196 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 1 25 



half of basitarsus and of second tarsal segment light brown, the re- 

 mainder of these segments, as well as all of segments 3-5, black ; basi- 

 tarsus parallel-sided ; relation of basitarsus to second tarsal segment, 

 4:1; calcipala small, straight, reaching only halfway to pedisulcus ; 

 pedisulcus not deeply incised, on basal third of second tarsal segment. 



Abdomen : Tergite of segment i tan, the pleurites black with very 

 long tan hairs reaching third segment. Anterior two-thirds of seg- 

 ment 2 brown, white-pruinose, the posterior third black. All remain- 

 ing segments black except the sixth, which is dark brown with white 

 pruinosity ; all segments with short black hairs. Sternites brown. 



Genitalia: Sidepiece (pi. 24, fig. 65) quadrangular, somewhat 

 wider than long ; dorsal opening also quadrangular in shape, occupying 

 more than half of sidepiece. Length of clasper (pi. 24, fig. 65) three 

 times its width, both margins sinuous, the bulge on the outer margin 

 being more pronounced ; apex narrower than remainder of clasper, 

 somewhat truncate, with a single, well-developed terminal spine near 

 the apical margin. Body of adminiculum (pi. 24, fig. 66) rectangular 

 in shape, much wider than long, with a very long, slender, apical pro- 

 longation, the latter longer and more slender than that of acatenan- 

 goensis Dalmat, mathesoni Vargas, or virgatnm Coquillett ; prolonga- 

 tion constricted near its midregion, with numerous hairs along its sur- 

 face ; posterior angles of body of adminiculum somewhat exaggerated ; 

 basal prolongations broad, well sclerotized, and spatulate; body of 

 adminiculum covered with very fine, short hairs. Adminicular arms 

 (pi. 24, fig. 64) with approximately 4 rather dull teeth, all approxi- 

 mately of the same length, arranged in about 2 longitudinal rows; 

 lateral plate long, rectangular, well sclerotized. 



Female (pi. 31, figs. 184-186, and pi. 35, fig. 242). — 4.0 mm. long. 



Head : Dichoptic. Eyes dark brown ; height of fronto-ocular tri- 

 angle equal to the base. Antenna 560 p., ii-segmented ; segment 3 

 very wide, equal to one-half H-2, 3 = 4-1-5; segment 11 longer than 

 any other segment ; scape and pedicel tan, segments 3, 4, and 5 brown, 

 the remaining flagellar segments black. Palpi dark brown to black. 

 Frons brown, white-pruinose, with 3 irregular rows of strong black 

 hairs on each of its margins. Clypeus brown, white-pruinose, with 4 

 irregular rows of strong black hairs on each lateral margin. Occipital 

 region dark brown, white-pruinose, covered with strong black hairs. 

 Cornuae of buccopharyngeal apparatus short, well sclerotized, bifur- 

 cated at their apices ; median space hyaline, very slightly serrated. 



Thorax : Mesonotum shiny, light rust brown, with 2 bands of 

 white pruinosity, wider at their anterior extremities, extending longi- 

 tudinally from 2 white-pruinose triangles situated on the anterior 



