SUBFAMILY KUWANHNAE 79 



only the type species. The adult female has an elongate oval body with 

 all the surfaces convex. The antennae consist of nine segments and are 

 articulated to the head near each other. The tarsal claws are without 

 digitules. The nymphs of the first stage do not have crab-like legs, their 

 femora and tibiae and tarsi are normal in form. The antennae in this 

 stage consist of six segments. The distal segment is greatly enlarged, 

 clavate, and longer than all the other segments together. In the other 

 nymphal stages the legs are wanting, the antennae are mere chitinized 

 points, and each of the four cephalic abdominal segments is provided 

 with a pair of spiracles. 



Steingelia Nassanow. The type of this genus, gorodetskia 

 Nassanow, was described from Russia. It was described a little later 

 by Green from England on birch as Kuwania britannica. Green considers 

 the two species as synonymous. The adult female of Steingelia is very 

 different in general appearance from either of those previously described. 

 The body is long and slender, three or four times as long as broad, and 

 the lateral margins are parallel or nearly so. The antennae consist of 

 eight or nine segments and are articulated to the cephalic portion of the 

 head and near to each other. The body of the adult female is greatly 

 shriveled during ovoposition and covered with a woolly secretion of wax, 

 forming an ovisac for holding the eggs. The ovisac may be placed in 

 crevices in the stems of old birch trees, but are found more abundantly 

 among the decayed leaves and debris at the base of the trees. The nymphs 

 of the first stage do not have crab-like legs. Their antennae consist of 

 six segments. The sixth segment is the longest, the second, third, and 

 fourth are the smallest, and the fifth is broadly dilated. 



Stomacoccus Ferris. There is a single species, platani Ferris, 

 from California on Platanus. Its most distinctive feature is the reten- 

 tion of mouth-parts in the adult female. The body is elongate as in the 

 other species of the subfamily. The thoracic legs are wanting in all 

 nymphal stages but the first. This character will have to serve for 

 differentiating the genera of this subfamily from the Monophlebinae. 

 The single species differs from Steingelia in having a single row of 

 setae on each side of the ventro-meson of the abdomen, while there are 

 two rows on each side in Steingelia. There are six ungual digitules in 

 Stomacoccus, eight to ten in Steingelia, and none in Kuwania but its 

 claws are toothed. Kuwania has a group of about eight tenent setae on 

 each coxa which are wanting in Stomacoccus. The insect apparently 

 passes the winter upon the bark, migrating onto the leaves in spring. 

 They live exposed upon the underside of the leaves. The males are very 

 active. This genus was overlooked until after this chapter was in type. 



