232 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.41. 



ohliqua Fowler, 1899. Berkeley, California (H. 0. Wood worth). 



Name preoccupied; =obliquelia. 

 ohliquella Fowler, 1902. 



*ohlit€rata Cresson, 1863. District of Columbia. Tab. 1, 12. (Beminomada obliterata.) 

 obscura Fowler, 1899. Berkeley, California (Fowler). 



Name preoccupied; =obscurella. 

 obscurella Fowler, 1902. 



opposita Cresson, 1878. California (Henry Edwards). 

 orciisella Cockerell, 1910. Orcas Island, Washington (W. M. Mann). Subg. No'nada 



8. str. 

 *oregonica Cockerell, 1903. Corvallis, Oregon, April to June (Cordley). Tab 4, 6. 

 Ranges to S. California. Similar to N. sayi. 

 Paratype.— Cat. No. 13191, U.S.N.M. 

 ornithica Cockerell, 1906. Boulder, Colorado (W. P. Cockerell). Tab. 11. 

 *osborni Cockerell, 1911. Tucson, Arizona (H. Osborn). Subgen. Nomada a. str. 



Type.— Cat. No. 14025, U.S.N.M. 

 ovata Robertson, 1903. Illinois (Robertson). Tab. 9, 12. 

 ovata binotata Robertson, 1903. Illinois. Tab. 12. 

 ovata octomaculata Robertson, 1903. Illinois. Tab. 12. 

 ovata plena Robertson, 1903. Illinois. Tab. 12. 

 ovata quadrimaculata Robertson, 1903. Illinois. Tab. 12. 

 ovata sexmaculata HoBE-RTSON, 190S. Illinois. Tab. 12. 

 ovata imicolor Robertson, 1903. Illinois. Tab. 12. 

 pacata Cresson, 1878. Colorado (Ridings). 



Same as N. accepta. See Ann. Mag. Nat. Hist., Oct., 1903. p. 447. 

 packardiella Cockerell, 1906. Boulder, Colorado, June 11 (W. P. Cockerell). Tab. 11. 



Allied to N. nigrodncta. 

 pallidella Cockerell, 1905. Montrose, Colorado (Gillette). Tab. 1, 2 

 parata Cresson, 1878. Colorado (Ridings). Tab. 1. 



Allied to N. libata, but tegulse polished, with a few scattered punctures (in libata 

 coarsely sculptured and opaque). 

 *parva Robertson, 1900. Illinois (Robertson). Tab. 12. 



Confused with N. sayi; female abdomen 8-spotted. 

 *pascoensis Cockerell, 1903. Pasco, Washington State, May 25 (Kincaid). Tab. 4, 5. 

 A variety occurs in Los Angeles County, California. 

 Type.— Cat. No. 13187, U.S.N.M. 

 *pecosmsis Cockerell, 1903. Pecos, New Mexico, June26 (W. P. Cockerell). Tab. 1, 5. 

 Described as a. variety of N. xanthophila. 

 Type.— Cat. No. 13185, U.S.N.M. 

 pennigera Cockerell, 1894. Mesilla Valley, New Mexico. Tab. 1. 

 *perbella Viereck, 1905. Corvallis, Oregon (Cordley). Subg. Gnathias. 

 Closely related to N. bella. Also in British Columbia. 

 Paratype.— Cat. No. 13330, U.S.N.M. 

 perivincta Cockerell, 1905. Colorado. Tab. 1. 

 *perivincta Cockerell, var. B. Cockerell, 1911. Colorado. 

 perivincta semirufula Cockerell, 1905. Colorado. Tab. 1. 



*perplexa Cresson, 1863. "Mass., Conn., Pa., Del." Tab. 9. Subgenus Gnathias. 

 perplexans Cockerell, 1910. Pullman, Washington (W. M. Mann), Subg. Gnathias. 

 physura Cockerell, 1903. Nevada. Tab. 9. 

 *pilosxda Cresson, 1878. New York. 

 Belongs to the genus Viereckella. 



Plummers Island, Maryland, July 5, 1909 (J. C. Crawford). 

 *placida Cresson, 1863. Pennsylvania. Tab. 12. 



*placitensis Cockerell, 1903. Placita, New Mexico, May (Cockerell). Tab. 1. 

 Female about 10 mm. 

 Type.— Cat. No. 13176, U.S.N.M. 



