Pomona Cnllego, Claremont. California 15 



Many indi\iduals were found in copulo on April 12, 1913, and 

 on April 14, 1915. Eggs were laid in great numbers April IS, 

 1913, but not until the first of May in 1915, due to a long stretch of 

 cold wet weather. By May 18 many eggs were to be found but 

 usualK no hir\ae. The eggs are laii,! in masses (PI. I, V\g. 3) of 

 from two to fifteen in a cluster with an average of between seven 

 and nine. They are deposited usually on the lower surface of the 

 leaf. Xo eggs are deposited until the foliage is well along usually, 

 as this is the food of the lar\ae. The writer obser\ed a female 

 during oviposition. She thrusts out the egg and by a mucilagenous 

 substance causes the egg to adhere fast to the leaf. She decorates 

 the egg, as it were, with a Huid which later turns black and appears 

 as a streak across the o\a. The adults do not li\e long after egg 

 deposition, usually about a week and a half. A number of females 

 were obser\ed to lay from forty to fifty eggs each. 



The length of the egg stage was found to vary considerably e\en 

 in the insectary, due no doubt largely to the weather conditions. 

 In indoor obser\ations it ranged from seven to fifteen days, with 

 an average of twehe. In the open, eggs under screen cloth were 

 deposited on May 24, 1913, and hatched June 10, 1913, a duration 

 of seventeen days. By June, 1913, practically all of the egg masses 

 had hatched and scarcely an adult could be found anywhere. The 

 larvae are at first yellow, changing o\-er to a black after a short 

 period of time (PI. I, Fig. 7). The eggs split at the side when 

 the young emerge and the !ar\ae remain quiet for some time appar- 

 ently feeding first on the remaining egg juices. After a while they 

 begin to mo\e about for convenient feeding spots. The Iar\'ae 

 moult three times, and after each moulting appear yellow, soon 

 changing to a black. Se\ eral of the grubs usually work on the same 

 leaf, continuing to eat small irregular holes, through, or nearly 

 through, the leaf until it appears skeletonized (PI. I, Fig. 7), when 

 they seek new pastures. 



When full gro\\n the lar\ae drop to the soil aiul after burrowing 

 to a depth of about an inch or less, they construct soil cells of earth 

 (PI. I, Fig. 6), not unlike the cell of the common cherry and pear 

 slug, in which they pupate. By July 3, 1913, many larvae were 



