HYMENOPTERA. 43 



118. THYNNUS COMPRESSUS. B.M. 



Female. Length 5 lines. Head bright castaneous, flattened, 

 smooth and shining ; thorax beneath, the legs, and second seg- 

 ment of the abdomen rufo-testaceous ; the disk of the thorax 

 obscure fusco-ferruginous ; the anterior margin transverse, with 

 the lateral angles acute ; the metathorax oblique, with a few deli- 

 cate punctures, the pro- and mesothorax with scattered punctures. 



Hah. Australia. 



119. THYNNUS SULCIFRONS. B.M. 



Female. Length 5 lines. Head ferruginous, flattened, widen- 

 ed and rounded behind the eyes, with a longitudinal excava- 

 tion on each side ; the mandibles simple, falcate, and acute at the 

 apex, the apex black ; thorax black, smooth and shining ; the 

 metathorax narrowed at the base, truncate behind. Abdomen 

 variegated with yellow bands ; the basal segment with an unin- 

 terrupted fascia, a spot on each side of the second, the third and 

 fourth with an interrupted fascia. 



Hab. Australia. 



120. THYNNUS MOLITOR. B.M. 



Female. Length 10 lines. Black, shining: front coarsely 

 punctured ; prothorax transverse in front and narrowed behind ; 

 metathorax obliquely truncate; base of the abdomen closely 

 punctured, the second segment transversely striated, the apical 

 one longitudinally so. 



Hab. S. Australia. 



(Probably the $ of T. Klugii.) 



121. THYNNUS DILATATUS. B.M. 



Female. Length 6 lines. Black, slightly shining : head 

 small ; anterior margin of the thorax slightly incurved ; meta- 

 thorax abruptly truncate; intermediate tibiae very broadly di- 

 lated ; the two basal segments of the abdomen transversely stri- 

 ated, the four following smooth and shining. 



Hab. Australia. 



122. THYNNUS ADUSTUS. B.M. 



Female. Length 6 lines. Dark reddish-brown above, be- 

 neath ferruginous ; closely punctured, the punctures confluent 

 on the head and thorax; the metathorax oblique; the legs, 

 antennae, and front of the head ferruginous. 



Hab. Australia. 



