8 BULLETIN 838, IT. S. DEPARTMENT OE AGRICULTURE. 



hederae (Vallot). and Aspidiotus ehrharni Coleman. Xone of these 

 have been noted doing any considerable damage. 



Still other associated insects of various orders are : Phynwtodes 

 nitidus Lee. Atimia confma Say, TrachyTcele hlandeli Mars., the 

 cypress moth [ArgyrestMa cupresseUa YTals.). the cypress cone- 

 borer (Cydm cupressana Kear.). a horn -tail wasp (Sirex ccMfomi- 

 cus Ashm.). the arborvita? plant-louse {Lachniella iujaf.lina Del 

 Guer.), and an undetermined tussock moth. 



FOOD PLANTS. 



The known food plants of the cypress bark scale are: Monterey 

 cypress {Cupressus maerocarpa Hartw.). Arizona cypress (C. ari- 

 zonica Greene). Guadalupe cypress (C. guadolupensis 'Wats.), and 

 incense cedar {Libocedrus decurrens Torr.). On one other tree, a 

 deodar cedar (Cedrus deodara Loud.), at Santa Rosa, Calif., a dead 

 male was found in its cocoon. 



It seems strange that the scale insect should not occur on all 

 species of cypress if it will infest two trees as different as Monterey 

 cypress and incense cedar, yet Italian and Oriental cypresses, two 

 varieties of Cupressus sera pervi 'reus, are immime to the attack of this 

 insect. They have been found in many instances in close proximity 

 to infested Monterey cypresses and entirely free from the scale insect. 

 In one case, in the Benicia Cemetery, 27 cypresses formed a square 

 about a plot. Two-thirds of these were Monterey cypresses, with 

 every third tree an Italian cypress, touching a Monterey cypress on 

 each side. Every Monterey cypress was infested and dead or dying, 

 while not a scale gould be found on the Italian cypresses. 



Specimens of Himalayan cypress (C. torulosa Don.), Macnab cy- 

 press {C. maenallana Murray), funeral cypress (C. junebrls Endl.), 

 Sargent cypress (C. sargentu Jepson). and Port Orford cedar 

 (Chamaecirpar'is lawsoniana (Murr.) Pari.) have been examined, 

 although not in large numbers, within the infested areas, and no 

 cypress bark scales could be found upon them. 



DESCRIPTION. 1 



THE EGG. 



Egg (PI. IV, A), immediately after being deposited, regularly oval, smooth, 

 and shiny, of a transparent pale yellow color, with eyes of embryo visible 

 through membrane as two dark spots near one end. Average length of seven 

 eggs 0.34 ; mm. ; width 0.14. 



LARVA. 

 F1EST INSTAB. 



Young larvae (PI. TV, B) of both sexes alike. Pale yellow in color, with 

 long, flat, oval bodies 0.43 mm. in length. 0.20 mm. in width. Antennae (PI. V. 



1 The following detailed description of all stages from the egg to adult, both male and 

 female, were made from living and freshly mounted material collected during the study 

 of the cypress bark scale. 



