26 CALIFORNIA STATE COMMISSION OF HORTICULTURE. 



slender and well curved. Digitules long fine knobbed hairs. Anal ring 

 small, with six fine hairs. Caudal lobes well develoi^ed, with very long 

 setse (280/^). Groups of spinnerets, conical spines, and long slender 

 hairs scattered over the dorsum. 



On Qiiercus cJirysolepis. 



Pseudococcus ryani Coq. 



This species is known as the cypress mealy-bug and is held in almost 

 complete subjection by the Coccinellids (ladybirds), Rhizohius ventralis 

 and Exochomus marginipennis. Of the sixteen species of Pseudococcus 

 found in California, P. cltri, P. longispimis, and P. aurilanatus are the 

 most troublesome, although where New Zealand flax is grown P. calceo- 

 larise is very abundant. 



Erium eriogconi Ehrh. 



Female. — Inclosed in a densely woven white felt sac about 2^ mm. 

 long and 1mm. broad; also secreting considerable loose cottony matter. 

 Color light yellow, slightly covered with white powder, about 2 mm. long 

 and 1 mm. broad. Last segment of body with two short white filaments. 

 Legs and antennae light brown. Young larvae and eggs light yellow. 

 When boiled in KHO, turns brown. Numerous very fine slender 

 spines on dorsum. Antennae 7-jointed, quite bristly. Sequence of the 

 joints of the antennae is quite variable. Joint 7 longest, then comes 3, 

 then 1 and 2, but these are sometimes longer than 3. Joint 4 is next, 

 but sometimes joint 6 is longer. Joint 5 is generally shortest. Formula, 

 approximately: 7 3 12 4 6 5. Legs small and rather slender; femur, 

 tibia, and tarsus all bearing rather large stout bristles; femur twice as 

 long as tarsus; claw slender. Tarsal digitules long, slender, slightly 

 knobbed. Digitules of claw slightly longer than claw, slender, knobbed. 

 Anal lobes not conspicuous, bearing a long, rather stout seta, several 

 stout conical spines, hairs and spinnerets. Anal ring median, with 

 the usual six hairs. 



On roots of Eriogonum sp. 



Ripersia villosa Ehrh. 



Female. — In clusters and single in the crotches of twigs of oak. Sac 

 loosely woven of long white wool, oval, about 2 mm. long and 1 mm. 

 broad. 



When removed from sac bright crimson, slightly covered with 

 white powder, skin shiny; about 1.5 mm. long, 1 mm. broad, tapering 

 anteriorly and quite convex dorsally. When boiled in KHO, derm 

 colorless, densely covered with slender hairs. Antennae light brown; 



