1899.] NATURAL SCIENCES OF PHILADELPHIA. 271 



Lecanium ulmi (Gmelin). 



Coccus ulinl Gmel., Syst. Nat., p. 2217 (not Coccus ubni L.)- 

 This is the Lecanium fasciatum Costa, with transverse brown 

 bands in the manner of L. perornatum. It is DeGeer's Coccus 

 ovatus albus fuseo transverse striatus, ulmi, figured on pi. 28, f. 7. 

 It is also the Chermes ulmi rotundus of Geoffroy, and Olivier' s 

 Chermes ulmi. Olivier says he found it in Holland in May, 1735. 

 Douglas {Eat. 3fo. Mag., September, 1886, p. 79) remarks that 

 in England are found only wholly brown scales of L. ulmi, such 

 as were also known to Signoret in France. He queries whether 

 the bands may not be peculiar to the immature stage, but it seems 

 probable that they are retained to the last, as in L. perornatum. 

 In that case the English L. ulmi will require a new name, being 

 apparently a distinct species; unless, as Douglas suggests, it may 

 be identical with L. alni (Modeer). 



Lecanium liriodendri (Gmel.). 



Coccus liriodendri Gmelin, Syst. Nat., 1788, p. 2220. 



It has long been supposed that this might be identical with our 

 L. tulipifene Cook, but nobody appears to have been able to con- 

 sult the description (Hamburgisches Magazine, xii, 1753, pp. 

 3-24) quoted by Gmelin, on which the specific name is based. 

 Fortunately I have been able to obtain the work at the Library of 

 Congress; it proves to be an article by Dr. John Hill, of London, 

 relating to a Lecanium he found on the tulip tree in a plantation 

 of American trees at Goodwood; and afterwards, on the same 

 kind of tree, in Burlington Gardens, Chiswick, England. Not 

 being able to make very much out of the article myself, I asked 

 Mr. Pergande to read it, which he did, also without any definite 

 result. It is plain that the insect was a Lecanium, and it is per- 

 haps probable that it was Ij. tulipiferce, but the description is so 

 vague, besides containing some apparently inaccurate statements, 

 that there can be no certainty. It is, however, very desirable that 

 some one should ascertain whether any tulip trees (Ijiriodendro)i) 

 are still living at the places named, and, if so, whether they are 

 infested by this Lecanium. 



Lecanium castilloae Ckll. 



I have examined a mount of the second stage, prepared by Mr. 

 Pergande from some of the original material collected by Prof. 



