i63 



IV. The black bands and margins show no palpable difference. 

 Considering these statements, there exist no character belonging 

 exclusively to one of these two species, except that the females 

 possess always a very large fulvous spot on the internal angle of 

 the secondaries in P. tiirnus, but never observed in P. rutulus; 

 besides that of the first species, black aberrations of the female 

 occur frequently in the Southern and Middle States. 



The caterpillar of P. rutuhts is not yet known. The differ- 

 ences of the chrysalis from those of P. eurymcdon are given by 

 Mr. H. Edwards. Dr. Behr, 1. c, 1868, p. 300, says the caterpillar 

 of P. riitidiis lives on fruit trees. 



There is, I believe, no doubt that P. riitulus has to be con- 

 sidered as a Western form of P. titrniis as long as no other differ- 

 ences are known to exist. I am more in doubt or better not able 

 now to give a decided opinion about P. Dminus, as the material in 

 the museum is not sufficient. It consists of seven specimens in very 

 poor condition. The interior tail is broken. There were two large 

 males collected on the same place with P. riittilus and flying promis- 

 cuously, July 3, at Yakima City and one smaller, very poor, at 

 Spokane Falls, July 22. The large predominant yellow field with 

 narrow and widely-separated black lines is, indeed, very striking. 

 In the collection are three rubbed specimens collected together 

 with P. rutuhis by Mr. Garman, between Great Salt Lake and Ft. 

 Bridger, at 7000' about elevation. There were more than a 

 dozen, but merely fragments, not worthy of being preserved. 

 At the same time, July and August, and in the same place, 

 Mr. Garman collected P. eurymedon. One P. dainms from Ari- 

 zona is also before me. Of course, it is well-known that different 

 species live together at the same place and time, but in examining 

 nearer my specimens I am entirely at loss to find characters which 

 can be considered to be good ones to separate P. daiums from 

 P. rutulus. The internal tail of P. rutuhis is never longer than in 

 P. turuus ; say i to 2 mm. About the tail of P. daunus I can say 

 nothing, as it is wanting in all my specimens. All other differ- 

 ences consist in a larger or smaller development of the main color 

 and the pattern without decisive influence. PZntomologists with 

 a larger and more satisfactory material at hand will have to give 

 satisfactory characters to separate the two species. But I sup- 

 pose this will be a difficult task, if not an impossible one. I do 

 not know P. piluninus. 



I cannot speak with certainty about the relations of P. 

 euryjnedoii, as I have only five specimens from the Gulf of Georgia 

 in a somewhat tolerable condition before me. It may be only 

 stated that two specimens collected by Mr. Garman, together 

 with P. rutulus and P. daunus will be very difficult to separate 

 from P, eurymedon, and have been, indeed, united with this 

 species by experienced Lepidopterologists, who visited the 

 museum. Both specimens are in very bad condition. 



