NO. I BLACK FLIES OF GUATEMALA — DALMAT 147 



tarsus and tarsal segments 2 and 3 tan, the remainder black. Leg 3, 

 length, 2.5 mm.; coxa brown; trochanter yellow; femur with basal 

 fourth yellow, apex black, and median portion dark brown ; tibia with 

 basal half yellow, apical half dark brown ; basal three-fourths of basi- 

 tarsus and basal half of second segment yellow, the remainder of these 

 segments, as well as all of segments 3-5, black ; relation of basitarsus 

 to second segment, 4.8 : i ; calcipala well developed, almost reaching 

 the pedisulcus ; pedisulcus very deeply incised ; basal heel somewhat 

 developed, but without secondary spur or tooth (pi. 35, fig. 262). 



Abdomen : Tergite of segment i black, with white pruinosity and 

 several short yellow hairs ; the pleurites similarly colored and clothed, 

 with the addition of long tan hairs that reach the fourth segment. 

 Segment 2 dark brown with gray pruinosity. Segments 3-6 with wide 

 black median band, the sides gray-pruinose ; segments 7 and 8 with 

 short golden hairs. Sternites tan. 



Genitalia: Cercus (pi. 30, fig. 154) dome-shaped, somewhat 

 higher than long (wide), with few long, strong hairs and numerous 

 minute, scalelike hairs. Anal lobe (pi. 30, fig. 154) both high and 

 rather long (wide), with fingerlike prolongation that curves under the 

 cercus ; similar investiture to that of cercus. Genital rod (pi. 30, 

 fig. 156) with basal dilatation hardly noticeable; apical expansions of 

 arms of genital fork triangular in shape, the inner basal and apical 

 angles rounded and hyaline ; at middle of outer margin there is a very 

 heavily sclerotized and pigmented toothlike projection ; the heavily 

 pigmented patch extends from base of this projection across the ex- 

 pansion to its inner margin. Ovipositor (pi. 30, fig. 155) very small, 

 with heavily pigmented group of spines. 



Pupa (pi. 36, fig. 288, and pi. 39, fig. 328). — Granulosity very 

 sparse and poorly marked on thorax ; 2 bifid trichomes on either side 

 of midline. Dorsal surface of abdominal segments : No granulosity ; 

 spines on segments 2-4 are anteriorly directed, those on segments 7-9 

 are posteriorly directed ; segment 2 with 8 simple, hairlike spines in 

 transverse row, crossing the segment about three-fourths the distance 

 from anterior margin, the row divided in two by a median space ; 

 anterior to the outermost spine on either side of the row are 2 hairs, 

 the most anterior heavier ; segments 3 and 4 with 8 simple spines in 

 a transverse row somewhat in front of posterior margin, the row being 

 divided by median space ; segment 7 with 8-18 simple spines in trans- 

 verse row behind the anterior margin, with median separation ; seg- 

 ment 8 with 24-26 simple spines in an uninterrupted transverse row 

 one-fourth the distance from the anterior margin, and with comblike 

 groups of spines lateral to each end of the row ; segment 9 with 14 sim- 



