76 OHIO STATE ACADEMY OF SCIENCE. 



of the second, third and fourth lobes respectively. Four groups of 

 circumgenital gland orifices, each of about 7, but varying from 5 — 10. 



Remarks : This species infests Citrus trees in Florida, oc- 

 curring in Ohio only under glass. Being so nearly the color of 

 the bark, it is scarcely noticeable until a tree is badly infested. 



Parlatoria zizyphus (Lucas). 

 Fig. 23. 

 Coccus zizyphus Lucas, Ann. Soc. Ent. Fr., (3), i, xxviii. (1853). 

 Parlaioria zizyphi Comst., 2nd Rep. Dep. Ent. Corn. Univ., p. 115 

 (1S83). 



Scale of female: The scale is almost covered by the very black 

 exuviae, the first being oval and the second quadrangular. On the 

 middle line is a ridge in a longitudinal depression. 



Scale of male: Long, parallel-sided, light-bi'own, terminal exuvia 

 black. 



Female: Similar to female of P. pergandii, except that the three 

 segments preceeding the last bear numerous irregularly incised plates, 

 and the fourth lobe is long and sharp-pointed. The lobes are somewhat 

 smaller than in P. pergandii. 



Remarks : This species is a native of Europe, infesting 

 orange and lemon trees, and is frequently seen on imported fruit 

 in the markets. 



DIRECTIONS FOR COLLECTING AND MOUNTING COCCIDAB. 

 A few words in regard to collecting Coccidae might be fit- 

 ting and helpful to beginners. Coccidae are seldom found in this 

 region on anything except trees and shrubs, although many her- 

 baceous plants are infested by Aphids and Aleurodids. Perhaps 

 the most satisfactory method in collecting scale insects in the 

 field, is to put them in envelopes, properly labeled, until the 

 collector can procure suitable glass tubes or bottles, which should 

 contain all data upon a slip of paper. Until the material is per- 

 fectly dry, a plug of cotton should be used ; otherwise the contents 

 will soon moidd. Finally: when you have collected as much of 

 any species as you think necessary, collect as much more, it will 

 never come amiss; in other words, always collect plenty, if 

 possible. 



If the specimens to be mounted belong to the Diaspinae, care- 

 fully lift the scale revealing the small flat inset beneath, which 



