182 THE CANADIAN ENTOMOLOGIST. 



markedly as eggs, caterpillars and chrysalids, that a schoolboy collector 

 could not fail to separate them properly. 



The Type. — This species was first described by Grote and Robinson 

 in 1867 (Trans. Am. Ent. Soc, I, 174), and the type specimen is now in 

 the collection of the American Museum of Natural History in New York 

 City. After a careful comparison with the butterflies in my own collection, 

 I have no hesitation in affirming that it is a ma/e,* although, the abdomen 

 having been lost, positive determination is impossible. 



An Error Corrected. — In his Catalogue of Butterflies (1878) Strecker 

 places Henrici as variety b of irus^ and adds: "Smaller. Inferiors 

 tailless." Since this characterization is altogether misleading, I have 

 thought it worth while to direct attention to the error. It is true that 

 averages made from a large number of specimens will show that Henrici 

 is a trifle the smaller, but many of the larger Henrici have a broader alar 

 expanse than the majority of irus, so the knowledge of averages is not of 

 much assistance to the collector. As for the statement that the second- 

 aries of Henrici are without tails, and the implication that tails are always 

 to be found in irus, I can only say that such is not the case. In this 

 respect irus is variable, occasional specimens (bred) appearing from 

 chrysalis, with merely a slight projection at the end of the nervule as in 

 niphon : again, though more rarely, the tails are ([uite [)ronounced. Fig. 

 3 (Plate 4) represents the outline oi irus wings usually met with ; fig. r is 

 the male and fig. 2 the female of Henrici, showing that well-developed 

 tails are present in b(jth sexes.")' Of this species no individuals with 

 tailless inferiors have come to my attention except where the tails have 

 obviously been lost. 



Time of Flight. — Species single-brooded, the butterflies appearing 

 with irus; i. e., at the very end of April. Never so abundant (here) as the 

 latter, and to be sought with greatest success in sunny spots in the open 

 pine woods, where Vaccinium vacillans is the dominant shrub of the 

 undergrowth, and around the edges of swamps where V. corymbosum is to 

 be found. Its season of greatest abundance and time of disappearance 



*My determinalion is based principally on the fact that the type is marked 

 with red-brown near the anal angle of the secondaries above, while the primaries 

 are not suffused. In my series of nearlj' 200 butterflies this combination is found 

 onlv in the males, the females showine;- more or less suffusion on all the wing-s, 

 and when this is reduced o\\ the |irimaries it is about equally reduced on the 

 secondaries, never remaining, as in the males, a rather conspicuous patch near 

 the angle. 



iThese figures, natural size, are from blue prints made directly from the 

 insects' wings. 



