76 PROCEEDINGS OF THE jSTATIONAL MUSEUM. vou 63. 



rounded posteriorly at apex; scutelliim transverse, very highly con- 

 vex, narrowly margined laterally, polished, spareely pubescent; 

 metapleurae, propodeum, and first sternite, pubescent; first and 

 second tergites not pubescent; abdomen spatulate, with the broadest 

 part just behind the middle, one and three-fourths times as long as 

 wide; first tergite distinctly less than twice as long as wide, the 

 median area broad, with three or four longitudinal carinae, a little 

 longer than wide, wider than the lateral areas, the dorso-latcral ridges 

 prominent, perpendicular outwardly; second tergite five-sixths times 

 as long as wide; basal foveae strongly striate, the striae extending 

 about to the middle of the segment ; space between foveae strongly 

 striate, the striae short, not attaining the apices of the foveae; 

 remaining segments united half as long as the second; tergites three, 

 four, and five subequal in length: six slightly longer, subacute apically, 

 a little wider than long; wings hyaline, extending slightly beyond 

 the apex of the abdomen. Dark reddish brown; antennae and legs 

 brown, the tarsi and tips of anterior tibiae lighter. 



Male. — Length 1 mm. Antennae rather stout; pedicel globular, 

 scarcely longer than wide, as long as joint four and about as wide as 

 that joint at the middle; third joint minute, half as wide as the ped- 

 icel, about as wide as long; four much widened apically, obliquely 

 excised basally, the lower side straight; joints five to nine inclusive 

 moniliform, as long as wide, as wide as the fourth; tenth joint as 

 long as the two preceding united and as wide as either, shaped as 

 in asynaptae; abdomen spatulate, slightly longer than, but just as 

 wide as, the thorax, broadly rounded apically; wings extending the 

 length of the second tergite past the apex of the abdomen. 



Type locality. — Lancaster, Los Angeles County, California. 



Type.— C&t. No. 2286 U.S.N.M. Type female and allotype male 

 selected. 



Redescribed from the type series of 21 specimens. They were 

 reared by A. Koebele, December 6, 1887, from a Ceoidomyid gall 

 found on Artemisia californica. 



The striations on the second tergite are susceptible to some 

 variation. Sometimes the median striae extend to the middle of the 

 tergite and at other times are much shorter. 



42. PLATYGASTER SALICICOLA (Ashmead^, 



Polygnotus salicicola Ashmead, Bull. 45, U. S. Nat. Mus., 1893, p. 305. — Brues, 

 Bull. 22, Conn. Geol. Nat. Hist. Surv., 1916 (1917), p. 539. 



Female. — Length 1.5 mm. Head twice as wide as long through 

 the middle of the occiput, ylightly excavated behind, a little wider 

 than the thorax across the tegulae; occiput rather strongly trans- 

 versely striate ; cheeks shagreened posteriorly ; interocellar area very 

 faintly shagreened ; frons covered with fine undulating aciculate; an ten- 



