INSECTS. ETC IXJURIOTJS TO VARIOUS CROPS IO61 



The principal hosts of P. citri arc Asparagus officinalis; Strelitzia gi- 

 gantea (bird of paradise flower) ; Callistemo)t lanceolatus (bottle brush) ; 

 Bouwardia sp. ; Umbellularia californica (California laurel) ; Cestntm spp. ; 

 City us medica var. genuina ; Coffea arabica ; Coleus Blumei ; Columhium 

 sp. ; Gossvpium peruviamim ; Geranium sp. (cranesbill) ; Cuatmis sativns ; 

 Ceanothus integerrimus (deer brush) ; Cordvline tcminalis ; Hedera Helix ; 

 ferns ; Fuchsia s-p. ; vine ; Passiflofa edulis ; Jasmin ; Plumbago sp. (leadwort); 

 lemon tree ; magnolia ; Ipomoea Bona-nox (moonflower) ; nettle ; Solanum 

 Douglasii (nightshade) ; Nerium Oleander ; orange tree ; Panax monstrosa ; 

 Paeonia spp. ; Solanum muncatum ; Phyllanthus carolinensis ; Etiphorbia 

 pulcherrima ; Citrus deciimana (pomelo) ; potato ; Solanum jasminoides ; 

 gourd ; Passiflora violacea ; Sequoia sempervirens (redwood) ; Begonia sp. ; 

 Tacsonia jasminoides ; tobacco ; Cyperus alternifolius (umbrella plant) and 

 Zebrina pendida (variegated wandering Jew). 



(2) P. hakeri Essig. — Was first discovered on Sambucus glauca (elder) 

 in the neighbourhood of Santa Paula, county of Ventura, whence it made its 

 way into the counties of Santa Barbara, I^os Angeles, Orange, San-Diego, 

 Riverside and vSan Bernardino. 



The injuries it occasions are the same as those of P. citn. The larvae 

 and adults attack by preference the tender leaves full of sap, where they 

 gather in numerous colonies. 



Hosts : apple ; Aesculus californica (bucke^'e) ; Umbellularia califor- 

 nica ; Aleurites triloba (candlenut) ; Agave americana ; Coleus Blumei ; Ce- 

 stntm sp. ; Cordyline terminalis ; Sambucus glauca ; ivy ; Enterolobium sp. ; 

 Erigeron canadensis (horseweed) ; Iris ; Cydonia japonica ; lemon tree ; 

 Lilium Parryi (lemon lily) ; Phaseolus lunatus (Ivima bean) ; Choisya ter- 

 nata (Mexican orange) ; nettle ; Solanum Douglasii ; orange tree ; pear tree 

 Solan nni jasminoides; Salix sp. ; Helianthns annuus ; walnut; Grevillea ro- 

 busta (silk oak). 



(3) P. citrophilus Clausen Mss. ■ — First appeared in 1913 near Uplands, 

 county of San Bernardino. Was mistaken for P. citri, causing much anxiety 

 to the local fruit growers. The injury it causes is never serious. It may 

 at most occasion the fall of some flowers or young fruits of the lemon tree 

 and discolouring of the orange tree fruit, but always to a very limited 

 extent. 



Hosts : Azalea ; Rubus villosus ; Ficus pumila (climbing fig) ; fig tree ; 

 iv\' ; heliotrope ; lemon tree ; orange tree ; mallow ; Choisya ternata; Bras- 

 sica liigra : Solanum Douglasii ; Schinus Molle (pepper tree) ; Chenopodium 

 album (pigweed) : walnut ; Melilotus alba ; potato ; Rubits nutkanus ; rose 

 bush; rhubarb; Loliiim perenne; Ctevillea robusta; Helianthus annuus. All these 

 plants are not equally frequented. The presence of Ps. citrophilus is 

 rather rare on some of them. Others, however, such as the potato, rhubarb 

 and Grevillea are more often attacked than citrus plants. 



(.1) P. Longispinus Targ. - — Common throughout Southern California, 

 in the counties of vSanta Barbara, Ventura, Los Angeles, Orange and San 

 Diego. 



Hosts : Begonia spp.; Strelitzia gigantea ; Richardia africana (calla) ; 



