260 PROCEEDINGS OF THE ACADEMY OF [1899. 



3. Skin very thickly covered with short hairs; antennae long, none 

 of the segments, unless the first, twice as broad as long, those 

 after the sixth conspicuously longer than broad; eleventh 

 narrow, cylindrical. 192 ij. long. Llaveia primitiva (Twns. ). 

 Skin with very many round glands, but hairs very minute, 

 sparse, scarcely noticeable; autennse shorter, the first 8 seg- 

 ments twice as broad as long; 9 and 10 considerably broader 

 than long; 11 oval, . . . Llaveia mexicanoruin (CkW.). 



The antennpe and legs of primitiva and mexieanormn are very 

 dark sepia brown, even in the immature stage; this is very differ- 

 ent from the clear ferruginous of axin. The antennae of the third 

 stage of axin are of the type of mexieanormn, but the skin is very 

 hairy as in primitiva. 



Margarodes polonicus (Linn.). 



Porphyrophora polonica Auct. 



The genus Porphyrophora Braudt is essentially the same as 

 Margarodes, the latter name having priority. There is a good 

 figure of both the ? and the * ' pearl ' ' of M. polonicus in Van F. 

 Houttuyn's Natuurlyke Historie, 1766, Vol. 10, pi. Ixxxiii. 



COCCUS Linn6. 

 Syst. Nat., Ed. x, 1758, p. 455. 



The first species mentioned is hesperidum {Lecaniimi). The last 

 is cacti. The other species belong to Chrysomphalus, Kernies, 

 Pulvinaria, Mytilasjns, Chionaspis, Eulecanium, Ceroplastes, Por- 

 phyrophora and some Dactylopiiue genus. The Coccus cacti of 

 Syst. Nat, ed. x, is a Monophlelid, so the Coccus of Signoret is not 

 the Linnean genus in any sense. The first to divide Coccus L. 

 Avas GeofFroy, who used Chermes for the Lecaniinse and Diaspinaj 

 (this is not the true Chermes Ijinn., which is Psy Ha), and restricted 

 Coccus to Ihe Coccince. Under Coccus he described three species, 

 C. adonidum, etc., which is a Dactylopius, C. phalaridis which is 

 some Dactylopiid, and C. ulmi, etc., which is Gossyparia. Only 

 one of these is in the Syst. Nat., ed. x, and that is j^halaridis, 

 which thus becomes the type of the genus. For a description of 

 C. phalaridis we may refer to the Fauna Suecica, ed. 1761, p, 266. 

 It is said to live at the roots of Phalaris eanariensis, and to be 

 attended by Formica rubra. The description runs: " Animal 

 maguitudine seminis cannabis, exalbidum, solis pedibus parum 



