NO. I BLACK FLIES OF GUATEMALA — DALMAT 205 



basal and apical fourths of femur black, middle region light brown ; 

 tibia and tarsus black. Leg 2, length, 3.0 mm. ; coxa brown ; trochanter 

 tan ; femur with basal two-thirds tan, apical third black ; tibia black 

 except for basal tan ring ; basal half of basitarsus tan, remainder black ; 

 tarsal segments 2-5 black. Leg 3, length, 3.8 mm. ; coxa black ; tro- 

 chanter tan ; femur with basal fourth tan, the remainder black ; tibia 

 black, with small basal tan ring ; basal half of basitarsus tan, the apical 

 half, as well as all of tarsal segments 2-5, black ; basitarsus parallel- 

 sided, with only slight expansion; relation of basitarsus to second 

 tarsal segment, 4.1 : i ; calcipala well formed, small, broad, reaching 

 only halfway to pedisulcus ; pedisulcus hardly discernible, formed on 

 basal third of second segment. 



Abdomen : Tergite of segment i very dark brown, covered with 

 short hairs ; pleurites black, with numerous long tan hairs reaching 

 fifth segment. Segment 2 black, with white pruinosity. All other seg- 

 ments black, the pleura somewhat white-pruinose. Sternites brown. 



Genitalia: Sidepiece (pi. 25, fig. 70) quadrangular, wider than 

 long; dorsal opening occupying almost two-thirds of dorsal surface 

 of sidepiece. Length of clasper (pi. 25, fig. 70) three times its width, 

 its margins sinuous, a large bulge on the outer margin ; apex nar- 

 rowed, rounded, but blunt ; a single apical spine almost terminal in 

 position. Body of adminiculum (pi. 25, fig. 71) wider than long, 

 somewhat rectangular in shape, the posterior angles well rounded; 

 apex with indentation from which extends a small crown of short 

 hairs ; no apical prolongation ; sides of body appear to be in form of 

 winglike expansions ; basal processes short, more heavily sclerotized 

 than the rest of adminiculum, somewhat pointed. Arms of adminicu- 

 lum (pi. 25, fig. 72) with approximately 35 teeth arranged in linear 

 fashion, the longer teeth toward the end, forming a clublike apex; 

 lateral plate broadly triangular, lightly sclerotized. 



Female (pi. 32, figs. 190-192, and pi. 35, fig. 244).— 3.1 mm. long. 



Head : Dichoptic. Eyes reddish black ; height of fronto-ocular tri- 

 angle 1.8 times the base. Antenna 580 /x long, 11 -segmented, slightly 

 tapering ; third segment widest, segment 1 1 pointed ; segment 3< i +2, 

 3 = 4+5=11; scape, pedicel, and first segment of flagellum light 

 brown, the remaining segments dark reddish brown. Palpi dark 

 brown, the apex darkest. Frons brown, white-pruinose, with black 

 hairs around periphery. Clypeus brown, white-pruinose, covered with 

 black hairs. Occipital region grayish black, white-pruinose, with black 

 hairs. Cornuae of buccopharyngeal apparatus well sclerotized, the 

 ends bifurcated ; median space somewhat sclerotized, thickened, with 

 a single irregular row of scalelike teeth. 



