438 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 2 



SO far as possible on many food plants. Resulting variations secured 

 by transference to different food plants, were fully as remarkable as 

 observed in the case of Pulvinaria vitis (L.). 



The Long Soft Scale 



Coccus elongatus (Sign.) 



Plate 19, Fig. 12 



Lecanium elongatum Sign., An. Soc. Ent. Fr., 5, III, p. 404 (1873). 

 Lecanium longulum Dougl., Ent. Mon. Mag., XXIV, p. 97 (1887). 

 Lecanium cMrimoliw Mask., N. Z. Trans., XXII, p. 137 (1889). 

 Lecanium ficus Mask., Ent. Mon. Mag., XXXIII, p. 243 (1897). 

 Lecanium frontale Green, Cocc. Ceylon, pt. Ill, p. 192 (1904). 



This species is quite similar in general appearance to C. hesperidum 

 with its color variations, but is elongate elliptical to varying degrees, 

 depending upon the exigency of location; and is ordinarily rather 

 more convex than the latter species. The eight-segmented antennae 

 will identify it easily from those of hespendum with but seven. The 

 latter species has but four fringe spines arranged in a transverse line 

 about midway across the anal plates, while there are eight in elongatus. 



The specific name elongatum Sign., takes precedence over longulum 

 Dougl., since an examination of specimens from Signoret in the Fitch 

 collection verifies this synonymy. L. chirimolice and L. ficus of Mas- 

 kell are also synonyms. L. frontale Green has been a puzzle for some 

 time because the writer could find no morphologic characters to dif- 

 ferentiate it from elongatus, except its more narrow form. But the 

 discovery of elongatus on leaves of Anthurium, Calophyllum and 

 Croton exhibiting all the forms connecting the typical elongatus and 

 typical frontale has cleared the situation. On these plants the young 

 scale has settled close to the high midribs or larger veins and its 

 development has been more linear than usual, resulting in the greater 

 length of body anterior to the antennae and posterior to the anal 

 plates. In all microscopic characters — derm pores, antennae, legs, 



Explanation of Plate 20 



Photomicrographs showing characteristic derm pores; all at same magnifi- 

 cation. 



1. Eucalymnatus tessellatus (Sign.). 



2. Saissetia olew (Bern.). 



3. Saissetia nigra (Nietn.). 



4. Saissetia hemisphwrica (Targ.). 



5. Toumeyella liriodendri (Gmel.). 



6. Neolecanium cornuparvum (Thro). 



