March, 1903] BUSCK : NOTES ON YPONOMEUTID.B. 45 



thorax closely punctate ; body smaller and more depressed than usual in this genus. 

 Length, 4.5 mm. -r .iS inch. 



I have not seen the type and the figure is drawn from a specimen 

 in my own collection from the same locality and seemingly identical 

 with the insect described by Major Casey. Mr. Blanchard has speci- 

 mens from New Mexico, collected by Prof. F. H. Snow in which the 

 subbasal band and median spot are connected. The elytra in one 

 specimen bear also a disconnected subapical spot. I regard these as 

 a form of dispar. 



NOTES ON THE CEROSTOMA GROUP OF YPO- 



NOMEUTID^, WITH DESCRIPTIONS OF 



NEW NORTH AMERICAN SPECIES. 



By August Busck. 



While endeavoring to arrange some American moths of the Ceros- 

 toma group and for that purpose examining critically the European 

 species placed in that genus by modern European authors, I was sur- 

 prised by the diversity of forms included under that generic name. 

 Meyrick, in his Handbook of British I, epidoptera, includes in Ccros- 

 toma all English Yponomeutidce which have veins 6 and 7 in the 

 hindwings stalked. This is at least more consistent than the course 

 pursued by Rebel in the Catalogue of European Lepidotera, where he 

 places one of them, jnucromella Scopoli, under a separate genus 

 Theristis, leaving the rest, which readily separate into four just as 

 distinct genera, in Cerostoma. The natural way seems to be to divide 

 the group into the five genera defined by Wallengren (Ent. Tids- 

 krift, I, p. 53, 1880), but some of his generic names will fall in favor 

 of Hiibner's earlier terms. 



The genus Cerostoma was founded by Latreille (Hist. Nat. des 

 Crust, et Ins., Vol. Ill, p. 416, 1802) and was characterized as fol- 

 lows : "Ailes tres-alongees, etroites, monies sur le corps. Quatre pal- 

 pes distinctes ; les superieurs droits, les inferieurs long et recourbes ; 

 leur second article penicilliforme, le derniere conique, alonge, presque 

 nu." 



The type of this genus is Ypsolophiis {Aliicita) dorsatus Fabri- 

 cius, that being the only species mentioned by Latreille both in this 

 volume and in Vol. XIII, p. 247, 1805. 



