NO. I BLACK FLIES OF GUATEMALA — DALMAT 261 



claw with well-developed basal heel and with small submedian tooth 

 (pi. 35, fig. 254). 



Abdomen : Velvety black ; tergite of segment i and tergites and 

 pleurites of segments 2 and 6 gray-pruinose ; posterior margin of 

 pleurites of first segment with fringe of long black hairs which reach 

 the third segment; short black hairs sparsely covering all segments. 

 Sternites tan, with gray pruinosity. 



Genitalia: Cercus (pi. 34, fig. 226) quadrangular, higher than 

 long (wide), clothed with long, strong hairs and small spinelike hairs. 

 Anal lobe (pi. 34, fig. 226) irregularly quadrangular, somewhat 

 curved around the cercus, with a fingerlike extension projecting from 

 posterior ventral angle. Genital rod (pi. 34, fig. 228) with well- 

 marked basal dilatation ; entire rod well sclerotized ; apical expansions 

 of arms of genital fork triangular in shape and very slightly pig- 

 mented ; apical angle very blunt and broad, the outer basal angle 

 pointed and sclerotized. Ovipositor (pi. 34, fig, 227) subtriangular 

 in shape, its height equal to the base ; apex rounded. 



Pupa (pi. 38, fig. 312, and pi. 39, fig. 352). — Granulosity on entire 

 thorax ; 4 simple, heavy, spinelike trichomes on either side of midline. 

 Dorsal surface of abdominal segments : No granulosity ; spines on seg- 

 ments 2-4 are anteriorly directed, those on segments 6-9 are poste- 

 riorly directed ; segment 2 with 8 simple spines in a transverse row 

 across middle of segment, the row being separated in two by a median 

 space ; anterior to the outermost spine on either end of the row are 2 

 hairs ; segments 3 and 4 each with 8 simple spines in a transverse row, 

 situated somewhat before the posterior margin, each row also being 

 divided into two by a median space ; segment 7 with band composed 

 of 12 groups of blunt spines crossing somewhat behind the anterior 

 margin, each of the spines with from i to 8 denticles on its apex, these 

 being longer than the usual comblike spines ; band separated by median 

 space ; segment 8 with uninterrupted band along anterior margin com- 

 posed of 12-14 blunt spines, each with from i to 6 denticles at its apex ; 

 lateral to each end of the band are 10-12 comblike groups, each with 

 from 1-6 spines ; segment 9 with band of comblike groups across its 

 anterior margin, each group composed of 1-2 spines, with median 

 separation. Ventral surface of abdominal segments : No granulosity ; 

 all spines are anteriorly directed ; segment 5 with 4 simple spines in 

 transverse row before the posterior margin, the row being divided by 

 a median space ; segments 6 and 7 with similar rows of simple spines, 

 but with the two spines on either side of midline more separated than 

 on segment 5, the distance between them being approximately equal 

 to that of the median space. Terminal spines absent. 



