AMEPaCAN HYMENOPTERa. 237 



ADDITIO^^i TO .SPHEliOIDEA (H Y'MEXOPTEKA). 



BY HENRY L. VIERECK. 

 MYSSOXID.E. 



SJysson f^iibmellipes u. sp. 



Near to mellipes, differing chiefly in the curved unevenly spaced 

 ridges on the uietathorax and by the salient ridge hounding the 

 superior border of the posterior face of the rather distinctly truncate 

 metathorax. 



%, . 8 uim. long. Head. — Front protuberiint, with rather shallow adjoining 

 punctures and no raised line; ocelli as if set in around a node, distance between 

 posterior ocelli a little less than that between them and nearest eye margin; 

 cheek unniargined, with separated j.unctures; clypeus convex, smooth, indis- 

 tinctly punctured and covered with dense appressed silvery pubescence; face 

 along the eye margin u]) to the emargination and between the antennse pubes- 

 cent like the clypeus, a blunt projection between the antennae; scape nearly 

 oblong, a little shorter than the next three joints of the antenna together; pedi- 

 cellum a little longer than the first joint of the flagellura ; joints of the flagellum 

 subequal, terminal joint obtuse at tip. penultimate joint simple. 



Thorax. — Dorsulum punctured much like the front; scutellum more coarsely 

 punctured than the dorsulum; punctures on mesopleura not so deep as on the 

 dorsulum; spines of the metathorax short and stout, directed upward and out- 

 ward; superior face of the metathorax, in the middle, with regular, strong 

 ridges, posterior face of the metathorax with fine, dull, reticulate, longitudinal 

 areas surmounted by a rather shining, uneven, transverse area which separates 

 the superior from the posterior face; legs smooth, posterior tibiae not spinose; 

 wings dark brownish with purple reflections, nervures black ; transverse median 

 nervure terminating a little beyond the basal nervure, third transverse cubitus 

 joining the marginal cell where the petiole of the second submarginal cell joins 

 the marginal cell, second submarginal cell almost forming an obtuse triangle. 



Abdomen. — Punctures on the first abdominal segment rather deep, distinctly 

 defined and close together, the punctures of the succeeding segments smaller but 

 denser; integument dull, sericeous; the two teeth at apex of abdomen short. 



Black; mandibles reddish except at base and apex; legs reddish, infuscated 

 at base; scape partly reddish ; pi-onotum, tubercles, transverse irregular band on 

 the scutellum and bands on segments 1, 2, 3 and 4 of abdomen yellow, the band 

 on the first segment nearly interrupted, on segments 2 and 3 broadly interrupted 

 on the fourth segment rei>reseuted by dots; tegulre partly brownish. 



Type locality, Riverton, New Jersey. Type, Acad. Nat. Sci., 

 Phil'a. August 7, 1901 (C. W. Johnson). 



Nysson tramosericns n. sp. 



Nearest to albomarginatu.s, from which it differs at once by the 



TKANS. AM. ENT. SOC. XXX. AUGUST. 1904. 



