March, 1912.] MaTAUSCH : LiFE HiSTORY OF EnCHENOPA BINOTATA. 59 



water-color drawings of both adult and nymphal forms. It is now my 

 intention to make a careful study of the life histories of these insects, 

 as opportunity offers, more especially of the local forms/ As a con- 

 tribution towards this subject I present in this paper an account of 

 the eggs, larvK and nymphal forms of Enchcnopa Am. & Serv. 

 binotata Say. 



The nymphs of this form were the first known to me; and after 

 repeated and painstaking search I have succeeded in finding their 

 eggs and in rearing them. When I began, I had not seen the work of 

 Dr. I. A. Lintner in his bibliography from 1882 in Ins. N. Y., ist 

 Rep't, pp. 281-288. Dr. E. B. Felt recently called my attention to it. 

 In entomological works of later date I have found either no mention 

 of the eggs of this species, or the statement that the eggs are laid in 

 frothy masses on the twigs. This seemed strange to me, since I 

 found that the insects have a rather strong ovipositor. Two years 

 ago I examined a number of twigs richly covered with frothy masses, 

 kindly sent me by Dr. B. E. Dahlgren, of the Field Museum, of 

 Chicago, and by Mr. William Reiff, of Forest Hills, Mass., but a 

 careful examination of this material failed to reveal any eggs. 



Thinking that perhaps I had destroyed the eggs with the frothy 

 substance, I tried to find fresh material myself. While searching in 

 Central Park, New York, late in the autumn of 1909, I fortunately 

 found two females at work on sheepberry {Viburnum); one had 

 nearly finished forming the froth, the other had just begun. The 

 latter was within my reach, so I broke off the twig carefully and took 

 it home, together with the insect, and put it in a glass for closer 

 observation. This change did not interfere with her activities, which 

 indicates how absorbed these insects are in their work. The female 

 produced the frothy substance in the form of a kind of foam, but 

 eggs were not found in it. About three quarters of an hour is con- 

 sumed in completing this work, sometimes perhaps longer, depend- 

 ing on the size and numbers of the layers. Fig. i, PI. — , shows the 

 twig which I collected, somewhat enlarged, Fig. la, the mass that 

 was partly produced in captivity, and Fig. 2, the same mass much 

 magnified. The insect under observation died on the following da\'. 



During 1910, from May 28 to July 4, Dr. Dahlgren sent me four 



^ I wish to express my thanks to Professor Wm. M. Wheeler and Dr. E. B. 

 Southwick for kindly giving me much valuable advice in these studies. 



