AMERICAN HYMKXOPTERA. 267 



lete. Apex of clvpeus bidentate. Autennre stout, clavate, as long- 

 as the thorax. Abdomen stout, almost sessile, becoming gradually 

 wider to the apex, as long as the 2nd segment. Antennal scape 

 stout, short, about 8 times longer than wide, not longer than the 3rd 

 joint. 



The scutellum is large, fiat, rounded behind ; metanotum short, 

 with a straight oblique slope; the last abdominal segment bluntly 

 rounded ; the ventral surface flat. Legs moderately stout, the tarsi 

 longer than the tibite. Eyes large, slightly converging below. Head 

 wider than the thorax. Tegulse large. 



May be known from Pararnusaris by the sessile abdomen ; from 

 Euparar/ia by the antennte in S being clavate and the scape short, 

 not very long. The body largely marked with yellow as in Ody- 

 7t.eras, to which it has a great resemblance. 



Plesioina^iaris iiiaciiliceps sp. nov. 

 Black ; a large oval mark, longer than broad, in the centre of the clypeus above, 

 a small mark on the vertex touching the end of the eyes, a line on the upper 

 edge of the pronotum, large, roundly dilated at the base, the greater part of the 

 tegulse, a spot below the tubercles, a large mark on the apical half of the scutel- 

 lum, its sides at the base largely, its centre slightly dilated, a line on the apex of 

 the 1st abdominal segment, squarely dilated at the sides, a similar line on the 2nd 

 to 5th roundly dilated laterally, and a line in the centre of the 6th, yellow. 

 Legs black, the knees, the greater part of the 4 hinder tibife and the basal joint 

 of the tarsi, yellow. Wings hyaline, the uervures black ; the 1st recurrent nerv- 

 ure received shortly beyond, the 2nd shortly in front of the middle of the cell- 

 ule; 1st transverse cubital nervure oblique, the 3rd broadly rounded. The whole 

 body and legs densely covered with silvery pubescence. Head and thorax aluta- 

 ceous, the pleurje closely punctured ; the metathorax less closely punctured and 

 with a curved furrow behind the middle on the lower two-thirds; the upper part 

 at the base bears some stout irregular stria;. Clypeal teeth long, stout, narrowed 

 towards the apex, which is smooth, the rest being punctured. Base of mandibles 

 punctured, the middle rufous; both the teeth are bluntly rounded. The outer 

 eye orbits are clearly margined. Length 8 mm. 



Hab. — Mexico. 



TRANS. AM. ENT. SOC. XXX. SEPTEMBER. 1904. 



