312 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 9 



SOME GRASS-FEEDING MEALY-BUGS (COCCIDJE) 



By T. D. A. CocKERELL, University of Colorado 



I am indebted to Mr. P. H. Timberlake for some beautiful mounts of 

 certain grass-feeding mealy-bugs, which he wishes to mention by name 

 in an account of the parasites raised from them. They prove to belong, 

 to the group of Pseudococcus neomexicanus (Tinsley), but to differ from 

 any previously described. 



Pseudococcus timherlakei n. sp. 



Female. Body elongate, 2,016 microns long and 800 broad, as mounted; scattered 

 hairs and many small round glands, but no lateral patches of bristles; caudal region 

 with many glands, of two sizes, large and ring-like, and small with a distinctly cylin- 

 drical form; antennse wide apart (167 microns), 8-jointed; labium 112 microns long 

 and 72 broad at base; legs with long hairs, on under side of middle femur are seven 

 long hairs (75 microns), in two rows; no denticle on claw; anal ring with six bristles, 

 145 microns long; long bristles of caudal lobes about 195 microns. The following 

 measurements are in microns: middle leg, femur with trochanter, 250; tibia, 187; 

 tarsus (without claw), 80. Antennal joints: (1) 45-47, (2) 50, (3) 42, (4) 32-35, 

 (5) 35-40, (6) 32-35, (7) 37, (8) 80. 



Mr. Timberlake's field notes are as follows: 



"On salt marsh grass, Millbrae, California (near San Francisco), 

 Oct. 14, 1915. Half-grown specimens or larger were found in ex- 

 posed situations on blades or at axils of the blades, and females with 

 egg-masses on the same parts of the plant. The lateral and caudal 

 secretions of the active females closely resemble those of Pseudococcus 

 citrophilus Clausen figured on p. 20, Calif. Exp. Station Bull. 258. 

 (I made comparison with figure given as soon as I got back from the 

 field.) The egg-mass or sac is rather compactly matted, about 4 mm. 

 long and 1.5 in diameter, and the exhausted female lies exposed at 

 one end." 



The antennae agree with those of P. neomexicanus, but the other 

 characters are distinctive. The species is easily known from P. 

 salinus Ckll. (which may be found in quantity on grass at the edge of 

 the low cliff at the Scripps Institution at La Jolla, California) by the 

 much longer bristles of anal ring and caudal bristles, as well as by the 

 shorter first three antennal joints. 



Mr. Timberlake sent for comparison a slide marked "Pseudococcus 

 smithii (Essig), on Elymus, Ventura, Calif., Oct. 20, 1914 (C. P. 

 Clausen)." This is said to be the species described from examples 

 with 7-jointed antennse as Riper sia smithii Essig; Mr. Clausen found 

 that a considerable proportion of the specimens had 7-jointed antennse, 

 but 8-jointed specimens were not rare. The insect is a true Pseudococ- 



