174 JOHN B. SMITH. 



Vashtl is nearest to albesceii-s, difTering from it principally in the 

 concolorous thorax, the patagiai only being heavily black edged. 



Libocedrus I have not examined closely enough to give details as 

 to differences. The thoracic markings are very much as in chersis, 

 except that in addition to the triangle outlining the patagise there is 

 also a line through the middle of each. 



ChersU has, on the thorax, a triangle, its apex towards the head. 

 The submarginal black streak is somewhat irregular and not followed 

 by a white shade. Oreodcqohne Edw., was based on a small specimen. 



Insolita is a small species, very much like vashtl in style of macu- 

 lation, but not near so distinct. The abdominal bands are beauti- 

 fully cream colored and the secondaries black at base. Very much 

 reseml)ling these others in markings and in the armature of the legs 

 is the next group, obviously differing from them in the immaculate 

 secondaries. 



Of these pinastri is the largest, and distinguished at once from all 

 others by usually having a distinct, single, basal, transverse band on 

 primaries, with a variable number of interspaceal dashes from this 

 band. Tlie lateral thoracic bands are straight and run through the 

 middle of the patagise instead of on the margin. Mr. Sti-ecker de- 

 scribed and figured the species as saniptri, and afterward stated it 

 was identical with pinastri. I have never seen a pinastri from the 

 United States, and I do not believe, judging from the figure, that Mr. 

 Strecker's species is identical with the European insect, yet I follow 

 his reference, since I do not know his species. 



Sequoidi has the wing form of pinaMri, but is smaller. It lacks all 

 trace of the transverse line of primaries and has a submarginal black 

 streak similar to that in vashti, chersis, etc. The patagite are black 

 margined, and there is also a black line through the middle. 



Very similar in maculation, but much smaller and paler is dollii 

 Neum. This is the smallest species of the genus expanding less than 

 two inches. 



Coloradus differs, obviously, from the others in having two broad 

 brown thoracic stripes margining the patagiai and extending nearly 

 to their middle. There is an oblique dusky shade band extending 

 from the inner margin near to base through the centre of the wing 

 to the apex, margined above by a pale gray shade. 



In all these species the palpi are short, the frontal vestiture is 

 loose and the head is not prominent. The spurs of the middle and 

 hind tibia3 are short. 



