COCCIDAE OF OHIO. 41 



Pseudococcus citri (Risso). 



(Mealy Bug) 



Figs. 46, 47, 48. 



Dorthesia citri Risso, Essai, Hist. Nat. cles Oranges (1813). 



Dactylopius citri Sign., Ann. Soc. Ent. Fr., (5) v, p. 312 (1875). 



DciGtylopius destructor Comst., Rep. U. S. Dep. Ag., 1880, p. 342 

 (1881). 



Adult female: Length 3.5 — 4 mm., width 2 — 2.5 mm., white or 

 yellow with, brownish tinge, darker than P. longispinus, and with less 

 powdery secretions covering body. The seventeen lateral appendages 

 are short and blunt; posterior appendages not much longer than 

 lateral ones. Antennae 8-jointed, less pubescent than in P. longispinus; 

 formula: 832 (17) (5G4). The penultimate segment bears on either 

 side a very long seta, and two or three very short ones, and two conical 

 projections, the surface of the segment is dotted with orifices. Six 

 slender setae, one-half the length of the setae on the penultimate, are 

 borne by the ano-genital ring, which is somewhat projected from the 

 penultimate segment. 



Remarks: This species differs from P. longispinus by the 

 absence of the long filaments at the posterior end of the body. 

 The female is oviparous, laying her eggs in a cottony sac, which 

 increases in size with the growth of the adult female, 



Pseudococcus longispinus (Targ). 

 Figs. 49, 50, 51. 



Coccus adonidum corpore roseo, etc., Geoff., Abr. Ins., i, p. 511 

 (17G2). 



Dactylopius longispinus Targ., Catalogue, p. 32 (1869). 



Dactylopius adonidum Comst., Rep. U. S. Dep. Ag., 1880, p. 341 

 (1881). 



Female: Length, 2.5 — 3 mm., width, 1.5 — 2 mm. White or tinged 

 with yellow, with brown band on middle of back; each segment with 

 a white waxy filament, which forms a border of appendages of varying 

 lengths around the body; those near the posterior extremity longer, 

 and four at caudal end very long, the inner the longer, sometimes 

 longer than body. Entire body appears as if dusted with flour, which 

 Is caused by the waxy secretion. Antennae 8-jointed, each joint bearing 

 several hairs. Formula: 8, (2, 3,) (1, 5,) (4, 6,) 7. The legs are long, 

 stouter than in P. citri, somewhat pubescent; tibia twice as long as 

 tarsus. The penultimate segment presents on either side a rqunded 

 group of pores and two short, strong spines, also a seta somewhat 

 longer than the anal setae, and several shorter setae. Anal ring large, 

 ■dotted, with six long setae. 



