Two blown specimens, full-grown larvjt. (PI. XXIX, figs. 5, 5a.) Length, 30 mm. The lieadis 

 moderate in .size, shaped as in that of normal mntiteo, with a lateral, narrow, brown line, bordered 

 externally with white. The head is rather freer from bristles, and is ])aler than in normal manfio; 

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

 specimens. In one of the examples there is a fine, narrow, reddish V-shaped mark, the arms of 

 the V being situated outside of the elypeus. 



On the protlioracic segment are two tlattened, yellowish, piliferous warts, connected by a 

 slight low ridge. There are four dorsal suniller couical piliferous warts on the second and third 

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

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

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

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

 larger than in some of the fourth stage of normal manteo, bu ':. of the same size as in the others; in fact, 

 these tubercles vary nunh in size in different individuals of normal iiitinteo 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 in normal mnidco. Stage IV, but in one of the 

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

 itself, and iu the subdorsal line on the sixth abdominal segment is a much smaller blood-red spot. 

 The eighth segment is dorsally decidedly gibbous, and l)ears two distinct, but small, yellow, 

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

 are of the same width and arrangement as iu normal wifjwfco, but tho red inner border is nearly 

 obsolete. 



What at once strikes the eye are the three pairs of unetinal, 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 reddisli; the anal legs 

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



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

 entirely wanting in one of the specimens. It is plainly derived fiom nornnvl manteo, and is adapted 

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

 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, "No. 3."i(l, on linden, 

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



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

 head is dec]) amber, with a broad, black, lateral band bordered externally with a rather narrow 

 whitish band. The dorsal tubercles are as in Jl. 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 i)iliferous warts snuiU, normal, and yellow. The j'ellow dorsal line is distinct, 

 and the subdorsal lines are, as in H. manteo, broad and white, tinged with yellowish on the u])per 

 edge, and broadly but very irregularly bordered with reddish inside, this edging broken up into 

 red scattered s])ots. The spiracular line is yellow, situated just below the spiracles, which, as 

 usual in this genus, are partly merged in the upi)er edge of the line. 



Cocoon. — In confinement s])inniiig " a very slight, elastic, silki^i cocoon," sojue "a tough silken 

 cocoon, others one made only of a few threads, while .5onie had no cocoon at all, but had made a 

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

 catei-pillar entered the ground, where they laid most of the winter before transforming. 



I'npa. — i (head wanting). Length, IS mm. End of body less blunt than in Schizura. 

 Last four segments smooth, i)olished; cremaster ending in two st(mt foot-like spines, the toe very 

 long ami ]ioint(Hl, the heel ])ronoun(!ed; the surface transversely dcnisely cnrrngated; vestiges of 

 anal legs swolhMi and quite distinct; two $ sexual openings, the hinder one being the smaller of 

 the two. (Drawn up from Riley's No. 249.) 



