OF WASHINGTON, VOLUME XI, 1909. 117 



SYNOPTIC TABLE OF GENERA OF SESIID.E. 



1. Hind wings with veins 3 and 4 stalked 2. 



Hind wings with veins 3 and 4 not stalked 10. 



2. Forewings with 11 veins ; one vein absent 3. 



Fore wings with 12 veins 4. 



3. Fore wings with a costal vein (10) absent Alcathoe. 



Fore wings with a dorsal vein (4) absent Bembecia. 



4. Tongue rudimentary; fore wings with vein 7 to termen. . .Aegcrui. 

 Tongue developed; fore wings with vein 7 to costa or apex 5. 



5. Labial palpi nearly smooth; if rough beneath, then with short 



scales 6. 



. . Labial palpi hairy 8. 



6. Hind tibiae nearly smooth throughout Parharmonia. 



Hind tibiae not smooth throughout 7. 



7. Hind tibiae rough haired throughout Sannina. 



Hind tibiae tufted at the spurs, smooth between Sesia. 



8. Hind tibiae nearly smooth Podosesia. 



Hind tibiae rough haired 9. 



9. Labial palpi upturned, nearly reaching vertex Vespamima. 



Labial palpi short, porrected Palmia. 



10. Fore wings with veins 7 and 8 coincident 11. 



Fore wings with veins 7 and 8 stalked 12. 



11. Tongue rudimentary Parathrene. 



Tongue developed Calasesia. 



12. Hind wings with vein 3 closely approximate to 4 13. 



Hind wings with vein 3 approximate to 2 Melittia. 



13. Tongue rudimentary 14. 



Tongue developed Memythris. 



14. Head and thorax long-haired Euhagena. 



Head and thorax smooth Gaea. 



I am unable to separate Sanninoida Beutenmiiller from 

 Sesia Fabricius ( Beutenmiiller ), and Albuna Hy. Edwards 

 from Memythris Newman. The characters which in the micro- 

 lepidoptera are recognized as generic are identical in these two 

 pairs of genera relatively, and even the secondary sexual char- 

 acters, the anal tufts, relied upon by Beutenmiiller, are not 

 tenable and seem mere questions of degree. 



The natural sequence of the genera would seem as follows, 

 placing those with the highest developed pterogostic characters 

 first: 



1. Bembesia Hiibner; type: hylceiformis Laspeyres. 



2. Alcathoe Hy. Edwards; type: caudata Harris. 



3. Aegeria Fabricius; type: apiformis Clerck. 



