840 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



small details. Dr. Fitch's original description of this insect, which 

 appears to have been unknown to Signoret. is as follows : '' The Willow 

 Coccus, C salicis, is ferruginous with obsolete black spots, has an oval 

 nearly hemispherii- form, and measures 0.20 in length, (No. 873). The- 

 Linden Coccus, C tillrf, the largest of our species that have been ob- 

 served, is ferruginous, hemispheric, and measures 0.24, (No. 874). Both 

 these species have the usual slit at the posterior end, and are wrinkled 

 transversely."* Miss Smith writes me that she has found innumerabilis 

 on willow in Chicago, so it remains a question whether salicis is really 

 a distinct species. It is also quite possible that C. tilice, if not a ieca- 

 nium, may be identical with P. innumerabilis. 



Pulvinaria vitis, Lmn('. This species is Uientioned by Fitch in his 

 Third Report, No. 96, as affecting the stalk of the grape. I find it also 

 mentioned in Walsh and Riley's American Entomologist, Vol. I, page 

 14, t and Vol. 11, page 276 ; and in the Country Gentleman of July 17th, 

 1879, there is a notice of this species by Dr. J. A. Lintuer, in which he 

 states that it is identical with a Coccus on tlie grape noticed in the 

 Country Gentleman for July 4th, 1878. This however, is an error, for 

 while the former is a Pulvinaria, the latter is very evidently a true Le- 

 canium, probably of the same species as one I have found quite common 

 on a wild grape vine [Vitis riparia, Michx.,) in this locality, and which 

 appears to be undescribed, though approacliing Lecanium mori Signo- 

 ret, of the mulberry in general appearance. As innumet obiHs is not in- 

 frequently found on the grape vine, it may be that some of these refer- 

 ences relate to that species. 



Lecanium macluro; Walsh and Riley. American Entomologist, Vol. I, 

 1868, page 14. This species was described in the same article with L. 

 acericola already mentioned, and is said to be fouud "inconsiderable 

 numbei's on the twigs and leaves of the osage orange at Wilmington, 

 and also in the vicinity of Alton, Illinois." The scale (?) is said to be 

 " of a blood brown color, as usual in the genus to which the insect 

 belongs," and the young larva? are said to be " remarkable for having a 

 longitudinal dark line along the back." This ''dark line" evidently 

 refers to the loop of the buccal setae in the abdomen, as all writers on 

 the CocciDvE who were unacquainted with the strrcture of this organ 

 appear to have fallen into the same error. The rest of the notice is quite 

 general, but together with the figure, shows it to be a true Pulvinaria. 

 As we have already seen, Mr. Riley now regards the species on osage 

 orange as identical with innumerabilis, and Miss Smith who has made a 

 comparative study of the two species during the past summer, writes 

 me that she also regards them as identical. Prof. Townend Glover in 

 the Beport of the Department of Agriculture for 1876, page 44, had already 

 suggested that acericola and mochirce were probably but varieties of acer- 

 icorticis Fitch. 



♦Fourth Report N. Y. State Cabinet of Natural History, p. 69. Albany, 18.51. 

 1 The species here spoken of 86 L. vitis is a Lecanium, and therefore Bot the true Pu[ 

 vinaria vitis. 



