354 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 45. 



XYLONOMUS (XYLONOMUS) PLESroS, new species. 



This species is related to frigidus Cresson, but it may be readily 

 separated from that species by the longitudinal carinse of the first 

 abdominal segment being complete. . 



Female. — Length to the apex of the abdomen 12 mm., length of the 

 ovipositor 12 mm. Face in the middle granular, laterally irregularly, 

 transversely striate; the area between the ocelli and the antennae 

 with well-defined separate punctures; vertex and posterior orbits 

 shining, practically impunctate; postocellar line distinctly longer 

 than the ocellocular line; antennae much longer than the head and 

 thorax, the third and fourth antennal joints subequal; the anterior, 

 lateral angles of the pronotum subtuberculate; prescutum long, well 

 defined; notauli transversely foveolate; scutum and prescutum opaque 

 with fine irregular punctures; mesepisternum shining, impunctate; 

 propodeum opaque, obliquely striato-granular; basal area and areola 

 confluent, areola heptagonal, about one-third longer than its apical 

 width; the posterior legs of the sides one-third longer than the anterior 

 legs and parallel; posterior lateral angles subdentate; first abdominal 

 segment coarsely reticulato-granular, constricted at spiracles, with 

 two longitudinal carinae which originate slightly anterior to the con- 

 striction and extend to the posterior margin; these carinse broaden 

 anteriorly to the constriction, narrow at the constriction and slightly 

 broaden posteriorly; second abdominal segment coarsely reticulato- 

 granular with oblique furrows on the lateral anterior angles; the 

 third and following abdominal segments aciculato-granular. Black; 

 tarsi piceous; wings hyaline, venation dark brown. 



Described from one female in the United States National Museum 

 collection, labelled "Collection of C. V. Riley," 



Type.— Cat. No. 15365, U.S.N.M. 



XYLONOMUS (XYLONOMUS) RUFICOXIS, new species. 



Superficially this species resembles in size and general appearance 

 Jiumeralis Say, but Tiumeralis belongs to a different subgenus. 



Female. — Length to the apex of the abdomen 16 mm., length of the 

 ovipositor 14 mm. Face coarsely striato-punctate; head opaque with 

 a number of widely scattered punctures ; the lateral ocelli much below 

 the supraorbital line, separated from each other by the distance 

 almost twice as great as the ocellocular line; antennae much longer 

 than the head and thorax, the third joint slightly shorter than the 

 fourth; anterior face of the pronotum shinmg, with a number of 

 widely scattered, distinct punctures; dorsal lateral angles of the 

 pronotum strongly, sharply tuberculate; prescutum long, posteriorly 

 strongly, transversely striate, anteriorly shining, along the sides 

 striato-punctate, in the middle with large distinct separate punctures; 



