64 HYMENOPTERA. 



on each side, tlie metathorax with a shallow depression on each 

 side; the apical segment bright ferruginous. 



Hab. Australia. 



Genus 6. TACHYPTERUS. 



Tachypterus, Guer. Voy. Coq. Zool. ii. 216 (1830). 

 Psamraatha, Shuck. Trans. Ent. Soc. ii. 68 (1837-40). 



1. Tachypterus fasciatus. 



Tachypterus fasciatus, Guer. Voy. Coq. Zool. ii. 217. 

 Westw. Arc. Ent. ii. 102. 



Hab. Australia (Kangaroo Island). 



2. Tachypterus chalybeus. 



Psammatha chalybea, Shuck. Trans. Ent. Soc. ii. 69. pi. 8. f. 1 J . 



IVestw. Arc. Ent. ii. 20. pi. 54. f . 5 J . 

 Tachypterus chalybseus, Westw. Arc. Ent. ii. 102. 



Hab. Australia (Sydney). 



3. Tachypterus crassicornis. Plate III. fig. 10,?. B.M. 



Male. Length 5 lines. — Black : the clypeus, the lower por- 

 tion of the inner orbits of the eyes, the scape in front, the man- 

 dibles, palpi, the anterior coxae and femora in front, and a line 

 on the mtermediate and posterior coxae and trochanters, yellow ; 

 the antennae incrassate, and about the length of the thorax. The 

 wings hyaline and iridescent, the nervures dark testaceous, the 

 stigma blackish ; the legs ferruginous ; the coxae, trochanters, 

 anterior and intermediate femora beneath, black ; the intermediate 

 and posterior tibiae serrated exteriorly, the calcaria pale testa- 

 ceous. Abdomen : the second, third, and extreme base of the 

 fourth segment ferruginous ; the abdomen covered with a short, 

 changeable, silky cinereous pubescence ; the head and thorax 

 with longer pubescence of the same colour. 



Hab. Australia. 



The red colouring on the abdomen is more or less obliterated 

 in different individuals ; sometimes only the posterior margins of 

 the segments are red or rufo-piceous. 



Genus 7- ONCORHINUS. 



Oncorhinus, Shuck. Grey's Journ. Exped. King George's Souncf. 

 Append, ii. 471. 



