73 



black edging to the rows of spots is very heavy and black spots are 

 usually visible in the submarginal orange row much as in palla. Occa- 

 sional specimens approach the typical form in maculation but the nor- 

 mal form in this region is the dark one which seems worthy of the 

 racial name we have proposed above ; our types are 6 S's and 4 9 's 

 from Crater Lake, Oregon, 6500 ft. (July 24-31). 



Melitaea flavula sp. nov. (PI. XI, Figs. 14, 15). 



We have had in the collection for a long time a series of a Melitaea 

 from the Rocky Mt. region which has perplexed us greatly to place 

 correctly and seemingly has caused others an equal amount of trouble 

 as it has come to us labelled acastus, palla and even gabbi; from the 

 typical form of all these species it differs and would seem to be inter- 

 mediate between acastus and palla, approaching very close to the Colo- 

 rado form of the latter species. Acastus (PI. XI, Fig. 13) is a large 

 species, rather pale orange-brown on the upper side and especially 

 characterized by the pale creamy, almost white banding on the under- 

 side of secondaries with a light leathery-brown basal area and heavy 

 black border lines; typical palla from California is deep reddish-brown 

 on the upper side, intermingled with a considerable amount of black ; 

 on the underside the secondaries have the banding very pale yellow 

 with very deep leathery brown basal area and rather heavy black 

 bordering lines; we have Colorado specimens from the vicinity of 

 Denver and Manitou which match up very well with Californian speci- 

 mens; Wright's figures of these two species (Butt. W. Coast, PI. XIX, 

 Figs. 175, 176) show the distinctions fairly well although the color 

 has not been very accurately reproduced. 



Our new form is rather smaller in wing expanse than either of 

 the allied species, averaging 35 mm. ; in the color and maculation of 

 the upper side it is almost the exact counterpart of acastus with pos- 

 sibly a slightly greater amount of black in the marginal area; the 

 underside of the secondaries is (as is usual in the group) the most 

 characteristic portion, the pale banding being a very decided yellow, 

 slightly deeper than in palla, whilst the leathery brown basal and term- 

 inal area is much paler than we find in the nimotypical Californian 

 form ; combined with this is the very fine nature of the black bordering 

 lines, especially those of the broad median yellow band ; the orange 

 band of spots preceding the large yellow marginal lunules is rather 

 reduced, leaving considerable of the yellow color visible, being in this 



