16 PROC. ENT. SOC. WASH., VOL. 23, NO. 1, JAN., 1921 



With material of the type of the genus at hand together with 

 two other species from pines in America, the genus may now 

 be redescribed so as to include all of them, as follows: 



Coccidae referable to the subfamily Margarodinae, i. e., adult female and first 

 larva with legs and antennae, and at least one intermediate stage without these 

 appendages. 



Adult female elongate, broader posteriorly, with 9-segmented antennae, the 

 latter transversely striated, except 1st and 2d segments. Legs well developed, 

 also transversely striated. Tarsus attached at apex of tibia and strongly curved 

 outward; with spines on inner margin ot tibia, two hair-like digitules on tarsus 

 and two knobbed digitules on tarsal claws. Without marsupium or anal tube. 

 Mouthparts sometimes present. 



Intermediate larval stage without legs, antennae or anal tube, the only con- 

 spicuous characters being mouthparts and spiracles. First stage larva with legs 

 and 6-segmented antennae. All three stages possessing two thoracic and seven 

 abdominal pairs of spiracles. 



This genus is probably most closely related to Kuwania, 

 Steingelia and Stomacoccus, all being without a marsupium or 

 anal tube, but differs from them in several respects. The adult 

 female, instead of bearing knobbed digitules on the tip of the 

 tibia as in Kuwania, possesses a number of spines on the inner 

 margin. The apodous larva of Kuwania also possesses only 4 

 pairs of abdominal spiracles, these on the first 4 abdominal 

 segments. Matsucoccus differs from Steingelia and Stomacoccus 

 in the number of antennal segments, the transversely striated 

 legs and antennae and in having the anterior pair of legs normal 

 in size. The tarsus and claw of the adult female bear only four 

 digitules. The marsupium is lacking, in which respect this 

 genus differs from Callipappus and Xylococcus. It also differs 

 from the latter in that the anal tube is lacking. The mouth- 

 parts are sometimes present as is the case with several other 

 genera referred to the Margarodinae. 



It has been noticed that the antennae of those adult females 

 which have not yet emerged from the skins of the apodous larvae, 

 are retracted. That is, they are pulled back into the body, the 

 distal half being within the basal halt, the latter turned inside 

 out. 



In each of the species, the first exuvium is cast in a different 

 manner, matsumurae rupturing on the ventor, fasciculensis on 

 the cephalic end, and acalyptus on the dorsum. 



Key to the Species. 



A. Adult female with a pair of heavy spines on 5th to 9th antennal seg- 

 ments; apodous larva oval, with all spiracles forming an acute angle 

 with the surface; first stage larva with bases of antennae approximate, 

 and exuvium rupturing cephalically; occurring within fascicles of 

 pine needles in California... ..fasciculensis Herbert. 



