NO. I BLACK FLIES OF GUATEMALA — DALMAT 211 



three-fourths of femur brown, the apical fourth black ; basal and apical 

 fourths of tibia black, the median part brown ; tarsus black. Leg 2, 

 length, 2.3 mm. ; color patterns like on leg i with the exception of 

 the basitarsus which is brown on the basal half and black apically. 

 Leg 3, length, 2.8 mm. ; color patterns on coxa, trochanter, femur, and 

 tibia as on legs i and 2 ; basal two-thirds of basitarsus and basal half 

 of second segment tan, the remainder of these segments, as well as all 

 of segments 3-5, black ; relation of basitarsus to second segment, 

 5.4:1; calcipala well developed but small; pedisulcus very poorly 

 marked, hardly noticeable; claw with minute subbasal tooth (pi. 35, 



fig- 245)- 



Abdomen : Tergite and pleurites of segment i very dark brown, 

 the pleurites with long brown hairs that reach segment 4. Segment 2 

 with anterior half brown, the posterior half black. Segments 3 and 4 

 black, the others dark brown. All segments with short dark-brown 

 hairs. Sternites tan. 



Genitalia: Cercus (pi. 32, fig. 193) dome-shaped, its height more 

 than twice its length (width). Anal lobe (pi. 32, fig. 193) with the 

 anterior margin rounded, the posterior margin convex, its dorsal ex- 

 tremity tapered and its ventral portion, which extends well below the 

 cercus, quite expanded. Genital rod (pi. 32, fig. 195) with short, 

 somewhat triangular-shaped dilatation; apical expansions of arms of 

 genital fork narrow and elongate, the apex truncate and angular ; 2 

 triangular-shaped expansions near the base, one from the inner margin 

 and the other from the outer one outer expansion somewhat sclero- 

 tized on the margins. Ovipositor (pi. 32, fig. 194) small, somewhat 

 triangular in shape, the base greater than the length. 



Pupa (pi. 37, fig. 301, and pi. 39, fig. 341).— Granulosity on entire 

 thorax, concentrated in central region ; numerous (about 80) fine, 

 simple trichomes grouped together near the center of thorax in an 

 almost triangular patch. Dorsal surface of abdominal segments : Dor- 

 sum of segment i with very light granulosity throughout; spines on 

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

 teriorly directed ; segment 2 with 8 simple, hairlike spines in a trans- 

 verse row three-fourths the distance from the anterior margin, the 

 row divided by a median space ; anterior to the outermost spine on 

 both extremities of the row are 2 similar spines ; segments 3 and 4 

 each with a transverse row of 8 simple spines crossing at or near the 

 posterior margin, the row divided by a median space ; segment 7 with 

 20 simple and bifid spines in uninterrupted row somewhat behind the 

 anterior margin and with numerous comblike groups of spines dis- 

 tributed over entire surface ; segment 8 with 7-9 simple spines in an 



