146 Memorias de la Sociedad Científica 



ephedrae, and are similar to no otlier species, except tlie Bra 

 silian P. magnolicida [( Von Ihering M S. ), which differs suf- 

 fieiently in its larger legs and more hairy body. The other 

 oharacters of the mexiean species also agree so nearly with 

 those o£ P. epJiedrae that it is impossible to regard the f ormer 

 as more than a variety, which may be described as follows. 



Pseudococcus ephedrae (Coquillet), variety. 



Femal^, About 3^ millim. long, 2 broad, red-brown, with 

 a mealy covering, 



Skin with small round glands and scattered hairs. Labium 

 tow-jointed,pointed, about orover twice as long as thebreadth 

 of its base. No caudal tubercles; anal ring with six long hairs. 

 Leg-bristles small, fairly numerous, about 16 in a row on iu- 

 ner side of tibiaj tarsal digitules with fine hairs, with very 

 minute knots; claw without aiiy denticle on inner side. 



Middle leg measuring in fx: fémur + trochanter, 390; tibia, 

 300; tarsus ( without claw), 100, width of fémur 96, of tarsus 

 about 45^1. Antennae 8 jointed, sometimos appearing nine- 

 jpinted by the división of the last joint, 



Measurements of antennae and legs, compared with the 

 Californian P. ephedrae. 



Joints of Antennae. (Ij (2) (3) (4) 



P. epTíedrce, México....69 to 75....87 to 95....84 to 95.-..60 to 65 

 P. ep7^ecfrcB, California . ? 86 86 75 



Joints of Antennse. (5) (6) (7) rS) 



P. epTieíircE, México....60to72....54to57....54to58....108toll4/i 

 ' P. ephédtce, GsHiovma. . 77 .... 60 .... 56 .... 112 



Anterior legs. Fémur + trochanter. Tibia. Tarsus. 



P. epliedrce, México 315 250 96 



P. ephedrae, California 344 249 99 



Of course these measurements vary somewhat with difEe- 

 r.ents individuáis. 



