NO. I BLACK FLIES OF GUATEMALA DALMAT 179 



trochanter light brown ; femur and tibia brown ; basal two-thirds of 

 basitarsus and basal half of second segment light brown, remainder 

 of these segments, as well as all of segments 3-5, dark brown ; relation 

 of basitarsus to second tarsal segment, 5:1; calcipala well developed, 

 not reaching pedi sulcus ; pedisulcus well formed, situated one-half 

 distance from base of second segment; heel of claw developed into 

 secondary spur (pi. 35, fig. 238). 



Abdomen : Tergite of segment i brown, pleurites black, the latter 

 clothed with long tan hairs that reach the third segment. Tergite of 

 second segment brown, the pleurites black, with white pruinosity. 

 Segments 3-5 very dark brown to black, 6-9 lighter and shiny; 

 pleurites brown ; several long black hairs on last segment. Sternites 

 brown, becoming darker toward the terminal segments. 



Genitalia: Height of cercus (pi. 31, fig. 172) twice its length 

 (width), almost rectangular in shape, clothed with many long, heavy 

 hairs and with numerous fine, spinelike hairs. Anal lobe (pi. 31, 

 fig. 172) somewhat crescentlike, a large, membranous, very hairy 

 structure extending from it ventrally ; with similar investiture to that 

 of cercus. Genital rod (pi. 31, fig. 174) without basal dilatation, or, 

 at most, base very slightly expanded; apical expansions of arms of 

 genital fork somewhat triangular in form, the apex blunt, almost 

 squared ; apex and outer angle well sclerotized, the inner angle with a 

 hollow, conical spur extending from it ; union of both arms wide, the 

 inner border straight. Ovipositor (pi. 31, fig. 173) long, lance-shaped. 



Pupa (pi. 37, fig. 294, and pi. 39, fig. 334). — Entire dorsum of 

 thorax with granulosity ; 2 bifid and 3 trifid trichomes on each side of 

 midline of thorax. Dorsal surface of abdominal segments : Segment i 

 with granulosity on posterior margin ; segments 2 and 3 with it on 

 their anterior margin ; segment 2 with 6 anteriorly directed simple 

 spines in a transverse row across its middle, the row being separated 

 into two by a median space ; segments 3 and 4 with transverse rows, 

 somewhat before the posterior margins, composed of 8 spines, each 

 row also divided by median space ; lateral margins of segments 2>-7 

 each with a single, anteriorly directed spine. Ventral surface of ab- 

 dominal segments: Fifth segment with 4 anteriorly directed spines 

 in transverse row somewhat before the posterior margin, the spines 

 being divided into two equal groups by a median space; segments 6 

 and 7 with similar rows of spines, but the two spines on each side of 

 median space are more separated than on segment 5, so that the dis- 

 tance between them is approximately equal to that of the median 

 space. Terminal spines absent. 



Respiratory apparatus (pi. 37, fig. 294) of each side arising on 



