ERTOPELTIS FESTUC^l. 25 



new species of Rhizococcus, and is said to occur in 

 Dakota, Indiana, and Illinois." 



With regard to Eriopeltis Lichtensteinii, I should add 

 that Signoret, in his ' Essai,' p. 445, refers to two very 

 distinct types of ovisacs in Eriopeltis festucse, one having 

 the sac formed of curly woolly filaments, the other, on 

 the contrary, being very densely felted. This latter 

 form he considered distinct, and named it Eriopeltis 

 Lichtensteinii, at the same time reserving the name 

 fest'ucsR for the typical species of Boyer de Fonscolombe 

 possessing the ovisac formed of curly woolly filaments. 

 Unfortunately Signoret did not examine the insect, 

 and we have no further particulars concerning it. 

 Mr. Douglas* has treated the subject at some length, 

 and in his conclusive remarks says : " I cannot find 

 that Signoret ever made his promised investigation, 

 which is to be regretted. He may be right in his 

 suggestion of two species, but the conclusion I arrived 

 at, pending further elucidation, was that the felted 

 sacs found in July are either the same as the long-wool 

 ones found in October, but abraded during the winter, 

 or, more probably, that they have been produced after 

 hibernation from the eggs contained in the latter, and 

 are the growth of the year ; this latter proposition is 

 more consonant with the economy of the Lecanina. 

 The question is open for future investigation ; in the 

 meantime we have, nominally, two species." For a 

 number of years past I have had the ovisacs of 

 Eriopdtis festucdB under close observation, and have 

 invariably found that when first formed the exterior is 

 composed of very long curly or straight woolly fila- 

 ments (PL XXXVIII, figs. 1, la), but these delicate 

 filaments very soon disappear, and the sac then 

 presents a closely-felted surface (fig. 1 b) such as 

 Signoret describes. On these grounds I am confident 

 that E. Lichtensteinii should be placed as a synonym 

 of E. festucde. 



* <Ent. Mo. Mag./ vol. xxiv, p. 166 (1887). 



