LIFE lIISTOniES OF AMElilCAN MOTHS— DYAR. 259 



conIiiniiii|^ the referciu-c. Hc)wov«u", the hirva is an unequivocal 

 Syntoniid, showing the typical structure. The moths of the Syn- 

 tomida3 and Arctiidte are separated only by the absence of vein 8 of 

 the hind wings in the former. Hampson does not use this character 

 absolutely, for he includes P^ucereon in the Syntomidie, though some 

 of the species have a rudimentary^ vein S present, and he excludes 

 Halisidota, though some species have vein 8 nearly absent. The 

 lar^'al characters contirm both of these references, hut not so with 

 Eupseudosoma. In the latter genus the female has vein 8 entirely 

 a])sent; the male has a short vein, not reaching the costa. Even on 

 these characters Eupseudosoma might well be included in the Syn- 

 tomidfe; but when we consider that the subcostal vein in the male is 

 proba))ly secondary, merely a brace for the large costal lobe, it ren- 

 ders the reference more likel3^ 



The larA'a presents during ontogeny the usual gradual appearance 

 and disappearance of characters adapted to its habits at its dift'erent 

 stages. But there i,s one ver}" imusual feature, which is worthy of 

 special mention. The head is immaculate in all stages but one — the 

 penultimate. Then it assumes a large and peculiar marking. This 

 would iK)t ])e remarka])le if it appeared in the last stage, but to sud- 

 denly appear for one stage only and then completel}' disappear is 

 unique in my experience. It may be noted that the mark is normal 

 in the Syntomid.v, being present in all stages of Lyuiire edwardsi^ 

 showing in ( 'tn ucha virginica and indicated in Scepsis fulvicollisj but 

 the cause of its sudden appearance in one stage of Knpseadosoma 

 foj'lduin is far from <'lear. The general appearance of the rest of the 

 lar^■a does not change while the head is undergoing its transformation, 

 and the head is not conspicuous, being more or less concealed l)y the 

 hair. The mark was constant in all my 20 larvae. 



Egg. — Slightl}" more than hemispherical, base flat, apex very 

 slightly produced, suggesting the conoidal shape; clear 3"ellowish 

 green with amber lights al)out the edges, later opaque whitish green; 

 reticulations small, regular, rounded hexagonal, slightly raised, 

 smaller just around the micropyle, forming a ring of small cells 

 with one central one; micropyle eccentric, a little to one side of the 

 vertex oi the Qgg\ diameter, 1.1 mm.; height, 0.5 mm. Laid several 

 together or in a mass on the back of a leaf, not touching, often rather 

 remote and scattering. 



Stage I. — Head rounded squarish, slightl}^ bilobed, clypeus high, 

 the paraclvpeal pieces nearly reaching the vertex; free from pro- 

 thorax; antenniv moderate; primary sett\i short, black, distinct; i and 

 ii rather near the vertex, iii at the middle of the lobe, iv close to 

 ocelli, three behind the circle of ocelli (one inclosed), two below, 

 rather approximate above the antenna. Colorless, a yellow patch 

 showing fi'om within by transparency; jaws, ])rown: ocelli, black; 

 wndth. 0.1;-) mm. liodv arctiifoi-in with lai'^c tubei'cles and thick 



