260 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lu 



concave, and the dorsum is highly arched with its highest point at the 

 junction of tergites in and iv. Otherwise the paratypes agree with 

 the holotype. 



Remarks: Although Uptisoma is somewhat similar to pygmaeus 

 White from Tasmania, the two can easily be separated by the male 

 genitalia. Closest relatives appear to be the Nearctic species 

 vittisternum Sabrosky, shewelli Sabrosky, and colei Sabrosky, as noted 

 by structures of the male genitalia (compare pi. 10, figs. 61-64 and 

 pi. 12, figs. 95-98). There is no known close relative in New Zealand. 

 The name leptisoma refers to the scale-like pile of the abdomen, 



Ogcodes (Ogcofles) argigaster, new species 



Plate figures 14, 53, 89 



Species of group iv. 



Male: Length of entire specimen 6.10 mm., wing length 6.00 mm. 



Head dark brown except for black occiput; ocellar tubercle small, 

 hardly protruding, frons large, protruding and depressed medially; 

 apex of terminal antennal segment with two minute setae; mouth area 

 oval. 



Thorax shining black, covered with long whitish yellow pile about 

 as long as antennal segment in; legs slender, onlj^ apex of hind femur 

 swollen, coxae, trochanters, knees, last tarsal segment and claw dark 

 brown, femora infuscated, tibiae and remainder of tarsi whitish yellow; 

 wing transparent, veins white; vein Mi present but crease-like, not 

 distinct, crossvein m-cu present, r-m crossvein faint, indistinct, anal 

 vein separated from Cu2 at wing margin (pi. 4, fig. 14) ; squama ver- 

 tically raised near base, arched throughout, white with thin yellow 

 margin, halter knob dark brown, stem lighter brown. 



Abdomen opaque white except for dark brown on most of tergite i, 

 small median spot on ii, all of iv, lateral margin of sternite i, genitalia 

 and spiracles; posterior portion of segments ii-iv with narrow j^ellow 

 margins; tergites covered with long white pile along lateral margins 

 and median area of ii to the base of iv, with short, dense, downy pile 

 on mesolateral part of tergite ii, otherwise dorsum shining and bare; 

 venter covered with long pile on middle two-thirds of each sternite 

 throughout its width except sternite ii with somewhat longer pile and 

 I bare. 



Genitalia small, aedeagus pointed apically with large, postgonoporal 

 notch; aedeagal sheath long, reaching out near tip of aedeagus (pi. 9, 

 fig. 53); ejaculatory apodeme of medium build, median plate directed 

 anteriorly (pi. 12, fig. 89). 



Female: Unknown. 



Holotype: Male, Cass, New Zealand (USNM 64439); Icf, 

 paratope type (USNM). 



