96 INSECTS NOXIOUS TO AGRICULTUKE. 



Allied to E. buxi, Signoret (European), and E. multispinus, 

 ante : but different from both in colour, in the arrangement of 

 the spines and spinnerets, and in the form of the antennae. 



Genus : RHIZOCOCCUS, Signoret. 



Adult females naked, usually stationary ; body segmented ; 

 anal tubercles conspicuous. Antennae of six or seven joints. 

 Feet present. Anogenital ring inconspicuous, with fine hairs. 



Male pupa enclosed in a cottony sac. 



Mr. Comstock proposes (Ann. Kept, of Entom., U.S. Ajrric. 

 Dept., 1881, p. 339, note) to include in this genus all the species 

 of Eriococcus. The organic difference disclosed by the forma- 

 tion of a sac in that genus and the absence of a sac in 

 Rhizococcus seems to render the separation of the two necessary. 



58. RHIZOCOCCUS CELMISI^K, Maskell. 



N.Z. Trans., Vol. XVI., 1883, p. 135. 



(Plate XVI., Fig 1.) 



Adult female deep reel in colour, elongated - oval, convex 

 above and flattened below ; length a,bout -j^in. The segments 

 of the body are not very distinct. The abdomen ends in two 

 large and conspicuous anal tubercles, each of which bears one 

 strong and fairly long terminal seta and three other spines. 

 The anal ring has eight hairs. Antenna; of six joints, some- 

 times looking like seven. Mentum doubtfully dimerous. The 

 four digitules of the foot are long fine hairs. The tibia is a little 

 shorter than the tarsus.* The trochanter bears one long hair 

 and two short ones. A few large conical spines (spinnerets) are 

 scattered over the body, and a row of smaller ones, like hairs 

 with tubercular bases, runs transversely on each segment ; also 

 some circular spinnerets. At the edge of the body, all round, is 

 a row of the large conical spines, which are set in groups of 

 three on the posterior segments, of four or five on the median 

 segments, and almost continuous on the head. When the insect 

 is alive these spines are often agglutinated with cottony secretion 

 so as to give the appearance of a short fringe. The four 

 spiracles are somewhat large and circular. 



Adult male unknown. 



Habitat On Celmisia sp., Southern Alps, Canterbury. 



* See note, above, under Eriococcits multispinus. 



