April, '16] COCKERELL: GRASS-FEEDING MEALY-BUGS 313 



cus, but very distinct from P. timberlakei, especially in the character 

 of the antennae. The following measurements in microns are from the 

 specimen sent to me: hind tibia, 375; hind tarsus (without claw) 117; 

 hairs of anal ring, about 125; long caudal bristles about 180; antennal 

 joints, (1) 80, (2) 80, (3) 60, (4) 57, (5) 62, (6) 55, (7) 47, (8) 107. This 

 is . certainly not salinus; it appears to be related to P. marifimus 

 (Ehrhorn). 



Pseudococcus neomexicanus var. utahensis n. var. 



Female. Length 4.5 mm., width 2 mm ; claws without denticle, all the digitules 

 slender. Agrees in general with neomexicanus, but third antennal joint much shorter 

 than second, and equal with 4, 5 and 6. The following measurements are in microns: 

 hairs of anal ring about 107; long caudal bristles about 150; middle leg, femur with 

 trochanter, 195; tibia, 160, tarsus (without claw), 75; width of femur, 40; antennal 

 joints, (1) 42, (2) 42-45, (3) 25, (4) 25-27, (5) 25-27, (6) 25, (7) 35, (8) 72. Collected 

 Sept. 3, 1915. 



Mr. Timberlake's field notes are as follows: 



"On Elymus. Salt Lake City, Utah. This species was first noticed 

 by me about the middle of July, but no collection was made until 

 Aug. 14. Other collections were made Sept. 3, Sept. 20 and Nov. 23. 

 All the larger specimens were found concealed between the sheaths 

 and the stem, and hence they could not be observed in an undisturbed 

 condition. Apparently when the females reached a fairly large size 

 (about half grown) they became enclosed in rather thin cottony sacs 

 of rather close texture. A female that was removed from its situs and 

 placed in a vial, soon entirely enclosed itself in a cilindrical cottony 

 mass about 6 mm. long and 2 mm. in diameter. This sac was ap- 

 parently much more abundantly developed and certainly considerably 

 more fluffy than in specimens taken from the stems. Those in stems 

 were of course much flattened and the cottony secretion pressed to- 

 gether. A female with egg-mass of 103 eggs, collected on Nov. 23, 

 was found at one end of sac, and not covered up, at least when leaf- 

 sheath was torn away; neither were the eggs entirely covered up, 

 but the cottony fibers being sticky (but not viscid) tenaciously held 

 the eggs in place. The body coloration was not noted, certainly not 

 striking, and if I remember right pale yellowish. The females re- 

 moved from their sacs were covered with a thin white meal, and nearly 

 destitute of the usual lateral and caudal secretions. The exhausted 

 female found on Nov. 23 turned dull, dark, crimson-brown when 

 boiled in KOH. The egg was described as pale yellowish-brown, 

 darker at one end, about .4 mm. long by .2 mm. diameter." 



True P. neomexicanus, common in northern New Mexico, lives under- 

 ground on roots of grass, and is tended by Lasius. 



