DESCRIPTION OF THE SPECIES. 253 



giotoma. The characters of this genus are as follows : In the 

 structure of the head and of its parts and of the scutellum it 

 resembles Acidia very much ; the scutellum, provided with four 

 bristles, is convex, without appearing swollen ; the shape of the 

 abdomen likewise reminds one of the species of Acidia; the ovi- 

 positor also has a similar structure, but is longer than in Acidia, 

 rather broadly truncate at the end. Wings rather large, with a dis- 

 tinctly convex anterior margin ; the first and third veins are dis- 

 tinctly bristly ; the crossveins are very much approximated ; their 

 posterior end is nearer to the apex of the wing than the anterior 

 one ; the last section of the fourth vein forms a bow, the convex 

 side of which is turned towards the anterior margin, so that it 

 distinctly diverges at the end from the end of the third vein, which 

 is much more straight; the posterior corner of the anal cell is 

 drawn out in an acute point. The picture of the wings consists 

 of four very oblique crossbands, the second of which runs over 

 both crossveins; the last crossband forms a border along the apex 

 of the wing. 



IS. T. palposa Lw. %. (Tab. X, f. 9.) — Lutea, abdomine puncto- 

 runi nigroruin seriebus quatuor picto ; alse hyalinae, fasciis tiibus sordide 

 luteis, prima et secunda perpendicularibus et parallelis, tertia marginali 

 et hide a praecedente usque ad cellulae posterioris secundse apicem per- 

 tinente. 



Clay-yellow, with four longitudinal row3 of black dots on the abdomen ; 

 wings hyaline with three crossbands of a dingy clay-yellow, the first two 

 of which are perpendicular and parallel ; the third forms a border along 

 the margin of the wing, reaching from the second band to the end of 

 the second posterior cell. Long. corp. 0.26 — 0.27 ; long. al. 0.26. 



Syn. Trgpeta palposa Loew, Monogr. I, p. 74, 8. Tab. II, f. 9. 



The quoted description, drawn from an indifferently preserved 

 male, is sufficient for the identification of the species. I will only 

 notice here that in the first line of that description, Cederh., must 

 be read, instead of Cederli, and that on page 75, line 4, the ex- 

 pression "the edge of the tip" means the third band, which forms 

 a border along the last portion of the anterior margin and the 

 apex of the wing. 



Hab. Northern Wisconsin River (Kennicott). 



Observation. — The present species is a type of the genus 

 Trypeta, in the narrower sense, as defined in my Monograph of 

 the European Trypetina. It belongs in the group of those 



