60 HYMENOPTERA. 



coxae, the tegulae, a spot on the disk of the mesothorax, a sub- 

 quadrate one on the scutellum, the post-scutellum, and a central 

 and two lateral spots at the apex of the metathorax, yellow ; wings 

 subhyaline, nervures ferruginous. Abdomen : a subovate spot on 

 each side of the second segment ; a transverse line in the middle 

 of the three following segments, interrupted in the middle, each 

 line in succession narrower than the preceding. 



Hob. Australia ? 



Genus 5. RHAGIGASTER. 



Thynnus, pt., Fabr. Syst. Ent. 360 (1804). 

 Bethylus, pt., Fabr. Syst. Piez. 238 (1804). 

 Diamma, Guer. Voy. de VAstr. 235. 

 Rhagigaster, Guer. Voy. Coq. Zool. ii. 214 (1830). 

 Thynnus, pt., King, Berl. Abhandl. 23 (1842). 



L RHAGIGASTER INTEGER. 



Thynnus integer, Fabr. Syst. Ent. p. 360. 3 <J ; Ent. Syst. ii. 

 245. 4 ; Syst. Piez. p. 231. 4. 



Donov. Epit. Ins. New Roll., PL Hym. Dipt. fig. V. 



Kirby, Mon. Ap. Angl. i. 223. 



Guer. Voy. Coq. Zool. ii. 229. 

 Rhagigaster integer, Westw. Arc. Ent. ii. 105. 6. 



Hab. Australia. 



This insect, which is unique in the Banksian Collection, has a 

 very close general resemblance to a species of Ccelioxys ; but it is 

 a true Thynnideous insect, belonging to the genus Rhagigaster. 

 Fabricius describes it as follows : " Antennae nigrse. Caput 

 nigrum, fronte tomento cinereo pubescente. Thorax ater, im- 

 raaculatus, scutello truncato, obtuso. Abdomen cylindricum, 

 segmentis in medio atris, margine omni villoso cinereo. Anus 

 integer, aculeo brevi, recurvo." The following particulars, ob- 

 tained by an examination of the typical specimen, may be 

 useful : 



Male. Length 6 lines. Shining black : the face clothed with 

 dense, long, pale yellowish pubescence ; a transverse ridge on 

 the front, and a horseshoe-shaped fovea above it, in which is 

 placed a single ocellus ; the clypeus deeply notched in front ; 

 the vertex with distant yellow punctures. The prothorax with 

 its anterior margin raised, and covered with transverse striae ; 

 the mesothorax with a longitudinal ridge on each side ; the scu- 

 tellum highly polished and truncate behind ; the metathorax is 

 depressed, rugose, and truncate behind ; the wings hyaline, the 



