559 



life; tegulae and legs, except hind coxae, pure pale yellow, with the tip of 

 the last joint of tarsi blackish; basal third of abdomen yellow, the 

 metallic green sometimes extending narrowly along the sides to the base; 

 wings hyaline, the veins very pale yellowish. 



Fig. 1. Ootetrastichus fonnosanus, female. 



More rarely the lower part of the face and the cheeks are yellowish, 

 and in one specimen from Tainan, Formosa, the thorax is metallic bluish 

 instead of green. 



Head somewhat wider than the thorax, the face above antennae and 

 the fronto-vertex collapsing after death; the cheeks a little over three- 

 fourths as long as the eyes and about as wide as long; genal suture 

 distinct, running from the base of the mandibles to the lower corner of 

 the eyes, where it furcates, a branch following the eye-margin for a short 

 distance in both directions; the postorbital area wide and forming with 

 the postsutural part of the cheeks in side view of the head a broadly 

 lenticular area, the inner margin of which is more convexly curved than 

 the occipital margin; eyes about as wide as long, their outer margin 

 oblique and slightly broadly emarginate, their upper exterior corners 

 passing slightly over on to the occipital surface ; vertex broad or as wide 

 as the whole head at the lower corners of the eyes; ocelli in a very obtuse 

 triangle, the posterior pair somewhat less removed from the eye-margins 

 than from each other. 



Fig. 2. Mandible of female Ootetrastichus fonnosanus. 



