242 NORTH AMERICAN TRYPETINA. 



each lateral corner with a black spot. Metathorax on each 

 side with a deep-black longitudinal spot. Wings of the male 

 comparatively less elongated, and less attenuated towards the 

 tip, consequently comparatively broader than in the first and 

 second variety. The picture of the wings is complete, its color- 

 ing uniform, not very saturate, seldom here and there with a 

 trace of darker margins ; the oblique hyaline crossband passing 

 between the crossveins is comparatively narrow, reaches, how- 

 ever, the anterior margin completely. The brownish-yellow 

 rivulet rising across the posterior crossvein is of a considerable 

 breadth in all its parts, so that the branch of it which borders the 

 margin of the wing and that which runs along the last section of 

 the fourth longitudinal vein, coalesce in their middle. 



I possess a single male only (Connecticut ; Mr. Norton) ; it is 

 one of the smallest specimens of this species in my collection. 



7. Varietas arculata %. — Of the four lateral bristles of the 

 front, the two upper ones are not stronger than usual among the 

 species of the same size ; as usual, also, they end in a point. The 

 thoracic dorsum shows, besides the anterior end of the middle 

 stripe, two strongly marked black lateral stripes of moderate 

 breadth, which are abbreviated anteriorly, rather broadly inter- 

 rupted at the transverse suture, and end in a point posteriorly j 

 scutellum with a black spot upon each lateral corner ; metathorax 

 on each side with a deep black longitudinal spot. The wings of 

 the male are less attenuated towards the apex than in the males 

 of the first aud second varieties, but comparatively less broad 

 than in the sixth variety. The picture of the wings has a rather 

 uniform yellowish-brown coloring. It differs from that of all the 

 other varieties in the fact that the oblique hyaline band, running 

 between the two crossveins, does not reach the anterior margin, 

 but suddenly ends between the second and the third longitudinal 

 veins, so that the border of the anterior margin is not at all inter- 

 rupted beyond the triangular hyaline spot near the stigma ; at 

 the same time, this hyaline band is connected with the hyaline 

 streak in the latter portion of the first posterior cell, the rivulet 

 crossing over the posterior crossvein being interrupted here. 

 These modifications give the picture a very different appearance. 



Of this variety I likewise possess but one specimen (Illinois ; 

 Mr. Brendel) ; it is but little larger than the male specimen of 

 the sixth variety. 



