29 



Secondaries creamish white with a shade of light brown cast over it. Light- 

 est near base and at anal angle. 



Expanse of wings. 30 mm. 



Length of body, 10 mm. 



Type Loc. S. W. Arizona (Morrison). 



2 males. Types Coll. B. Neumoegen. 



Named for Manfred Neumoegen. 



This insect is much smaller than //. Bertholdi or //. Flciirici and can he at 

 once recognized by its plain color." 



Early stages unknown. Hab., Arizona. 

 In Coll. Barnes, i $ from Wilgiis, Arizona. 



Genus Acossus Dyar. (Type undosus Lintner.) 



Cossus Walker, Cat. Lep. Het. Brit. Mus., VIl, p. 1515 (partim) (1856); Neu- 

 moegen & Dyar, Jour. N. Y. Ent. Soc, II, p. 161 (partim) (1804). 

 Tryf'aiius Kirby, Cat. Lep. Het., I, p. 860 (partim), (1892). 

 Acossus Dyar, Proc. U. S. Nat. Mus., XXIX, p. 178. 



Antennae of male bipectinate to tip ; palpi upturned, closely appressed to 

 front; vestiture of thorax largely composed of flat scales; abdomen hairy; pos- 

 terior tibiae w ith two pairs of prominent spurs ; sexes similar ; primaries broad, 

 vein Ri from middle of cell, Ri from apex of areole ; Ri and R« stalked, Ra from a 

 point with Ri or slightly stalked; Mi from lower angle of areole, Mj continuous 

 with lower margin of "ccllida intrusa," Ma close to M-j, 1st and 2n(l anal veins 

 free ; secondaries ; vein R strongly angled before end of cell with oblique sub- 

 costal cross vein almost always present. Mi stalked or from a point with R, Mj 

 and Ma from apex of "cellula intrusa" Cui from lower angle of cell. "Cellula 

 intrusa" present on both wings ; frenulum rudimentary. 



We have examined the type of Cossus and consider Dr. Dyar is 

 correct in placing our N. American species under a separate genus. In 

 Cossus the antennae of both sexes are lamellate, and there is no sub- 

 costal cross-vein on secondaries. 



Considerable confusion exi.sts regarding the species of this genus, 

 and we are not at all certain of our ability to clear up the doubt ; the 

 types are so scattered that it has been impossible to examine them all 

 per.sonally and we have been compelled to rely on figures and photo- 

 graphs. Under these circumstances we consider it advisable to treat 

 most of the described species as good species until further informa- 

 tion is forthcoming, rather than run the risk of wrongly sinking them 

 in the synonomy. The type localities are in most instances so widely 



