62 BULLETIN 18, UNITEJJ STATES NATlU.XAL MU.SEUM. 



tip. The tibia is reduced to a huge process which covers a mass of 

 specialized scales, and a pencil of dark hair. The tarsi are long, very 

 weak, slender, and hardly functional. The wings vary somewhat in 

 width, being comparatively elongate, narrow and obtuse in T. mpnesalls^ 

 more trigonate, wider, and with a marked.ajiex in T.fforidana^ and with 

 an altogether broader, more ample, and frail api)earance in T. ixiUigera. 

 In the latter species the outer margin is somewhat inarked at the niiddh^, 

 when the fringes are defective. In all tlie species the accessory cell is 

 wanting and veins 7 to 10 are stalked, vein 10 arising very close to the 

 base of the stalk. It is altogether likely, though. none of my specimens 

 show it, tliat tlie accessory cell may be sometimes present. 



The three species referred to this genus are closely allied ami yet 

 very distinct. All the essential structural details are similar, and yet 

 in minor points they differ markedly. The ditference in wing form 

 between T. myxesalis and T. palligera is at hrst sight very great, but 

 si)ecimens of T. foridana are completely intermediate. In the struc- 

 ture of the male fore legs the species agree remarkably, in the struc- 

 ture of the male antenna' the agreement is only in the type. In 

 T. iny)ics((Iis the joints are I'ather even, cylindrical, not marked, fur- 

 nished with moderate, slender, lateral bristles, and with little tufts of 

 fine hair interiorly arising from small tubercles. The tuft is quite long 

 and marked. 



In T.fforidana the joints are much more robust and shorter, marked, 

 almost subserrate, with coarse scaly clothing. The lateral bristles are 

 hardly more prominent, but the tultings interiorly consist of decidedly 

 longer hair. 



In T. ludJ'njera the joints are yet more marked above the tuft which 

 in this species is much reduced; the scaly vestiture forms two elevated 

 rings on each joint and the lateral bristles.are much. reduced in length 

 and thickness. 



In color T. )iii/iie.s((Ii,s \» usually smoky to blackish over a somewhat 

 luteous base, wluch occasionally ap[)ears <]uite distinctly. 



T. Jioriihina is luteous, with smoky powderings which darken the 

 terminal portion of both wings. 



T.paUif/cra is paler, with brown powderings arranged nnich as in 

 the pi-eceding species, but frequently with a more yellow suffusion. 



In matndation the three species agree most remarkably, so a descrip- 

 tion of one will practically answer for all. 



ANALYSIS OF THE SPliCUCS OF TF:TAX0LITA. 



Color smoky to blackisli; male anteuiia ^vitll Joints not marked, lateral bristles 



moderate MYNESALIS. 



Color lute(ms; male auteiiiia with jomts subserrate, lateral bristles well marked, 



FLOHIOANA. 



Color luteous; male a-uteuua- with Joints serrate above the much-redured tuft, the 

 lateral l)ristles small palligera. 



