SYXTOMID.i:. 21 



A few other genera of ArctiacUe, AiUomoUs and its allies, appear 

 to sometimes have vein 8 of the liind 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 C) when separate is given off with a downward turn. 



The most generalized genus in the family, and m')st nearly allied 

 to the Arctiad'P, is probably /fija/eac^reu, with the i)alpi 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 Xow- 

 World forms : — 



(1) Genera with rostriform palpi, such as Sc'psls ; a group with 



vein 5 of hind wing stalked with 4, such as Eaa;/ra, or with 

 veins 4, 5 of fore wing stalked, such as Li/mire ; a group 

 with lateral tufts on the abdomen, such as Dldasijs^ with 

 tufts of scales on medial part of anteniue as in D'uiia^ or 

 with the 2nd segment of abdomen constricted as in 

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

 Sesiwa, or both 3 and 4 absent as Desmidoctietnis, or vein 4 

 of fore wing absent as Si/ntrichunt. 



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



being present, such as Amijdes. 



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



middle of discocellulars, of which the most primitive is 

 Antochlorls with vein 2 from long before angle of cell, 

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

 these Lvi/hisia has vein 3 stalked with 4, but nearly jdl 

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

 ciieme and Pst'wlonuia having the hind tarsi tufted with 

 scales, Lo^vophlehia 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 antenna) thickened, such as Tsanthrene and 

 Encliromia, which is the only Old- World genus with 

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

 segment of abdomen constricted and closely " mimicking " 

 Hymenoptera, such as Pseudosphex ; and a group with 

 tufts of scales on terminal segments of abdomen, such as 

 Mallodeia. 



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



Arctoid form low down in the family, Pseiidapiconoma has 

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

 Hycdcethea has it on a long stalk with G ; all the other 

 genera have veins 6, 7 coincident, among which the 

 DysaiLves group have vein 4 of hind wing present, the 

 Syntomis group have it absent, and the Ceryx group have 

 both 3 and 4 absent. 



Egg upright, with the micropylc at the top. 



