28 



PAPEES ON INSECTS AFFECTING VEGETABLES. 



The following synonymy is recognized : 



Hell ula undalis Fab., Ent Syst, vol. 3, 2, p. 226; Herrich-Schaffer, Eur. 



Schmett., vol. 4. pi. 8, f. 54. 

 Scoparia alconalis Walker, Catalogue, vol. 19, p. S27. 

 Leucmodes exemptalis Walker, Catalogue, vol. 34, p. 1313. 

 Botys rogatalis Hulst, Trans. Airier. Ent. Soc, vol. 13, p. 149. 



The wing venation, head, and antenna arc shown in figure 5. 



THE EGG AND OVIPOSITION. 



A pair of moths newly reared was placed in a vial July 24, and 

 next morning the female was found to have deposited singly, doubly, 



and in masses of from 3 or 

 4 to 20, a total of 235 eggs. 

 The following day 24 were 

 laid: on the 27th, 37 were 

 found, or 200 in all. After- 

 wards the moth died, hav- 

 ing laid no more. A few 

 eggs were found upon dis- 

 section, making the prob- 

 able number usually depos- 

 ited between 300 and 350. 



Most of the moths die in 

 confinement within a week. 



The egg. — The egg is of suffi- 

 ciently large size, about four 

 one-huudredths of an inch in 

 length, as to be readily discern- 

 ible to the naked eye. It is of 

 oval form and rather variable in contour, being usually more or less flattened 

 upon the surface of deposit, and there is often a distinct nipple at one extremity. 

 Its greatest width is about three-fifths its length. The color when first laid 

 is light gray, and under a strong hand lens the surface 

 appears to be rugose and strongly iridescent. Under a 

 higher power the surface is found to be made up of 

 depressed irregular areas, mostly hexagonal and penta- 

 gonal in outline. 



Length, about 0.5 mm. ; greatest width, 0.3 to 0.35 mm. 



Fig. 4. — The imported cabbage webworm (Hclhtla 

 undalis) : a. Moth; Z>, larva. lateral view; c, 

 larva, dorsal view ; (/, pupa All three times 

 natural size. (From Chittenden.) 



Fig. 5. — The imported 

 cabbage webworm : 

 Wing venation, head, 

 and antenna. All en- 

 larged. (After Hamp- 

 son.) 



A day after deposition the eggs begin to take 

 on a pinkish hue, due to light reddish spots 

 below the surface. On the second day the 

 embryo can be detected, the head showing as a 

 blackish dot near one end and on the lower surface of the egg or the 

 side of attachment. 



Experiments conducted in the latter days of July, in a temperature 

 officially rated by the Weather Bureau of this department as mod- 



