122 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



slender, the apical segments somewhat wider than the basal ones; 

 segment 3<i+2, 3<4 + 5, 3>ii ; scape, pedicel, and basal three seg- 

 ments of flagellum brown, the remaining segments dark brown. Palpi 

 black. Clypeus black, white-pruinose, irregularly covered with short 

 black hairs. 



Thorax : Ivlesonotum velvety brown ; 2 strong white-pruinose tri- 

 angles, one on either side of the midline, the base contiguous with the 

 anterior margin of scutum ; posterior to each of these triangles, and 

 somewhat more removed from the midline, is another white-pruinose 

 triangle that is elongate, its base facing anteriorly and its apex reach- 

 ing beyond the anterior half of the scutum; lateral margins of mesono- 

 tum, as well as the prescutellar region, also white-pruinose, these 

 pruinose regions separated by area of base color; few long, narrow, 

 yellow, scalelike hairs on prescutellar region and on the long white- 

 pruinose triangles ; anterior half of mesonotum sparsely clothed with 

 short, lustrous, brown hairs. Humeral angles somewhat lighter than 

 mesonotum in general, each with transverse patch of white pruinosity, 

 and with a few yellow scalelike hairs. Scutellum triangular in shape, 

 the angles sharp ; velvety brown, with long black hairs along the outer 

 margins. Postnotum velvety brown, with triangular patch of gray 

 pruinosity, the apex pointing posteriorly. Pleura of mesothorax vel- 

 vety brown, covered with shiny-white pruinosity ; pre-alar group com- 

 posed of yellow hairs. Stem of halter brown, the knob pale yellow to 

 cream. Wings, 1.8 mm. long and 0.85 mm. wide; relation of body 

 length to wing, 1.2: i ; Sc pilose along its basal fifth (3 hairs) ; Ri 

 spiny and with a few hairs along its distal half ; R2+3 pilose along its 

 distal four-fifths ; Cu2 arcuate ; discal cell absent. 



Legs: Leg i, length, 2.0 mm.; coxa and trochanter dark brown; 

 femur light brown on basal two-thirds, dark brown on apical third ; 

 tibia dark brown, its midregion somewhat lighter ; tarsus dark brown. 

 Leg 2, length, 1.7 mm. ; coxa, trochanter, and femur dark brown, the 

 femur somewhat lighter on its midregion; tibia black, with yellow 

 basal ring; tarsal segments 1-3 yellow on basal half, brown apically; 

 segments 4 and 5 brown. Leg 3, length, 2.1 mm. ; coxa and trochanter 

 dark brown ; femur light brown on basal two-thirds, dark brown on 

 apical third ; tibia dark brown, with yellow basal ring ; apical region 

 of tibia with concentration of short hairs that are very close together ; 

 apex almost pointed ; there is a rather distinct angle, the more apical 

 region again tapering ; basal two-thirds of basitarsus and of second 

 tarsal segment tan, the remainder of these segments, as well as tarsal 

 segments 3-5, dark brown ; relation of basitarsus to second tarsal seg- 

 ment, 4.2 : I ; basitarsus with apical end truncate, the calcipala occu- 



