198 REVISION OF THE THYNNID^E OF AUSTRALIA, II., 



subrectangular, a little broader than long. Thorax and median 

 segment sparsely punctured; median segment almost vertically 

 truncate posteriorly. First and second abdominal segments with 

 the apical margin raised, and covered with many low and more 

 or less irregular transverse carina?; the three following segments 

 with scattered punctures. Fifth ventral segment longitudinally 

 striated. Pygidium vertically truncate posteriorly, with a few 

 curved carina? above and on the base of the truncation, surface 

 of the truncation broadly oval, subtruncate at apex. Inter- 

 mediate tibiae very much dilated. Entirely black; legs and 

 antennas fuscous. 



Hah. — Australia(Smith); N.W. Coast(British Museum). 



Nearest to T. novarce Sauss., but the pygidium in the present 

 species is not sharply contracted before the truncation, on which 

 account I place it in this group, but consider that it may very 

 likely belong to one of the species of Thynnus proper. 



Subgenus Thynnus. 



Thynnus Fab., Syst. Ent. p.360, n.113, 1775. 



Myrmecodes Latr., Gen. Crust, et Insect, iv. p. 11 8, n.521, 1809* 



Thynnoides Guer., Voy. Coq. Zool. ii. 2, p.214, 1830(1839). 



Zaspilothynnus Ashm., Canad. Ent. xxxv. 1903. 



Thynnides Ashm., I.e. 



Thy nnidea Ashm., I.e. 



Tachynomyia Ashm., l.c.(nec Guer.). 



Guerinius Ashm., Lc. 



Homalothynnus Enderlein, Zool. Anzeiger, xxvii. p. 46 6, 1904. 



g. Labium broad and full, rounded at sides and very slightly 

 narrowed at base. Joints of maxillary palpi subequal; antenna? 

 of nearly even thickness throughout, not slender at apex. 

 Second recurrent nervure received at a considerable distance 

 from base of third cubital cell. 



£. Pygidium more or less sharply contracted at base of poste- 

 rior truncation or on the truncation. Maxillary palpi usually two- 

 jointed, but in Thynnoides fulvipes Guer., they are three-jointed. 



