240 NORTH AMERICAN TRYPETJNA. 



the margin of the wing ; the hyaline interval between it and the 

 branch bordering the anterior margin of the wing is, in the male, 

 comparatively longer and conspicuously narrower than in var. 

 perfect? ; the female shows the same difference, but very feebly. 



Wiedemann's description is based upon specimens of this 

 variety, which is a very common one. The other synonyms, 

 quoted above, likewise belong here, with the only exception of 

 Trypeta cornigera Walker. I possess of this variety four per- 

 fectly well-preserved specimens (a male and three females), caught 

 at the same time by Mr. Auxer in Lancaster City, Penn. ; the 

 three females have, at the posterior end of the two posterior 

 abdominal segments, longer, stronger, and somewhat more abun- 

 dant pile than the females of other varieties. 



3. Varietas longitudinalis 9. Of the four lateral bristles 

 of the front the two uppermost, in the male, are very much 

 incrassated and truncated at the end. Thorax without any black 

 lateral stripes ; scutellum on each lateral corner with a black 

 spot; metathorax without black picture. The wings of the male 

 comparatively narrower than in all the other varieties ; their 

 picture coalesces into a single broad longitudinal stripe, which, 

 from the root of the wing as far as nearly the end of the poste- 

 rior basal cells, has a dirty clay-yellowish coloring ; beyond this 

 point, it changes into dark-brownish. The interval between the 

 second and fourth longitudinal veins is completely filled by this 

 stripe, with the only exception of a small hyaline spot at the end 

 of the fourth longitudinal vein ; moreover, the stripe encroaches 

 a little beyond the second and fourth veins in the shape of little 

 wavy expansions. The picture of the female hardly differs from 

 that of var. typica; only the spot in the costal cell, between the 

 stigma and the humeral crossvein, which is usually wanting in 

 var. perfecta and present in var. typica, is much darker than in 

 the latter species ; this is also the case in the male. 



These statements are taken from a very fine pair of specimens 

 from Sharon Springs, N. Y., collected by Baron Osten-Sacken. 

 He sent me at the same time a male from Connecticut (collected 

 by Mr. Bassett), which agrees with the former in the picture and 

 in the shape of the wings, except that the uniformly brown part 

 of the picture of the specimen from Sharon is clouded with yel- 

 lowish-brown and dark-brown ; moreover, in the latter specimen, 

 the spot placed between the humeral crossvein and the stigma is 



