86 TWENTY-THIRD REPORT ON THE STATE CABINET. [21 8 J 



ther would I take "Walker's chamomillce for intermedia. It is not 

 probable that a species, which seems to be as common in the northern 

 United States as umbratica is in Europe, should not be represented in 

 the British Museum ; and whether Walker is correct in his distinction 

 of the species is very questionable. Of lucifuga^ he mentions only a 

 single European specimen in the Museum. 



The following description is based on the comparison of 10 interme- 

 dia (4 & and 6 ? ) from New York, with 7 lucifuga (3 $ and 4 ? ) from 

 Austria, Bavaria, Switzerland, Silesia and Thiirmgen. 



Expanse about the same ; the anterior wings of the largest females 

 of both species expand 23 mm., of the smallest males of intermedia 

 20 mm., and of lucifuga 21 mm. As far as I can discover, the abdom- 

 inal construction is the same, as is also the sharp cut of the wings so 

 characteristic of this genus. Anterior wings sharp, posterior margin 

 oblique, slightly wavy and curved toward the interior angle. The 

 anterior angle of the secondaries obtuse, rounded ; posterior margin 

 slightly undulated, irregular and somewhat wavy. Color of anteriors 

 the same as in lactucce^ or a little darker and more inclined to blue, a 

 uniform bluish-gray, with slight shadings of light mold-gray, especially 

 in the interior margin and terminal region, the latter traversed by 

 lighter rays, but often very indistinct and variable. The last may be 

 said of the two zigzag lines, which are, however, formed precisely as 

 with lucifuga / of these the front line is almost always distinctly visi- 

 ble, and the hinder one only distinct near the interior margin. 

 Toward the anterior margin these lines become broader and macular, 

 and here, between the two, a third line is visible, darker and stronger 

 than either. The dorsal vein,* and those in the terminal region, 

 appear as very fine black lines. The black ray emerging from the base 

 is long and fine. The three rays in the terminal region the longer and 

 finer ray in cell no. 4f , which emerges from the outer margin of the 



[*The submedian of American entomologists.} 



[f Among the German entomologists, the nerves and nervules are designated by the 

 numbers 1, 2, 3, 4, etc., counting on the posterior margin from the posterior toward 

 the anterior angle of the wing. The first nervule of the median uniformly bears 

 the number 2. The submedian, the internal, and whatever interior nerves may 

 exist, are known as 1 a, 1 b, 1 c, enumerating from the internal margin. The nerve 

 opposite the discal cell, and usually given off from the cross-vein, is no. 5, and, for 

 the sake of uniformity, is so counted even when absent : no. 8 usually terminates 

 just below the apex of the wing. The cells (interspaces of Clemens and others) are 

 as follows : between the internal margin and nerve adjacent is 1 a ; if this nerve be 

 the internal, then the space between it and the submedian is 1 b, followed by 1 c ; 

 but when there is no internal nerve, then this latter cell becomes 1 b. Between the 

 nervules of the median and of the subcostal, the cells bear the numbers of the ner- 

 vules which precede them ; thus, between the first median nervule (no. 2) and the 

 second (no. 3), is cell no. 2 ; opposite the discal cell, separated by nerve 5, are cells 

 4 and 5, and thus, to cell 12 or 13, if the venation permit, on the basal portion of the 

 anterior margin.] 



