NORTH AMERICAN LKPIDOFTERA. 337 



row, even, crossing between tlie ordinary spots. Secondaries whitish basally, 

 with a rather well defined outer blackish margin, an indistinct discal Innule and 

 a faint extra discal line. Beneath, primaries smoky, secondaries much as above, 

 the discal lunula and extra discal line better marked. Thorax with collar smoky 

 or blackish, as is also the very distinct posterior tuft. Expands 1.12 inches; 

 28 mm 



Hob. — Texas, Canada, Illinois. 



A single male specimen is in the National Museum (Belfrage coll ) 

 easily known by the very even, distinctly geminate median lines and 

 the very prominently dentate s. t. line. 



The genitalia are nuich as usual ; the harpes are a trifle obliquely 

 rounded at tip, which is inwardly fringed with spinules. From the 

 middle of inferioi- margin arises the clasper, which narrows rather 

 abruptly from the inner side and extends beyond the harpe in a long, 

 acute and slightly curved spur. 



The species is somewhat aberrant in the very distinct basal tho- 

 racic tuft, but otherwise fully agrees with the characters of the genus. 



Mr. Grote's description of the species is somewhat diflferent, but I 

 can scarcely believe that it refers to another species. 1 have seen no 

 specimens named by Mr. Grote himself and I present his description 

 for comparison and as additional to my characterization. Should 

 the present species really prove different it might be called geminata. 



" Fore tibife with a terminal claw. Allied to Oncocnemis occata from Texas and 

 California. Differing as follows : Head and thorax black. Median space darker 

 than basal and terminal spaces, which latter are washed with white. Median 

 lines twice further apart inferiorly than in occata. Median lines even, not scal- 

 loped. Median shade black, not very diffuse. Ordinary spots larger ; orbicular 

 with an evident dark centre. The dentations of the s. t. line connected, followed 

 by a vivid white line. Fringes wholly black, not checkered as in occata. Hind 

 wings much as in occata ; a terminal, vague, broad, blackish baud, within which 

 is seen the median line; fringes white. Beneath less brown than in occata. 

 Expanse 28 mil." 



Hab. — Canada, Illinois. 



O. behrensii Grote, Bull. BufiF. Soc. N. Sci. 1874, ii, 65; Bull. Geog. and Geol. 

 Surv. iii, 116. 

 Head, thorax and primaries with an even, dull, deep ashen gray, over a yellow- 

 ish ground. Primaries with the ordinary maculation present, the lines fine and 

 hardly relieved. Basal line present, indistinct, geminate. T. a. line geminate, 

 upright, sinuate rather than lunulate. T. p. line geminate, outer line somewhat 

 diffuse and even, inner line slightly crenulate. Its course very much as usual, 

 exserted over the reniform. The median shade is indistinct, diffuse, darkening 

 the cell between the ordinary spots and then crossing the wing rather close to 

 and parallel with the t. p. line. Claviform large, slightly paler, not defined. 



TRANS. AM. ENT. SOC. XVI. (43) AUGUST, 1889. 



