180 SPHEGID^. 



6*. Posterior femora simple. 



o". Ocelli three, complete, round. 

 a'. Base of 1st abdominal segment 



narrowed, subpetiolate .... Lyeoda, p. 208, 

 b'. Base of 1st abdominal segment 

 not narrowed, pseudosessile. 

 a'*. Margins of abdominal seg- 

 ments constricted Palari^s, p. 213. 



A-. Margins of abdominal seg- 

 ments not constricted. 

 a^. Ej-es with their inner 



margins arched out- [p. 212. 



wards Lianthrena, 



¥. Eyes with their inner 

 margins not arched, 

 straight, converging to- 

 wards the vertex .... Astata, p. 182. 

 b^. Ocelli more or less distorted and 

 incom plete. 

 a' . Pygidial area bare, not pu- 

 bescent. 

 a!^. Pronotum posteriorly on a 



level w4th mesonotum. . . Lakra^ p. 195. 

 b*. Pronotum depressed beneath [p. 192, 



the level of mesonotum . . Tachysphex, 

 b'. Pygidial area pubescent. 



a*. Median segment much longer [p. 201. 



than mesonotum Notogonia, 



¥. Median segment equal in 

 length to mesonotum, or 



shorter Tachytes, p. 185. 



6*. Fore wing with two cubital cells . . Gastrosericts, 

 ¥. Mandibles not incised on their outer [p. 216. 



margins. 



rt*. Pygidial area pubescent Liris, p. 205. 



&'. Pygidial area not pubescent Paraliris, p.208. 



b' . Radial cell of fore wing not appendiculate. 



a^. Fore wing with two cubital cells. [p. 215. 



a^. Inner orbits not emarginate Miscophus, 



b^. Inner orbits emarginate. 



a*. Outer nervures of 2nd (prop. 3rd) 



cubital cell distinct PisON pt., p. 217. 



¥. Outer nervures of 2nd cubital cell so 



fine as only to be made out with [p. 222. 



some difficulty Trypoxylon, 



6^. Fore wing with three cubital cells. 



a^. Inner orbits emarginate PisON pt., p. 217. 



6^. Inner orbits not emarginate. 



a*. Median segment long, flat above, with 

 several longitudinal carin;e. 

 a\ Median segment above not broad- [p. 259. 



ened laterally ; colour black .... Dolichurus, 

 6'. INIedian segment above broadened 

 out laterally ; colour deep caerulean 

 blue ..,.." Trirogma, p. 260. 



