Sept., 1905.] Dyar : Hesperiid.e of the United States. 117 



Genus SCELOTHRIX Rambur. 

 Synopsis i if Spi cies. 



1. Size larger, expanse 22-28 mm 2. 



Size smaller, expanse 19-24 mm 3. 



2. Hind wings with faint white spots above centaureae. 



Hind wings with distinct white spots above caespitalis. 



3. Fringe of wings black spotted xanthus. 



Fringe white scriptura. 



S. centaureae Rambur. 



Inhabits the Atlantic States, though it is rare ; extends into the 

 Northwest ; I have a specimen from Ft. Providence, Mackenzie 

 (Preeble). 

 S. caespitalis Boisduval. 



Inhabits the Pacific coast from British Columbia to California. 

 S. xanthus Edwards. 



Described from southern Colorado and perhaps only a small form 

 of centaurecz as Mabille suggests. 

 S. scriptura Boisduval. 



From Arizona, New Mexico and California. 



Genus HELIOPETES Billberg. 

 Synopsis of Species. 



1. Fore wings white with black apical shading 2 



Fore wings with outer black checkered border 3 



2. Under side of hind wings with two brown patches at right angles laviana 



With these patches subparallel macair-a 



3. Fore wings spotted with white on the median area 5 



Fore wings with the median area more or less broadly white 4 



4. Black submarginal band of hind wings obsolete or dentate ericetorum 



Black submarginal band broad, nearly straight domicella 



5. Hind wings with distinct markings below syrichtus 



Hind wings with the marks nearly obsolete, white philetas 



H. laviana Hewitson. 



Reported from our southern border. 

 H. macaira Reakirt. 



Reported from our southern border. 

 H. ericetorum Boisduval. 



Occurs in California, both in the plains and mountains. 

 H. domicella Erichson. 



Reported from our southern border. 

 H. syrichtus Fabricius. 



Reported from our southern border. Mabille includes this species 



