December, '12] gee: south Carolina scale insects 485- 



• The following is a list of the scale hisects with their host plants. 



1* Chrysomphahis aonidum, Linn, on Palm. 

 2* Chrysomphalus dictyospermi Morg. on Sabal Palm. 

 3 Chrysomphalus tenebricosus Comst. on Acer sp. 

 4* Aspidiotus hederce Vail, on Cycas revoluta. 



5 Aspidiotus forbesi Johns on Peach. 



6 Aspidiotus perniciosus Comst. on Peach, Plum, Apple, Pear, Rose, and Cherry^ 



7 Lepidosaphes beckii Newm. on Fig. 



8 Lepidosaphes ulmi Linn, on Pyrus malus. 



9 Chionaspis furfura Fitch on Pyrus malus. 



10 Chionaspis euonymi Comst. on Euonymus japonicus. 



11* Parlatoria pergandei var. close to camellioe on Euonymus japonicus. 



12* Parlatoria pergandei Comst. on Citrus lemonos. 



13 Fiorina them Green on Euonymus japonicus. 



14 Lecaniodiaspis tessellata Ckll. on Persimmon. 



15 Toumeyella liriodendri Gmel. on Liriodendron tulipifera. 



16 Saissetia hemisphaerica Targ. on Persea and Cycas revoluta. 



17 Pulvinaria vitis Linn, on Acer sp. 



18 Pulvinaria acericola Walsh and Riley on Acer sp. 



19 Pulvinaria camellicola (?) on Cornus florida. 



20 Lecanium corni Bouche on Elm. 



21 Lecanium nigrofasdatum Pergande on Plum. 



22 Lecanium quercifex Fitch on Quercus aquatica. 



23 Aulacaspis rosoe Bouche on Rose. 



24* Coccus hesperidum on Laurel and Cerimon. 

 25* Pseudococcus citri on Citrus aurantium. 

 26 Pseudophillipia quaintancei Ckll. on Pine. 



* Greenhouse species. 



General Behavior of Young of Lecanium quercifex Fitch. Eggs of 

 this species were hatching May 15, in such abundance as to afford 

 ample material for the study of some features of its behavior. While 

 not exhaustive in character, many of these results are new and of 

 considerable interest in the explanation of certain activities of not alone 

 this species of scale insects, but also many related ones. 



Phototaxis. To light of a 16 candle power intensity, the young, 

 insects showed a very marked positive reaction, orientation being very 

 decidedly parallel to the direction of the raj-s of light. A very few 

 specimens seemed entirely indifferent to the effect of the light raj^s, 

 but taken as a whole, the reaction reminds one very much of the effect 

 that the electric current has on Paramecium as described by Jen- 

 nings.^ Almost as soon as the light is placed at the other end of the 

 dish, the direction of the movement of the scale insect is reversed and 

 it again moves in the direction of the source of light. The scales of this- 

 form occur towards the outer portions of the twigs on the newer wood, 

 and the light reactions of the insect are no doubt an important factor 



I Jennings, H. S. Behavior of the Lower Organisms. New York, 1906. 



