432 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 2 



of this genus exhibiting the very long caudal waxy filaments, and one 

 is pretty safe in identifying as this species the common longtailed 

 mealy-bugs of our greenhouses. It occurs on many plants but its 

 range of hosts is hardly as great as that of the short-tailed species, 

 Psendococcus citri. 



There are seventeen white waxy marginal filaments of various, 

 lengths on each side of the body which is covered lightly with powdery 

 wax. The four posterior filaments are sometimes longer than the 

 body. The segments are quite distinct. On each side of the anal 

 lobes are two microscopic sharp spines surrounded by a circle of 

 closely-grouped pores, easily distinguishable from the scattered ar- 

 rangement in citri. 



There is no reason why Linnaeus' name of this insect should be 

 discarded in favor of longispinus Targ., when we have such a good 

 description of the insect in Systema Naturae, Ed. XII, even though the 

 name had been used previously in Fauna. Suecica and omitted from 

 Ed. X. 



Bouche's species liliacearum and fuliparum, are undoubtedly syno- 

 nyms differing according to description only in size, and both occur 

 on plants of the same group and under similar conditions. Bouche 

 says they are near adonidum. Coccus zamioi Lucas was described 

 from Zamia australis and Z. spiralis, plants originally from Australia, 

 but growing for some time in the Paris Botanic Gardens where 

 adonidum was abundant. The writer has seen Zamia sp. literally 

 covered beneath with Pseud, adonidum and Saissetia hemisphcerica 

 (Targ.). 



Maskell in 1895 [Ann. Mag. N. H., 6, XVI, p. 133 (1895)] con- 

 sidered Dact. liliacearum, D. tuliparum and D. hoyce to be synonyms 

 of D. adonidum (Linn.). 



The Short-Tailed Mealy Bug 



Pseudococcus citri (Risso) 



Plate 19, Fig. 2 



Dorthesia citri Risso, Essai, Hist. Nat. des Oranges (1813). 



Coccus citri Bdv., Ent. Hort, p. 348 (1867). 



Dactylopius citri Sign., An. Soc. Ent. Fr. (5), v. p. 312 (1875). 



Lecanium phyllococcus Ashm., Can. Ent, XI, p. 160 (1879). 



Dactylopius brevispinus Targ., Annali di Agr., p. 137 (1881). 



Dactylopius destructor Comst., Rep. U. S. Dep. Agr., 1880, p. 342 (1881). 



Pseudococcus citri Fernald, Cat. of Coccidfe, p. 99 (1903). 



This very common mealy-bug infests so many species of plants that 

 it would be much easier to list those not affected, so omnivorous is it 



