234 NORTH AMERICAN TRYPETINA. 



dark band, runs from the costa over the middle of the penultimate 

 section of the fourth vein, as far as the middle breadth of the 

 discal cell. The first hyaline spot of the posterior margin begins 

 at the end of the last longitudinal vein and reaches as far as the 

 fourth vein; the second and third spots begin, as usual in the 

 species with this kind of picture, at the posterior end of the 

 second posterior cell ; both are very pointed at their end, and 

 while the second spot reaches only to the fourth vein, the third 

 goes as far as the third vein. Besides these hyaline spots, there 

 is, at the basis, a small hyaline mark, connected with the whitish 

 tegulae ; in the anal angle of the wing, near the margin, there is a 

 diluted dot. The last of the dark bands is separated from the 

 costa, as far as the third vein, by a narrow, hyaline border ; the 

 small crossvein has a similar, very narrow, hyaline border. A 

 peculiar mark of this species is, that the spot at which the second 

 and third longitudinal veins diverge, forms a knot-shaped, blood- 

 red swelling, like a drop of coagulated blood; the first longitu- 

 dinal vein, near its basis, likewise shows a more or less distinct 

 blood-red coloring. 



Hab. Massachusetts (Mr. Sanborn). 



Observation. — Trypeta vulnerata cannot be well located in 

 any of the genera hitherto formed out of the old genus Trypeta. 

 The great resemblance of the picture of its wings to that of 

 Acidia lychnidis Fab. (= discoidea Meig.), naturally suggests 

 its location in the same genus. A closer examination, however, 

 proves that, although its relationship to the species of that genus 

 is rather close, it differs very much in the structure of the head, 

 the very much more swollen scutellum, the structure of the ovi- 

 positor, some details in the venation, and the almost stubble- 

 shaped pile. Thus we are compelled to establish a separate genus, 

 Stenopa, for it, which finds its place next to Acidia. 



8. T. fratria Lw. $. (Tab. X, f. 4.)— Lutea, corpore brevi et lati- 

 usculo, scutello setas quatuor gerente ; alse rivulis luteo-fuscanis, raacu- 

 lara ovatam hyalinam in apicali cellulae discoidalis parte sitam inolu- 

 dentibus, apice vena? longitudinalis quartae non recurvo. 



Clay-yellow, stature sbort and somewhat broad, with four bristles on the 

 scutellum ; wings with yellowish-brown rivulets, which inclose an oval, 

 hyaline spot before the end of the discal cell; the end of the fourth 

 longitudinal vein is not curved forwards. Long. corp. 0.22; long. al. 

 0.22. 



