JOHN B. SMITH, 8C. D. 351 



be justified. But with a series of both sexes for comparison, the 

 difference between the two species becomes obvious. Duscata is 

 uniformly smaller, more brown in ground, and more suffused with 

 blackish. The primaries are shorter, broader, and similar in the 

 sexes; the outer margin with not a trace of an. incurve below the 

 apex. In the primary characters of the male the difference is 

 emphasized. The harpes ai'e much longer and narrower than in 

 euroa, and at the tip there is a small series of spinules directed 

 inwardly. The clasper is shorter and stouter than in euroa, but yet 

 of good length and moderately curved. 



Ralla Grote and Robinson differs from the others of this series in 

 its rusty yellow color and general resemblance to ferrtLginoides. The 

 shorter, broader primaries and the punctiform s. t. line will differen- 

 tiate it at once, however, when the male characters cannot be referred 

 to. The uniform yellow secondaries give it a nearer appearance to 

 acta, which is of another faunal region. In the male structures this 

 species departs a little from the other species in this series by the 

 oblique fringe of spinules at the tip of the moderately elongate 

 harpes. The clasper is the same curved hook, but shorter, and on 

 the whole stouter in appearance. 



Inops Grote is altogether out of place here; but ray material is 

 too scant to work out its affinities at present. It resembles a small 

 ralla in color and wing form, but has the s. t. line continuous, pre- 

 ceded by a dusky shading, much more even than in the first series. 

 In the genitalia of the male it is different in all points from the 

 other species referred here. As to the uncus I cannot speak, because 

 I have had no material of my own available for dissection. In the 

 harpes we have a composite structure, the clasper being not really 

 separated from it. A horny plate runs through the lower half of 

 the harpes from basal third to the inferior angle at tip, and there 

 it is produced into an irregular serrate process. At about the 

 middle of this plate there is a small, cylindrical, obtusely terminated 

 spur. 



There are at least two other allied, undescribed species in collec- 

 tions, but in single specimens and in no condition to form satisfac- 

 tory types. 



As to the species here noted they may be arranged in tabular 

 form as follows : 



TRANS. AM. ENT. SOC. XXXIII. NOVEMBEE, 1907. 



