178 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



shaped, which is clothed with numerous hairs ; remainder of ventral 

 surface with few hairs ; basal prolongations with their ends well scle- 

 rotized and spatulate, a membrane on the inner margin of each which 

 reaches the body of the adminiculum. Adminicular arms (pi. 24, 

 fig. 54) with about 35 very long teeth arranged in linear form, perpen- 

 dicular to the long axis of the arm; lateral plate rectangular, wide, 

 somewhat sclerotized. 



Female (pi. 31, figs. 172-174, and pi. 35, fig. 238). — 4.0 mm. long. 



Head: Dichoptic. Eyes black ; height of fronto-ocular triangle i .7 

 times the base. Antenna 750 /t long, i i-segmented, very slightly taper- 

 ing, widest at third segment, last segment blunt ; segment 3 < i + 2, 

 4 + 5, or II ; scape and pedicel tan, the flagellum light brown, becoming 

 dark toward the apex. Palpi light brown near base and dark brown 

 toward apex. Frons brown, with white pruinosity and a row of hairs 

 along its periphery. Clypeus brown, with white pruinosity and several 

 rows of tan hairs on lateral margins. Occipital region brown, with 

 white pruinosity and numerous black hairs. Cornuae of buccopharyn- 

 geal apparatus slightly sclerotized, large, flattened ; median space hya- 

 line, with many wide, scalelike teeth in irregular rows. 



Thorax : Mesonotum shiny, copper-colored, completely white- 

 pruinose, with no definite stripes or designs ; narrow, minute, silvery 

 scalelike hairs widely scattered over entire mesonotum, arranged in 

 groups of 2-3 along anterior margin, somewhat longer in prescutellar 

 region ; short black hairs evenly distributed over entire mesonotum, 

 long black hairs in prescutellar region. Humeral angles white-prui- 

 nose, anterior region covered with tan-colored hairs. Scutellum shiny 

 light brown, anterior margin somewhat darker, invested with several 

 long, strong, black hairs and numerous silvery scalelike hairs, longer 

 than those on mesonotum. Postnotum shiny brown, with white prui- 

 nosity but no hairs or scales. Pleura light brown, evenly white- 

 pruinose. Stem of halter brown, knob cuplike, tan. Wings, 3.8 mm. 

 long and 1.7 mm. wide; relation of body to wings, i.i : i ; Sc com- 

 pletely pilose ; Ri pilose along apical three-fifths, all but short apical 

 portion of pilose region with spines as well as hairs ; R2+3 pilose except 

 for small basal section ; Cua arcuate ; discal cell absent. 



Legs: Leg i, 4.3 mm.; coxa, trochanter, and femur yellow; tibia 

 and tarsus black. Leg 2, 3.9 mm. ; coxa dark reddish brown ; tro- 

 chanter yellow ; femur brown except for dark-brown apical ring ; 

 tibia with middle region brown, both extremities dark brown ; basal 

 two-thirds of basitarsus yellow, apical third dark brown; basal 

 third of second tarsal segment yellow, remainder dark brown ; seg- 

 ments 3-5 dark brown. Leg 3, 4.6 mm, ; coxa dark reddish brown ; 



