l66 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



wider than long, the basal prolongations wide, hyaline, ending in a 

 flat, spatulate plate with fingerlike extensions ; ventral surface of body 

 of adminiculum clothed with short hairs, more numerous toward the 

 posterior margin ; central region of adminiculum inflated, more so on 

 the ventral surface than on the dorsal, to form a tubelike structure 

 which extends posteriorly beyond the apical margin of the body of 

 the adminiculum, the extension being longer than the body of the 

 adminiculum itself; in cross section this tube is approximately oval 

 at its base and apex, but toward its midregion it is constricted near 

 the dorsal surface, thereby giving it an hourglass appearance; tube 

 with apical indentation from which extend rather long, curled hairs ; 

 similar hairs present along lateral margins ; very short hairs com- 

 pletely clothe the ventral surface of tube and also the apical part of the 

 dorsal surface. Adminicular arms (pi. 24, fig. 51) with teeth along 

 distal half, the apex with the teeth so grouped as to form a dome ; the 

 lateral plate subquadrangular, wrinkled. 



Female (pi. 30, figs. 166-168, and pi. 35, fig. 237). — 3.7 mm. long. 



Head: Dichoptic. Antenna 630 /* long, 11 -segmented, only slightly 

 tapering ; scape and pedicel yellow, the flagellum dark brown ; segment 

 3 = i-t-2 = 4-f5, 3>ii. Palpi orange-brown at base, the remainder 

 dark brown. Eyes dark brown to black. Fronto-ocular triangle 1 54 /* 

 high, 67 fi at base. Frons, clypeus, fronto-ocular triangle, and occipi- 

 tal region reddish brown, completely invested with grayish-white 

 pruinosity, clypeal hairs short, silvery ; hairs of frons and occipital 

 region black. Buccopharyngeal apparatus with cornuae greatly ex- 

 panded and heavily sclerotized, the dorsal margin serrate along its 

 entire length; border of median space hyaline with pale teeth in a 

 single row. 



Thorax : Mesonotum clear, dark, rust brown, with short, black, 

 appressed hairs sparsely distributed throughout; when viewed from 

 above, with the head directed forward and downward, and with the 

 light source from in front at a 45° angle to the specimen, 2 wedge- 

 shaped, white-pruinose patches are visible, contiguous with the an- 

 terior margin, one on either side of the midline ; the posteriorly di- 

 rected angle of each patch is elongated to form a longitudinal band, 

 also white-pruinose, which extends three-fourths the length of the 

 mesonotum to just before the prescutellar depression, there uniting 

 with the gray-pruinose patch which clothes the posterior fourth of 

 the mesonotum ; extending along the midline, from the anterior margin 

 also to the posterior fourth of the mesonotum, is a very narrow, white- 

 pruinose line; narrow, appressed, silvery-white scales rather evenly 

 distributed on anterior fourth of notum and on its lateral margins; 



