NO. I BLACK FLIES OF GUATEMALA — DALMAT 9 1 



coxa, and trochanter dark brown ; femur dark brown, with very small 

 tan apical ring ; tibia dark brown with very small tan basal ring ; tarsus 

 dark brown ; basitarsus parallel-sided ; relation of basitarsus to second 

 segment, 4.7 : i ; calcipala small but well developed ; no pedisulcus ; 

 claw with heel developed into a spur and with a flat, tonguelike process 

 appearing to arise from the base of the spur ; inner face of claw with 

 transverse striations (pi. 35, fig. 269). 



Abdomen : Tergite very dark brown, densely covered with silvery 

 hairs ; pleurites black with some silvery hairs, each with group of very 

 long golden hairs that reach the fourth segment. Segment 2 black, 

 the anterior half gray-pruinose, with dense cover of silvery-white 

 hairs. All other segments black, the anterior margin of each tergite 

 brown, densely covered with silvery-white hairs. Sternites tan. 



Genitalia: Cercus (pi. 28, fig. 118) dome-shaped, its height twice 

 its length (width). Anal lobe (pi. 28, fig. 118) somewhat triangular 

 in shape, expanded ventrally, the dorsal limit pointed, its height equal 

 to twice its length (width). Genital rod (pi. 28. fig. 120) with small 

 buttonlike expansion at extreme base ; apical expansions of genital 

 fork like wide ribbon, with 2 basal angular extensions that are well 

 pigmented. Ovipositors (pi. 28, fig. 119) triangular in shape, the 

 inner borders parallel, terminating in right angle, the base somewhat 

 greater than the height. 



Pupa (pi. 36, fig. 276, and pi. 39, fig. 316). — Granulosity on entire 

 thorax ; 5 short, hairlike trichomes on either side of midline of thorax. 

 Dorsal surface of abdominal segments : Granulosity covering all seg- 

 ments; spines on segments 3 and 4 are anteriorly directed, those on 

 segments 6-9 are posteriorly directed ; segments 3 and 4 with 8 simple 

 spines in transverse row just before the posterior margin, divided in 

 two by a median separation; segment 6 with about 137 simple spines 

 in transverse band across the anterior margin, extending one- fourth 

 the way back, the band composed of 3 rows ; segments 7 and 8 each 

 with transverse band situated as on segment 6, the band composed of 

 only 2 rows, segment 7 with about 104 spines and segment 8 with 100 

 spines; segment 9 with single transverse row of 34 simple spines 

 across the anterior margin, with median separation. Ventral surface 

 of abdominal segments : Entire ventral surface of all segments with 

 granulosity ; all spines are anteriorly directed ; segments 3 and 4 each 

 with 10 simple spines in transverse row three- fourths the distance 

 from the anterior margin, the spines evenly spaced, without median 

 separation ; segments 5-7 each with 10 simple spines, larger than on 

 segments 3 and 4, arranged in transverse row across the posterior 

 margin, the spines evenly spaced, without wider median separation ; on 



