SYNTOJIID^. 21 



A few other genera of Arcfiadce, AutomoUs and its allies, appear 

 to sometimes have vein 8 of the hind wing absent, but this is really 

 due to veins 6, 7 being coincident and 8 stalked with them or from 

 angle of cell, all the gradations of this form being traceable ; these 

 can be distinguished by the coincident veins 6, 7 being given off 

 from the upper angle of cell with a slight upward turn, whilst 

 vein G when separate is given off with a downward turn. 



The most generalized genus in the family, and most nearly allied 

 to the Arctiadce, is probably Hi/nleucerea, with the palpi upturned, 

 fore wing with veins 4, 5, and 10 from the cell ; hind wing with 

 vein 8 rudimentary, vein 7 present, 5 from near angle of cell, and 

 2 from well before angle. From this have developed, among N^ow- 

 "World forms : — 



(1) Genera with rostriform palpi, such as Scej^sls : a group with 



vein 5 of hind wing stalked with 4, such as Eaagva, or with 

 veins 4, 5 of fore wing stalked, such as Lymire ; a group 

 with lateral tufts on the abdomen, such as Didasi/s, with 

 tufts of scales on medial part of antennne as in Dhiia, or 

 with the 2nd segment of abdomen constricted as in 

 Trichura ; forms with vein 4 of hind wing absent as in 

 Sesiura, or both 3 and 4 absent as Desmidocaemis, or vein 4 

 of fore wing absent as Sijntriclmra. 



(2) Genera with vein 2 of hind wing from angle of cell, vein 5 



being present, such as Amycles. 



(3) A main division with vein 5 of hind wing obsolescent from 



middle of discocellulars, of which the most primitive is 

 Autocliloris with vein 2 from long before angle of cell, 

 whilst nearly all the genera have it from the angle, of 

 these Lx-ylasia has vein 3 stalked with 4, but nearly all 

 the others have it stalked or coincident with 2, Macro- 

 cneme and Ps^nuJomi/a having the hind tarsi tufted with 

 scales, Lo.vophlebia with vein 5 of fore wing from well above 

 angle of cell ; a group of genera being clothed with rough 

 hair, such as Sarosa ; another group with the medial part 

 of shaft of antennae thickened, such as Tsanthreiie and 

 Eachromia, which is the only Old-AVorld genus with 

 affinities to the Neotropical forms ; a group with the 2nd 

 segment of abdomen constricted and closely " mimicking " 

 Hymenoptera, such as Fseudospliex ; and a group with 

 tufts of scales on terminal segments of abdomen, such as 

 Mallodeta. 



(4) Among the Old- World forms which are developed from an 



Arctoid form low down in the family, Psmdapiconoma has 

 vein 7 of hind wing obsolescent from angle of cell, and 

 Hyala'thea has it on a long stalk with 6 ; all the other 

 genera have veins 6, 7 coincident, among which the 

 Dysauxes group have vein 4 of hind wing present, the 

 Syntomis group have it absent, and the Geryx group have 

 both 3 and 4 absent. 



Eyy upright, with the micropyle at the top. 



