Pomona C'ollkge .J<irKN.\i. ok Kntomoloov 



587 



It will be my aim to coiitiniinlly im|)rovc this first nrliclr by ndding doscrip- 

 tions of new npliids, nntural cminies and better menus of nrtitieini eoiitrol. I 

 invite the aid of all growers and other interested parties and ask them to send 

 specimens wiiich have not been ineluded here, and I shall be )(iad to make anv 

 determinations of plant lice, |)rovided they are shipped in large (junntities' with 

 the host |)lnnt in a strong box so tliat the natural color and body shape can Ixi 

 studied in conneetion with tin- aiiatoniieal eharacfers.* 



Aphis cookii n sp. 

 win'UIlU vivii'Miors kkmalk. (Figure lyi A). 



lyid Aphis gossypii Glover-Essig, Pomona Jr. Ent. Vol. II.. pp. •i-i:i--i-H. 



Length of body not including style 1.7;> mm., width of nitsothorax O.T" mm., 

 greatest width of abdomen 0.78 mm., wing expansion T.-i' nun., rather large and 

 robust form. 





H 



Figure 191. Aphis cookii 



Prevailing Color — Dark gray or black with a whitish flocculence which makes 

 it appear whitish. Ilrad — Hlack or dark brown, nearly twice as wide as long, with 

 rather large .'intennal tubercles, but these are not at all promini-nt. A'yr* — Very 

 dark red or brown, terete tubercles extending nearly at right angles to the eye- 

 surface. .Ill If II line (Fig. 191. 1))- -On small frontal tubercles, not as long as 

 the body, reaching to the bases of the cornicles, very sparsely haired, dark 

 throughout, imbricated; lengths of articles: I. (1.08 mm.; II, 0.08 mm.; Ill, 0.35 

 nun. ; IV, o.JJ mm. ; V, 0.'2'2 nun. ; VI. O.ii mm. (spur 0..S mm.) ; total I..*!*) mm. It 

 will be seen from the above that I and II are coequal. III longer than either IV 

 or V, but shorter than \'l; IV and V coequal. The sensoria are distributed as 

 follows: Article III (Fig. 191, C, C) with from sevinteen to twenty-eight large 



