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two more transformed. On account of the interest attaching to 

 the early stages of the Anthicus, no effort was made to rear the 

 adult from material gathered, but all pupas and larvae in differ 

 ent stages were preserved in alcohol. Without doubt the beetles 

 would have emerged before fall and the insect would have hiber 

 nated in the adult condition, as do its relatives. From these obser 

 vations we judge that there is more than one generation, depend 

 ing upon the amount of food and the length of time that these 

 egg-masses are available for food. The larva grows rapidly and 

 there must be other food than the Corydalis egg-masses for 

 early individuals. It seems likely that the beetle ordinarily 

 gnaws a hole in the egg-masses before laying its eggs, and it 

 seems, further, that few eggs are laid by each beetle in a single 

 egg-mass. Other beetles, however, visit the egg-mass subse 

 quently in many cases, as the fact that larvae of different sizes 

 were found would show. In lifting apparently unattacked egg- 

 masses for food for the larvae taken, we were surprised to find in 

 several cases that these masses contained young larvae of the 

 Anthicus, so that the beetle does not necessarily gnaw the char 

 acteristic large round hole in the egg-mass before ovipositing. 

 Careful observations were not made on this point, but it is likely 

 that the eggs in these cases were thrust under the edge of the 

 egg-masses where no orifice existed, or perhaps a small hole which 

 was unnoticed was made at such a point. The extent of the de 

 struction of the Corydalis eggs in this way was extraordinary. 

 An uninfested egg-mass could hardly be found among the hun 

 dreds which occurred upon the rocks along the stream and upon 

 the piers of the Aqueduct Bridge. 



There are three very interesting features connected with this 

 observation : First, that the eggs of Corydalis cornutus have 

 never before been known to be attacked by any insect ; second, that 

 this species of Anthicus is rare in collections ; and, third, that 

 very little is known about the early stages of any Anthicid. 

 Messrs. Hubbard and Schwarz say that they have seen the 

 leaves of trees overhanging the waters of the Grand river at 

 Grand Ledge, Mich., white with Corydalis egg-masses, but with 

 no signs of any insect attack upon them. The writer has seen 

 the leaves of trees overhanging several streams in the vicinity of 

 Ithaca, N. Y., similarly plastered with egg-masses, and, as 

 above stated, the Corydalis has for many years been studied by 

 Professor Comstock and his assistants, but Professor Comstock 

 has written me, in reply to an inquiry upon the subject, that he 

 has not noticed that the eggs are attacked by any insect at Ithaca. 

 The immunity in these two cases may be due to the fact that the 

 eggs are laid more commonly upon leaves and trees where the 

 larvae of Anthicus on emerging could not find a proper place to 



