NORTH AMERICAN LEPIDOPTERA. 175 



The next group contains species in which the middle tibite are not 

 spinose, the fore tibia sparsely or not spinulose, while the fore tarsi 

 have the first and second joints outwardly armed with a rather 

 heavy claw-like spines. The primaries are comparatively somewhat 

 shorter and liroader, with less oblique margin than in the pi'evious 

 groups. The head is distinct, and except in eha, which is aberrant, 

 the palpi are well developed and reach well up the front. The spe- 

 cies seem more robust in build than the others. The maculation is 

 of the same type as the previous groups, but is much heavier and 

 the sjiecies have not, therefore, that uniform grayish appearance. 



Elsu is an aberrant and beautiful species. The palpi are smaller 

 than in the others of the group, and the spurs of the middle and 

 hind tibiae are small. It is the connecting link, structurally, between 

 the typical Sphinx and the Hyloicus structure. In color it is white, 

 with black powderings on primaries and with a more or less evident 

 suffusion of pale brick red, most distinct in the % . The secondaries 

 are white, with two black bands. 



Canadensis resembles in color and general appearance gordius, but 

 the dorsum of the thorax is not dark. The secondaries resemble 

 those of chersis, and it is possible it may belong with that group. I 

 have been unable to examine the structure of the legs personally, 

 though I have seen the species in Mr. Hill's collection. The trans- 

 verse lines of the primaries are very distinctly traceable, and it dif- 

 fers in that respect from the previous group. 



Lugens has the transverse lines of primaries very distinct, and 

 there is a double white discal spot. The secondaries are blackish 

 with narrow white bands. I consider Mr. Neumoegen's species, 

 separatus, as a color variety of this species, the typical form of which 

 has, so far as I am aware, never been found in the United States. 

 Walker describes it from Mexico. 



Eremiius resembles lugens very closely in appearance, but the 

 transverse lines are very indistinct, and the longitudinal streakings 

 heavier. The gemminate discal spot of primaries is the same, and 

 the maculation of secondaries is also identical. 



Plebeins differs obviously from all the species by the blackish 

 brown secondaries. The eyes are distinct and very feebly lashed, 

 and the palpi are well developed. The primaries are gray, with the 

 markings heavy ; no transverse maculation, and with a single white 

 discal spot. The spurs of the middle and hind tibiae are very long. 



Cupressi has also concolorous, but brown primaries. The abdomen 

 also is not banded, but has three longitudinal dusky lines. In 



