AMEPaCAN HYMENOPTERA. 95 



telliinis iinpiiiu'.tate. The basal half of the nietanotiim deeply and closely punc- 

 tured ; in the centre irregularly transversely striated ; the striae curved and 

 widely separated and bordered by a stout, smooth longitudinal keel; the sides 

 and the apical slope slightly shagreened. Abdominal segments punctured, ex- 

 cept on the apex ; the penultimate segment is more opaque, thickly covered with 

 black hair and with a smooth, shining keel in the centre; the last is more opaque 

 and is stoutly keeled in the centre. Coxse, trochanters and femora shining; the 

 tibiae and tarsi more opaque, thickly covered with a dark silvery pile; the calca- 

 ria black, the tarsal spines dark rufous. 



Hab. — Panama, proliably the Port (Matliew). 



The large .smooth tegulse have only a few punctures at the base; 

 they reach close to the apex of the scutellum ; the flagellum of the 

 antennae is opaque, the middle joints slightly dilated below ; the 

 scape shining, strongly punctured and with short hairs; the ba.se of 

 the prothorax is stoutly keeled above ; on the sides, behind this, is 

 an oblique furrow ; tlie apex of the metanotum and the ba.se of the 

 abdomen are covered thickly with a grey pile. 



JWysson cres!>ioiii sp. nov. 



Anal cellule of hind wiugs terminating at the origin of the cubital nervure; 

 the hinder tibiae not spinose; the 2nd ventral segment not angled. Black, 

 densely covered with silvery pubescence; the apex of the labrum broadly, a 

 mark on the apex of the clypeus at the sides, a line on the inner eye orbits oppo- 

 site the tegulae and the apices of the basal five segments of the abdomen, a line 

 on the base of the fore til)i8e in front and the apical joints of the fore tarsi, yel- 

 low. Wings clear hyaline with black nervures. Flagellum of antenufe brown- 

 ish beneath. 9 • 



Length 5 mm. 



Vertex sparsely punctured, densely covered with silvery pubescence; tlie lower 

 part of the front impunctate. Pro- and mesothorax sparsely, weakly punctured, 

 shining, as are also the scutellum and postscutellum ; the pronotum with a 

 widely interrupted yellow line. The basal area of the median segment shining, 

 distinctly but not very closely punctured ; the rest of the segment opaque, much 

 more closely and less strongly punctured ; there is a distinct pyriform dejiression 

 on the apical slope, bordered by a furrow on either side ; the projecting sides are 

 largely and deeply incised in the centre ; the incision is as long as it is wide at 

 the apex. Abdomen shining, sparsely punctured ; in certain lights with viola- 

 ceous tints. Pygidial area opaque, broad, rounded at the apex, obscurely rugose. 

 Temples not mai'gined. Vertex and front without keels or tubercles. 



The apical nervures in the hind wings are obliterated ; the cubital cellule is 

 confluent with the marginal and discoidal ; the transverse cubital nervure is 

 roundly curved outwardly. 



Hub. — "N.Mexico." 



I have had this little species in my collection marked as unde 

 scribed for many years. The label has written on it "N. Mexico;" 



TR.A.NS. AM. ENT. SOC, XXX. .M.\RCH, 1904. 



