318 [September 



the grooves white, more distinctly so at tip. Length 13 Unes; of ovi- 

 positor 25 lines; expanse of wings 22 lines. 



Hah. — Rocky Mountains, Colorado Territory. 



It gives me pleasure to dedicate this most elegant species to Mr. Ed- 

 ward Norton, the distinguished American hymenopterist. 



2. Rhyssa albomaculata. u. sp. 



Black : anteunje with a broad while annulus ; thorax and abdomen spotted 

 with white; legs pale fulvous; wings hyaline. 



FcmaJc. — Black, shining ; the orbits white ; antennae three-fourths 

 the length of the body, black, with a broad white annulus near the tip. 

 Thorax gibbous, the mesothorax transversely rugose, the pleura smooth 

 and polished; a broad line on each side just beneath the mesothorax, 

 a transverse mark on each side of the collar, the tegul*, a spot beneath 

 the wings, and an elongate, slightly oblique mark above and a little 

 before the middle coxae, all white; scutellum black, its apical half white, 

 slightly emarginate before, also a small transverse white spot behind ; 

 metathorax rather smooth at base, transversely aciculate at apex, on 

 each side behind a large white spot, and just beneath a smaller white 

 spot. Wings hyaline, the nervures black, pale at base, stigma also 

 black, with a pale spot at base ; areolet minute, petiolated. Legs pale 

 fulvous, the four anterior coxae with a lateral white spot, the middle 

 ones elongate; posterior coxae with a white spot at base above; tips of 

 the posterior tibiae and of all the tarsi, dusky. Abdomen black, shin- 

 ing ; the two basal segments with an" angular white mark on each side 

 at tip ; the four following segments with two spots on each side, the 

 extreme lateral ones longitudinal and pointed before ; on each side of 

 the 7th segment a broad, oblique, white stripe ; ovipositor longer than 

 the body, piceous, the valves black, their extreme tips within, white. 

 Length II2 lines; of ovipositor 131 lines; expanse of wings 17 lines, 



ILth. — New Jersey. E. T. Cresson. 



Very similar to R. persuasoria Linn., formerly known only as a Eu- 

 ropean species, but of which I have a 9 and 2 % specimens from the 

 liocky Mountains, precisely identical with European specimens with 

 which I have carefully compared them, both % and 9 . The 9 of R. 

 persuawria differs from the 9 albomaculata, above described, as follows : 

 The antennae are entirely black, the spots on the pleura are much re- 



