no. i. BOMBYCINE MOTHS OF NORTH AMERICA— PACKARD. 193 



c? dictynna. Sir George Hampson thinks it is a good species; as the larva differs from luna 

 (Schaus), it may be regarded as a distinct species. 1 



A new climatic race (?) hred in Europe. — Tropaea luna, var. bollii (Wagner); Saturnia 

 bolli Wagner, Tijdschr. voor Entom., 1875-76, XIX, p. xcvii-xcviii; Isis, etc. 



The <$ specimen in the Cambridge Museum reared in Switzerland differs from the Texan 

 normal luna S in the antennae being very narrow, but little more than half as wide as usual; 

 the submarginal brownish line on the fore wings is distinct; ocellus small, its outer edge indis- 

 tinct; that of hind whig is much smaller than in natives of Texas, about one-fourth less in 

 diameter, and the pink line is wanting in the ocelli of the hinder wings. The tail is rather 

 short, and the moth is a little smaller than other Texan luna. The edge of both wings is yellowish 

 as in the summer form of T . luna. 



[Other varieties of T. luna have been described as follows: 



(1) Variety rossi (Ross). Male pure white, expanding 3§ inches; female white with a 

 light yellowish tinge. Near Toronto, Canada. (Classif. Cat. Lep. Canada, 1872.) 



(2) Variety rubromarginata W. T. Davis. A spring form hi New York State, having the 

 costa red or reddish, and the outer margin of the wings "of a reddish or scarlet hue." (Psyche, 

 June, 1912, p. 91. )] 2 



Life history of Tropica luna (Linne). 



The eggs were received from Mr. James Angus. 



Egg. — Oval-cylindrical, somewhat flattened. The shell is thick and tough, dark brown 

 externally, but in places the brown is worn off, leaving a dull, sordid chalky whitish surface; the 

 inside of the shell slightly bluish gray. The surface of the shell is seen under a Tolles triplet 

 to be rough and finely granulated, and under a half- inch objective, the surface is seen to be 

 closely granulated, the pits between the granulations being often confluent; rarely the raised 

 bosses appear to be polygonal. Length 2.1 mm., breadth 1.8 mm. Eggs laid at Providence, 

 June 14; hatched June 22-25. 



Larva. — Stage I. Length 6-8 mm. Some were observed hatching out between 11 and 1 

 o'clock p. m., June 15. Before entirely breaking out of the eggshell the tubercles on the anterior 

 segments become erect, and the hairs radiate from them, but behind along the third thoracic 

 and abdominal segments the tubercles were seen to be soft and flattened or appressed to the 

 body and adhering in flaccid bundles. In S. cecropia, on the other hand, all the tubercles and 

 bristles are flabby for perhaps hah an hour after the creature frees itself from the egg. 



One was seen to emerge at 1.15 p. m., and by 1.25 p. m. all the tubercles had become filled 

 out and erect, with stiff, radiating bristles. 3 On hatching, the body is entirely green, except 

 the bands on the head. Some larva? on hatching are (a) entirely yellowish green, while the 

 dorsal hairs are darkish, and the head is twice banded. Others (b) have a very broad blackish 

 lateral band, inclosing one lateral row of greenish tubercles, the band ending on the eighth 

 abdominal segment, and nearly meeting above. The prothoracic segment is dark on the hinder 

 edge, and the second and third thoracic and first abdominal segments are entirely dark above. 



The following description is drawn up from individuals which had been hatched for about a 

 week (May 24-26), and were near the end of this stage. The body was larger, fuller, and 

 less tapering posteriorly than at first. The head is small, about half as wide as the body, 

 rounded, and at rest can be retracted within the prothoracic segment. There is a transverse dark 



i [The U. S. National Museum has eight specimens of T . truncatipennis; the localities are Jalapa, Guadalajara, and Orizaba. They all have the 

 outer margins of the wings narrowly red. The costo-apical angle of the secondaries seems normally much more acute than in luna, and from here 

 to the base of the tail the margin is straight, whereas it is distinctly convex and wavy in luna. None shows any traces of dictynna bands. The 

 sexes seem not to differ in color.] 



2 [Dr. W. T. M. Forbes suggests that the account of rossi could apply to newly emerged examples of typical luna, with the descriptions of the 

 sexes reversed. Excellent specimens of rubromarginata are in the National Museum, and also a more extreme ab. rubrosuffusa, of which a male was 

 taken at Washington, D. C. (Knab). This is like rubromarginata, but has the red of outer wing margins, especially of the hind wings, broader and 

 suffused, on hind wings at base of tails fully 5 mm. broad, and this is bordered within by a pallid, almost bluish suffusion. The ocelli on the hind 

 wings are unusually large.] 



8 It is evident that before and at the point of hatching the setse or bristles are filled with blood, which distends them. While thus distended, 

 the fluid may ooze out of the ends, and thus they may be called glandular hairs. In those which are full and bulbous at the end, the fluid may 

 be retained through stage I, and in rare cases through the second or even the third stage. 



83570°— 14 13 



