212 THE CANADIAN ENTOMOLOGIST. 



34. Costa of primaries not depressed before apex 35. 



Costa of primaries depressed before apex Rhyparia. 



35. Wings opaque Spi/osoma. 



Wings somewhat translucent Thygorina. 



36. Front narrowed above and below Arctifiia. 



Front square, not narrowed 37. 



37. Rough hairy, wings subdiaphanous Eucharia. 



Somewhat smooth, wings opaque Hyphoraia. 



38. Accessory cell wanting 39 



Accessory cell present 40. 



39. Wings broad, size large, vestiture smooth and short. . . . Platyp7-epia. 



Wings moderate, size smaller, vestiture rough Eiiprepia. 



Wings elongate, size very small Kodiosoma. 



40. Spurs of posterior tibiae long or moderate 4T. 



Spurs of posterior tibiae short Ectypia. 



Median spurs of posterior tibise wanting Ammobiota^ 



41. Size small, body rather slender 42. 



Size large, body more robust 43. 



42. Wings short and broad Parasemia. 



Wings long and narrow Fygocttiuc/ia. 



43. Wings broad Arctia. 



Wings narrow Aiitarctia. 



44. Vein 8 of secondaries absent 52, 



Vein 8 present 45. 



45. Veins 7 to 10 of primaries stalked Cycnia. 



Vein 10 from the discal cell 46. 



46. Accessory cell present 47. 



Accessory cell absent 48. 



47. Antennae long, secondaries proportionately small Theages. 



Antennae shorter, secondaries larger Pygardia. 



48. Primaries broad, secondaries proportionate Euchcctes. 



Primaries narrow, produced at apex, secondaries smaller 49. 



49. Male antennas simple Pelochyta. 



Male antennae pectinate 50. 



50. Vein 8 of secondaries double Schausia. 



Vein 8 long, single Halisidota. 



Vein 8 very short, spurlike 51. 



51. Vein 5 of secondaries present Aemilia. 



Vein 5 of secondaries wanting Eupseudosotna, 



