6 Mr. R. E. Turner on 



Basal joint of fore tarsus with four spines; 



leiigtli 11 mm 36. 



86. Vertex with distinct and rather sparse 



punctures-, eighth sternite hroad .... T. instabiUs, Turn. 

 Vertex almo-t smooth, the punctures 



juicroscopic ; eighth sternite very 



narrow , T. disputaOilis, Turn. 



22- 



1. Mandibles not excised on the outer 



margin ; median segment striated on 

 the dorsal surlace, subreclaugnh^r, the 

 apical angles not roimded; abdomen 



M holly light ferruginous red Subgenus Hohitachyies. 



Mandibles deeply excised on the outer [_T. divhroa, Sm. 

 margin ; median segment never 

 striated on the dorsal suvface, rounded 

 at the apical angles ; abdomen other- 

 wise coloured 2. 



2. Maxillary palpi live-jointed ; labial 



palpi three-jointed, very long and 



slender ' Subgenus Calotachytes. 3. 



Maxillary palpi six-joiuted; labial palpi 



four-j' anted Subgenus Tachytes. 5. 



3. The four basal dor.-^nl segments der>sely 



clothed with brilliant silver pubes- 

 cence T. marshaUi, Turn. 



Dorsal surface of abdomen denseh' 

 clothed with brilliant golden pubes- 

 cence 4. 



4. Wings dark fiisco-hyaliue T. admirahilis, Turn. 



Wings subhyaline, with a pale fuscous 



apical margin T. miia, Kohl. 



5. Dort^al surface of abdomen densely 



clothed with bright golden pubes- 

 cence, head and thorax entirely with- 

 out golden pubescence ; with six 

 spines on basal joint of fore tar>i .... 6. 

 Abdomen not clothed with golden pubes- 

 cence, or if so clothed then with some 

 golden pubescence on the thojax 

 also, or with only five spines on basal 

 joint of fore tarsi 9. 



6. Clypeus with three distinct teeth on each 



side on the apical margin ; galea 



shorter than scape T. rhodesiana, Bisch. 



Clypeus without teeth ; galea much 

 longer than scape 7. 



7. Second sternite shining, with large 



scattered punctures T. velox, Sm. 



Second sternite subopaque, very minutely 

 and closely punctured 8. 



8. Abdomen and the greater part of the 



antennpe and legs dull ferruginous 



brown T. basilica, G ut^r. 



