OF WASHINGTON, VOLUME XIX, 1917 93 



and concealed below the facial flange; the labrum is small, free, 

 present between bases of mandibles; the vertex is tubereulate; 

 the antennae of the female are 10-jointed, with the ninth joint 

 large and the apical one small, in the male they are slender, nor- 

 mal and 11-jointed; the pronotum is narrow, the posterior margin 

 arcuate; the mesoscutellum is truncate anteriorly and separated 

 from the mesoscutum by its entire width; the metapostnotum is 

 wanting; the wings have two cubital cells, one recurrent vein and 

 one or two closed anal cells; the anterior tarsi of the female are 

 three jointed, of the male five jointed; the abdomen is heavily 

 chitinized, cylindrical, the first tergite joined to the thorax by its 

 entire width but not becoming part of the second division of the 

 body, the second segment united with the first by its entire width 

 and not separated from it by a socket-like joint; the first two 

 tergites are more coarsely sculptured than the following, and the 

 suture between the second and third is foveolate. Lying below 

 and on each side of the eighth tergite in the female is a large 

 heavily chitinized plate, the two together forming ventrally a 

 channel for the reception of the ovipositor, and each bearing at 

 its tip a small triangular appendage. These plates apparently 

 represent the fused ninth and tenth tergites which are longitu- 

 dinally divided dorsally, and the appendages are apparently the 

 cerci; the eighth sternite is internal and lies above and somewhat 

 behind the ninth, and is represented by two triangular plates, from 

 the upper angle of which originate the lancets (first gonopoph- 

 yses), 1 the ninth sternite is also internal, lying below and in 

 front of the eighth and represented by two more or less triangular 

 plates which extend postero-ventrad; the lance (second gono- 

 pophyses) originates from the inner ends of these plates and be- 

 comes fused a short distance cephalad of its origin; the two parts 

 of the sheath (third gonopophyses) arise from the apices. Shortly 

 cephalad of the origin of the lance and lancets the latter enter 

 the groove of the former, the complete ovipositor as thus formed 

 extending cephalad in an inverted position enclosed within a 

 membraneous sac, probably invagin:ited intersegmental skin, 

 into the mesothorax, where it is coiled, and returning upon itself 

 continues caudad in its normal position and enters the base of 

 the sheath. 



The reason for the formation in the pupa of the long external 

 ovipositor is inexplicable,, and its reduction to the form existing 



1 Sno.lgrass (Tech. Ser. IS Bur. Km. U. S. Dept. Agr., 1910, p. jr. . 

 Numbers, were, outer goaopophyses of the ninth sternite 2 and the inner 3. 

 This numbering is not in accord with the numbering further on in the work. 

 In the present p.-iper the numbering of the gonopophyses of the 9th sternite 

 as given liy Snodgrnss on p. 25, figures 7 and 8, is reversed. 



