DESCRIPTION OP THE SPECIES. 241 



very much faded. The description which Mr. Walker gives of 

 his Trypeta cornigera refers, if I understand it right, to this 

 variety. [The male specimen from Sharon was caught on the 

 same spot with the female ; I possess, moreover, a couple from 

 Connecticut, stuck on one pin, as if caught in copula. Thus 

 there can hardly be a doubt as to the sexes belonging together, 

 the very different picture notwithstanding. 0. S.] 



4. Varietas vittigera, % 9 . — Of the four lateral bristles of the 

 front, the two upper ones are very much incrassated and truncate 

 at the end. The thoracic dorsum shows, besides the anterior 

 end of the middle stripe, two well-marked black lateral stripes of 

 a moderate breadth, abbreviated in front, rather broadly inter- 

 rupted at the transverse suture and pointed posteriorly. Scu- 

 tellum, upon each lateral corner, with a black spot ; metathorax 

 on each side with a deep black longitudinal spot. Wings of the 

 male somewhat less elongated than in the male of the var. per- 

 fecta. The picture of the wings in both sexes is complete, hardly 

 different from that of var. perfecta. Of this variety I possess 

 only a male and a female from Nebraska (Dr. Heyden). 



5. Varietas intermedia % . — Of the four lateral bristles of the 

 front, the two superior ones, although strong, are not incras- 

 sated and not truncate at the tip, but end, as usual, in a point. 

 Thorax without black lateral stripes ; scutellum upon each lateral 

 corner with a black spot; metathorax on each side with a deep 

 black longitudinal spot. Wings of the male less elongated, and 

 perceptibly less pointed than in the first two varieties ; the 

 picture of the wings rather intense in coloring, the design 

 resembling that of the female of the first variety ; however, the 

 hyaline band passing between the two crossveins is rather con- 

 spicuously expanded at its posterior end. The last joint of all 

 the feet is rather conspicuously infuscated on the sides and at 

 its end. Of this variety I possess only a single male, without 

 indication of the precise locality. 



6. Varietas confluens, % . — Of the four lateral bristles of the 

 front the two upper ones are rather strong, but not incrassated 

 and not truncate at the tip, but end, as usual, in a point. The 

 thoracic dorsum, besides the anterior end of the middle stripe, 

 shows two well-defined black lateral stripes of a moderate breadth, 

 which are abbreviated anteriorly, rather broadly interrupted at 

 the transverse suture, and pointed posteriorly. Scutellum upon 



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