88 [August 



beneath and remainder of the tarsi, fuscous. Abdomen ovate, subde. 

 pressed, regularly narrowed towards the base, the basal segment only 

 slightly constricted at tip; minutely punctured, the apical segments 

 more distinctly so; first segment with a rounded, sometimes transverse, 

 uneven, yellow spot on each side near the tip; the second and three 

 following segments each with a narrow, subapical, yellow fascia, that 

 on the second segment narrowed in the middle where it is more or less 

 interrupted ; that on the third segment is also sometimes slightly in- 

 terrupted ; those on the fourth and fitth segments are continuous and 

 sometimes a little wavy ; apical segment depressed, rugulose. rounded 

 at tip ; venter smooth, shining, black or piceous-black. immaculate, 

 sparsely punctured. Length of' — 6? lines; expanse of wings 10 — IH 

 lines. 



Male. — Smaller and narrower than the female ; the head is not trans- 

 versely compressed ; the stripes on the face are broader, the middle 

 one tapering towards the insertion of the antennae between which is a 

 yellow dot ; the posterior orbit has a short yellow line ; the antennae 

 are longer and more slender at base, the scape is yellow in front, and 

 the flagellum rufo-testaceous beneath towards the base; the line on the 

 collar is uninterrupted, the pleura has a transverse lunate spot beneath 

 the anterior wing, the scutellum has a broad transverse yellow band at 

 base, and the postscutellum has a transverse spot of the same color; the 

 spot on the tegul^e is larger ; the wings are clearer and iridescent ; the 

 anterior coxae have a large yellow spot beneath, and the posterior pair 

 are yellow at tips, with a spot on their trochanters beneath ; all the 

 femora have a more or less dilated yellow line beneath, while the tibiae 

 and tarsi are more yellowish than in the female ; the abdomen is nar- 

 rower and convex, not at all depressed; the ornamentation is much the 

 same, only the band on the second segment is not broader than those 

 on the following segments ; the sixth segment has a transverse spot on 

 each side; the venter has a yellow fascia on each of the second, third 

 and fourth segments, the first interrupted in the middle. ]jength 5 

 lines ; expanse of wings 8 lines. 



Huh.— - Xova Scotia." (Smith) ; Canada West, (Mr. B. Billings. 

 Jr.) Coll. Ent. Soc. Philad. 



Three 9 . one % , specimens. A female specimen, collected in Colora- 

 do Territory by Mr. James Ridings, difiers from those from Canada a.< 

 follows: the three yellow stripes on the face are irregular and broken, 

 the spot beneath the antennae is much reduced, while that on the mid- 

 dle of the clypeus is larger, rounded above and emarginated benciith ; 



