CHARLES W. METZ. 149 



Habitat. — So far as known, Nevada and California. Cali- 

 fornia specimens taken in King's River Canyon at 7000-8000 

 feet (F. S. Bichowsky). 



Specimens examined: About 20. 



This species is peculiar in being evidently so nearly related 

 to P. polifolii and yet having such different male genitalia. 

 In some of the males are found traces of a supraclypeal mark 

 as small yellow blotches. Asin polifolii there is often more 

 or less black between the lateral and clypeal marks, and also 

 at apex of clypeus. The membranous flaps of the seventh 

 ventral plate do not always point out as shown in the figure, 

 but may point somewhat forward, giving a narrowed appear- 

 ance to the wings. All the males examined are readily 

 separated from those of P. polifolii by the short lateral face 

 marks, and the two females from King's River are separated 

 in the same way, but whether this will serve in a large series 

 from many localities is doubtful. The real diagnostic char- 

 acters are in the male genitalia which can be told at a glance. 

 No previous description of the female has been given, to my 

 knowledge. 



P. hesperiphila Ckll. described in 1910 from California 

 specimens is undoubtedly this species, if the description is 

 characteristic. It was based upon the characters of the 

 lateral face marks, which are, " truncate above, and strongly 

 notched by antennal sockets ". I have examined the type 

 of this and cannot distinguish it from California specimens 

 of nevadensis. 



UNCERTAIN SPECIES. 

 Prosopis aflfiiiis Sm. 1853. 

 1853. P. affinis, Sm. Cat. Hym. Brit. Mus. 1:24. 

 1910. P. affinis, (female), Lov. Psyche. 17:179. 



No one has yet been able to definitely identify specimens 

 in America as belonging to this species. That usually taken 

 for it has been P. zizice Rob., but Lovell has shown this to 

 be erroneous in his recent description of the type, (Psyche. 

 17 :179). He considered the two sexes described as affinis 

 to belong to different species, and calls that of the male " P. 

 bingluuni n. sp.". From the description and figures given, 



TRANS. AM. KNT. SOC. , XXXVII. (19*) 



