NO. I BLACK FLIES OF GUATEMALA — DALMAT 237 



basal half of basitarsus light brown, apical half black ; tarsal segments 

 2-5 black. Leg 3, length, 4.0 mm. ; coxa and trochanter dark brown ; 

 femur black ; tibia tan on basal half, black on apical half ; basal half 

 of basitarsus and basal fourth of second tarsal segment tan, the re- 

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

 relation of basitarsus to second segment, 5.5 : i ; calcipala well de- 

 veloped, overreaching the pedisulcus ; pedisulcus well formed one- 

 third the distance from the base of second segment ; claw with well- 

 developed heel and with strong subbasal tooth (pi. 35, fig. 247). 



Abdomen : Tergite of segment i dark brown, with short black 

 hairs; pleurites black, with long black hairs that reach the fourth 

 segment. Segment 2 brown on anterior half and black on posterior 

 half, with white prunosity on lateral regions. All other segments 

 black, segments 6-8 shiny, the others almost velvety ; all segments with 

 short black hairs. Sternites yellow to tan. 



Genitalia: Cercus (pi. 33, fig. 211) almost rectangular in shape, 

 its height almost twice the length (width), posterior angles rounded. 

 Anal lobe (pi. 33, fig. 211) somewhat triangular in shape, expanded 

 ventrally, the posterior ventral corner extending slightly under the 

 cercus. Genital rod (pi. 33, fig. 213) long, without basal dilatation; 

 apical expansions of arms of genital fork ribbonlike, somewhat tri- 

 angular in shape, the apical angle strongly tapered and pointed, the 

 outer basal angle heavily sclerotized and acute, the inner basal angle 

 hyaline, created only by median folding over of expansion. Ovipositor 

 (pi. 33, fig. 212) small, triangular in shape, the base slightly greater 

 than the length. 



Pupa (pi. 37, fig. 307, and pi. 39, fig. 347). — Granulosity on entire 

 thorax ; about 30 short, simple, spinelike trichomes on either side of 

 midline. Dorsal surface of abdominal segments : Dorsum of segments 

 I and 2 completely granulose, dorsum of segments 3 and 4 sparsely 

 granulose; spines on segments 2-4 are anteriorly directed, those on 

 segments 5-9 are posteriorly directed ; segment 2 with 8 simple spines 

 in transverse row about three-fourths the distance from the anterior 

 margin, the row divided in two by median space ; anterior to the outer- 

 most spine on either extremity of the row are 2 similar spines ; seg- 

 ments 3 and 4 each with 8 simple spines in transverse row three- 

 fourths the distance from the anterior margin, with median separation ; 

 segments 5 and 6 with comblike groups of spines covering the entire 

 dorsum ; segment 7 with 12 simple spines in uninterrupted row along 

 the anterior margin and with combs over entire dorsum ; segment 8 

 with 12-14 simple spines in transverse row along anterior margin, 

 with median separation, and with combs over entire dorsum ; segment 



