___________„___ 15 



abscissa of radius angulated. Tibiae black or black-brown, the two front 

 tibiae sometimes fainter colored; tarsi more or less dusky j claws simple. 

 Abdomen highly shining, glabrous, longer than the head and the thorax 

 united; the second segment dorsally black or black-brown on the basal 

 two-thirds, on each side with a pubescent spot; the second segment is not 

 punctate and occupies a little more than the half of the entire 

 abdomen. Ventral-spine four to five times as long as wide. Length of the 

 female 3.5-4 mm. 



Gall. — This species forms on Quercus agrifolia and Q. crassipocula 

 rounded or elongated polythalamous twig swellings about 20-30 mm. in 

 length and 15-25 mm. in breadth, covered with the normal bark and 

 ligneous within; the numerous cells are elongate, 2-2.5 mm. in breadth, 

 thin shelled, close together, and nearer to the bark than to the inner pith 

 of the twig. 



1535 Synergus flavus n. sp. 



Pale yellow or reddish yellow; head distinctly broader than the 

 thorax, without earinae; front and vertex smooth, face and cheeks paler 

 yellow. Antennae of the male 15-jointeu, the two to three last joints more 

 dusky; second joint longer than thick; the third scarcely longer than the 

 fourth, faintl}^ emargined outwardly; the fourth twice as long as thick; 

 the. following ones gradually becoming shorter; the penultimate joint 

 is a little longer than thick, shorter than the last and all are very slender; 

 antennae of the female 14- jointed, filiform and slender; the third joint 

 fully thrice as long as thick, the following gradually decreasing in size, 

 the penultimate only one-third longer than thick, shorter than the last. 

 Mesonotum finely coriaceous; mesopleurae very finely longitudinally 

 striated; scutellum brownish red, rugose, the usual foveae small, not very 

 distinct, separated by a small carina. Metanotum brown or black-brown, 

 the earinae parallel. Wings hyaline, veins brownish. Tarsal claws simple. 

 Petiole of abdomen black, coarsely longitudinally striated; the second 

 segment reaching to the apex of the abdomen, smooth and not punc- 

 tured. 



Bred from galls of Callirhytis maeulipennis; the guests live in the 

 spongiose substance of the gall, outside of the cells and do not hinder the 

 development of the gall makers. 



