Mr. R. E. Turner on Fossorial Ili/menoptera. 299 



XXXII. — Notes on Fossorial ITymenoptera. — XXI. On the 

 Australian Larrii)a3 of the Genus Tachytes. By iioWLAND 

 E. TuENEK, F.Z.S., F.E.S. 



Key to the Australian Species o/Tuchytcs. 



1. Abdomen wholly bright testaceous or 



ferruginous red 2. 



Abdouieu black, at most the apical margins 

 of the segments or the apical segment 

 brown or ferruginous 3. 



2. Abdouieu bright testaceous ; pubescence 



of thorax and median segment golden ; 



legs bright testaceous T. fonnosissimus, Turn. 



Abdomen ferruginous red ; pul>escence 

 white ; legs black, the tarsi more or less 

 ferruginous T. rubellus, Turn, 



3. Pubescence of the abdomen deep or pale 



golden 4. 



Pubescence of the abdomen silver, that on 

 the pygidial area sometimes golden .... C, 



4. Outer margin of the basal joint of the foi-e 



tarsus with five spines ; second joint of 

 the flagellum scarcely longer than the 



third T. ajrproximaius, Turn. 



Outer margin of the basal joint of the fore 

 tarsus with six spines ; second joint of 

 the flagellum distinctly longer than the 

 third 5. 



5. Legs almost entirely black ; median seg- 



ment nearly half as long again as the 



scutellum T. plutocratictis, Turn. 



Tibial, tarsi, and the apex at least of the 

 femora bright testaceous brown ; median 

 segment very little longer than the scu- 

 tellum T. relucens, Turn. 



6. Tibia?, tarsi, and sixth dorsal segment 



ferruginous T. mitis, Turn, 



Legs, except the apical tarsal joints, black; 

 sixth dorsal segment black 7. 



7. Pubescence of the pygidial area golden and 



dense 8. 



Pubescence of the pygidial area not golden, 

 either silver and dense or fusco-ferru- 

 ginous and very sparse 9. 



8. Pygidial area very broadly rounded at the 



apex, almost truncate ; basal joint of fore 

 tarsus with six spines on the outer margin. T. eestuans, Turn. 

 Pygidial area narrowly rounded at the apex, 

 almost triangular ; basal joint of fore 

 tarsus with five spines on the outer 

 margin T. futalis, Turn 



