I 



64 HYMENOPTERA. 



on each side, the 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). 

 Psammatha, 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 $ . 



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

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



Hab. Australia (Sydney). 



3. Tachypterus crassicornis. Plate III. fig. 10 <j . 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 intermediate 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 Sound. 

 Append, ii. 471. 



