230 PROCEEDINGS OP THE NATIONAL MUSEUM. 



prominent carina between the bases of the antennae; frontal impress- 

 ed line incomplete; ocellocular line less than one-half the length of 

 the postocellar line ; scutum opaque, finely, rather closely, punctured 

 with smaller indistinct punctures in the interspaces ; scutellum more 

 sparsely sculptured, not impressed; propodeum without a median 

 carina dorsally, the surface reticulate, with a few prominent ridges 

 basally; mesepisternum shining, finely granular; sides of the pro- 

 podeum with uniform obhque striae. Black; tibial spurs whitish; 

 apical joints of the tarsi shghtly reddish; wings hyaline, iridescent, 

 with the apical margin dusky, venation dark brown. 



Type locality. — St. Louis, Missouri. 



Parattjpe locality. — Northern Illinois, Described from two females 

 from the type locality, the type Rau No. 3135, the paratype under 

 Rau No. 2337; and three females from the paratype locality. 



Type.— C&t. No. 21611, U.S.N.M. 



CERCERIS RAUI, new species. 



The female of this species loofe very much like hicornuta Guerin, 

 but the clypeus extends forward as a free plate. The general struc- 

 ture of the clypeus is sunilar to that oi frontaia Say, but the darker 

 body color a,nd darker wings readily separated this from Say's 

 species. 



Female. — Length, 20 mm. The median prominence of the clypeus 

 free, projecting at an angle of about 30 degrees from the front; 

 the anterior margin deeply, arcuately emarginate, the lobes narrow, 

 triangular; this frontal projection is one-third wider than its greatest 

 length; the apical margin wath dense yellowish hair; face and pos- 

 terior orbits with large, close punctures; superior orbits and vertex 

 shining with large, separate punctures; sides of the pronotum with 

 a few rugae, the anterior one much stronger; mesepisternum punc- 

 tato-reticulate with small punctures in the interspaces; mesoscutum 

 with large, irregular, sometimes confluent punctures and with smaller 

 intermediate punctures posteriorly; scutellum with scattered punc- 

 tures; propodeal inclosure finely granular (under high magnification) 

 with a few large, sparse, well-defined punctures ; first tergite with a 

 median depression posteriorly; abdomen with large separate punc- 

 tures; the fourth and following segments with smaller, somewhat 

 more widely separated punctures; pygidium truncate apically, apical 

 and basal width subequal ; sides slightly rounded so the margin vndth 

 is somewhat greater; sides with a strong fringe of reddish hair. 

 Black and f ermginous ; head ferruginous, witli clypeus, spot between 

 the antennae and spot on the posterior orbits above yellow; the 

 middle of the face, frons, and a supraorbital spot black; antennae 

 black with the basal four joints and following three joints beneath 

 ruf o-f erruginous ; thorax black; pronotum dorsally, two large spots 



