44 BULLETIN 15 7, V. S. NATIONAL MUSEUM 



Thanaos juvenalis was abundant, and the small spring form of 

 Papilio glaucus was common. The spring form of Pieris protodice 

 was seen for the first time, and Pieris rapae was noticed. 



On May 3 Thanaos jiwennlis was abundant, T. horatius was fre- 

 quent, and T. hrizo was fairly common ; Incisalia augustinus and /. 

 niphon were rather common, and /. henrici was taken for the first 

 time. Anthocharis genutia was common, five individuals of Pieris 

 protodice were seen, and a single Strymon melinus was caught. 



On May 9 Pholisora catullus, Everes comyntas^ Ghrysopham/as 

 phlaeas hypophlaeas, Phycoides tharos^ and Thanaos icelus were 

 found, and the first was common. Pyrameis atalanta and P. vir- 

 giniensis were seen for the first time this year, and the first was 

 rather common. Incisalia augustinus^ I. niphon^ and /. henrici were 

 taken, as well as Thanaos juvenalis^ T. horatius, Pieris protodice, and 

 P. rapae. Anthocharis genutia had disappeared. On the same day 

 a visit was made to Great Falls, where about a small lilac there were 

 observed, all at the same time, males and both yellow and black 

 females of Papilio glaucus, both sexes of the dwarf spring form of 

 Papilio philenor, a small male of P. troilu^, a late-spring male of 

 P. marcellus, and an example of Epargyreus tityrus. 



May 17 was cloudy, and few butterflies were seen. Worn indi- 

 viduals of Pyrameis mrginiensis and both worn and fresh examples 

 of P. atalanta were frequent. A single male oi Papilio polyxenes 

 was observed. Small numbers of Ghrysophanus phlaeas hypophlaeas, 

 Phyciodes tharos (late-spring form), and Everes comyntas, and 

 several dilapidated individuals of Thanaos juvenalis and of T. hrizo 

 were taken. Later at Cabin John a single female Colias philodice 

 (early-spring form), the first noticed this year, was seen. 



May 24 was cool and cloudy, and the only butterflies observed 

 were a number of worn Pyrameis virginiensis, one or two P. ata- 

 lanta, and several Pholisora catuUus, Everes comyntas, Pieris 

 rapae, Papilio glaucus (males), and P. troilus. 



On May 30 and 31 Pyrameis atalanta was not seen, but worn P. 

 virginiensis were very common, at least two dozen being met with. 

 They were exceedingly active and very shy. Pieris protodice and 

 Papilio polyxenes were very common, Pholisora catullus was com- 

 mon, and PieHs rapae, Papilio glaucus, P. troilus, and a single very 

 small male Colias philodice were seen. No hairstreaks were to be 

 found, and no skippers except for the one mentioned. 



It is difficult to compare the records for the spring of 1931 with 

 those for the springs of other years, for the reason that most of the 

 observations were made in a different region where few improve- 

 ments have been undertaken and where butterflies are therefore 

 more numerous. 



