24 STNTOMIDJi;. 



Ir'. Abdomen without lateral tufts on last segment. 

 a*. Abdomen constricted near base. 

 «'. Fore wing with vein 7 given off nearer the 

 apex than 9. 

 a". Fore wing with vein 4 curved and approxi- 

 mated to 5 for some distance ; abdomen 



gradually expanding after the peduncle... Pseudosphex, p. 154. 

 b^. Fore wing with vein 4 not approximated 

 to 5 ; abdomen suddenly expanding after 



the peduncle Bo.mbopsyciie, p.l61. 



5'. Fore wing with vein 7 from 8 before 9. 

 a^. Abdomen with slender peduncle. 

 a^. Abdomen gradually expanding after the 



peduncle Sphecosoma, p. 157. 



f. Abdomen suddenly expanding after the 



peduncle, then tapering to apex Pompiliopsis, p. 161. 



b^. Abdomen slightly constricted at 2iid seg- 

 ment POJIPILIODES, p. 162. 



h^. Abdomen not constricted near base, 

 a'. Antennoe with the shaft dilated just before 



extremity Euno.mia, p. 200. 



6'. Antennffi with the medial part of shaft 

 dilated. 

 a^. Thorax clothed with woolly hair. 

 a'. Hind wing with the lower part of cell 

 very short, veins 2 and 4 on a long 



stalk HoMCEocERA, p. 165. 



b''. Hiud wing with the lower part of cell 

 long, veins 2 and 4 from angle. 



fl^. Palpi upturned Neotrichura, p. 169. 



b^. Palpi downcurved, extending about the 



length of head Xanthomis, p. 309. 



b^. Thorax smoothly scaled. 

 «''. Hind tibiae towards extremity and tarsi 



fringed with scales Macrocneme, p. 316. 



b''. Hind tibire and tarsi naked, 

 a*. Hind wing with the lower part of cell 

 very short, 

 a^. Antenna dilated from near base ; palpi 

 reaching above vertex of head ; abdo- 

 men and fore wing long Isanthrene, p. 170. 



b^, AntenniB dilated and serrate at middle ; 

 palpi not reaching vertex of head ; 



abdomen and fore wing short HYDA,p. 178. 



6*. Hind wing with the cell normal, veins 2 



and 4 shortly stalked or from angle. 



a^. Fore wing with vein 3 from angle of 



cell. 



a^°. Palpi with the 2nd joint reaching 



vertex of head ; antennse much 



dilated Dycladia, p. 292. 



b"^". Palpi not reaching vertex of head ; 



antennte shghtly dilated Euciiromia, p. 293. 



b^. Fore wing with vein 3 from well before 

 angle of cell, 

 ft". Abdomen stout ; fore wing broad, 



vein 11 from cell Bombiliodes, p. 179. 



b^". Abdomen more slender ; fore wing 

 long and narrow, vein 11 usually 

 stalked with 7, 8, 9, 10 Symomeida, p. 305. 



