282 E. T. CRESSON. 



Bfysson fidelis n. sp. — 9- — Black, opaque; head finely and densely punc- 

 tured, space within ocelli not raised: line on posterior margin of prothorax, 

 tubercles, a transverse line or spot on each side at apex of abdominal segments 

 1 — 4 above, those on first segment more or less notched anteriorly, white; tegulse 

 and all the tarsi more or less, dull testaceous ; mesothorax and scutellum, finely 

 and very densely punctured, subgranulated; ajjex of scutellum and the post- 

 scutellum finely longitudinally rugose; mesopleura rugose; basal middle of meta- 

 thorax above with coarse longitudinal ridges, the sides above the prominent 

 subacute spine with silvery pile ; wings subhyaline, in the posterior pair the 

 anal and discoidal cells are separated by a very short, thickened transverse or 

 longitudinal nervure; abdomen feebly and sparsely punctured. Length .27 inch. 



%, . — Clothed with a very short silvery sericeous pile, most dense on face, 

 clypeus, mesopleura, sides of metathorax above and coxae; clypeus, mandibles 

 except tips, scape beneath, subinterrupted line on posterior margin of prothorax, 

 tubercles, anterior coxae beneath, spot on outer side of four posterior coxae, 

 anterior tibiae and tarsi in front, spot at tip of anterior tibiae, a narrow band on 

 posterior margin of abdominal segments 1 — 6 above, more or less interrupted in 

 middle, all white; tips of mandibles, tegulae, and all the tarsi more or less, dull 

 testaceous; antennae thickened apically, the terminal joint as long as the two 

 preceding taken together, obtuse at tij) and emarginate beneath ; the white band 

 on sides of first abdominal segment above is slightly notched anteriorly, and the 

 seventh segment above has two short teeth at tip. Length .28 inch. 



Hnb. — Montana, Colorado, (Morrison). Four ^ , one % specimens. 

 Closely allied to lateralis, but the punctures of the head and thorax 

 are finer and more dense, and those of" the abdomen above much more 

 feeble and sparse. 



IVysson lateralis Packard, Proc. Ent. Soc. Phil, vi, p. 440, '^ . — 9 • — Black, 



opaque; head finely and closely punctured; sides of face, clypeus and cheeks 

 clothed with a short, white pubescence; clypeus shining, sparsely punctured; 

 tips of mandibles rufo-piceous; space within the ocelli not raised; mesothorax 

 strongly and closely punctured; mesopleura and scutellum coarsely and con- 

 fluently punctured ; metathorax coarsely reticulated, the basal middle above with 

 longitudinal elevated lines, the lateral spines short and acute; three approximated 

 dots on middle of posterior margin of prothorax, tubercles, and transverse spot 

 on lateral posterior margin of abdominal segments 1 — 3 above, yellowish-white; 

 wings smoky hyaline, in the posterior pair the anal and discoidal cells are sepa- 

 rated by a very short thickened transverse nej-vure; abdomen shining, strongly 

 and rather sparsely punctured, more closely so on apical segments, second ventral 

 segment strongly and sparsely punctured. Length .26 inch. 



% . — More slender than 9 i^"*! more closely and strongly punctured, the face, 

 clypeus, sides of thorax and coxae silvery ; antennae thickened at tip, the apical 

 joint as long as the two preceding joints together, truncate at tip and broadly 

 emarginate beneath ; tarsi fuscous ; apical segment of abdomen above truncate 

 at tip, with a rather long acute tooth on each side. Length .26 inch. 



Hab. — New Hampshire, Virginia. Two specimens. 



Nysson rusticus n. sp. — 9- — Black, opaque, sericeous with pale pile; 

 head and thorax very finely and densely punctured ; space between the ocelli 

 not raised ; one specimen has the tubercles and two distant spots on posterior 



