NO. I BLACK FLIES OF GUATEMALA — DALMAT 89 



DESCRIPTIONS OF THE GUATEMALAN SPECIES 

 Genus CNEPHIA Enderlein, 1921 

 CNEPHIA AGUIRREI (Dalmat) 



Simiilium (Eusimulium) aguirrei Dalmat, Ann. Ent. Soc. Amer., vol. 42, No. 4, 

 PP- 544-548, figs. 10-18, 1949 (original description, $ and c? genitalia, pupa). 



Cnephia aguirrei Dalmat, Ann. Ent. Soc. Amer., vol. 44, No. i, pp. 48-50, 1951 

 (description of ? and pupa). 



Male (pi. 22, figs. 1-3). — (First description of external characters 

 of male.) 3.1 mm. long. 



Head: Holoptic. Eyes brown. Antenna 610 /* long, 11 -segmented, 

 segments 1-3 very long and slender; segment 3<i-|-2, 3>4+5' 

 3>ii ; scape and pedicel brown, the flagellum dark brown to black. 

 Palpi black. Clypeus black, white-priiinose, clothed with long black 

 hairs. 



Thorax : Mesonotum velvety black ; short black hairs over entire 

 mesonotum, some long black ones in prescutellar region. Humeral 

 angles dark brown, with short black hairs. Scutellum shiny dark 

 brown, with long black hairs. Postnotum velvety black, anterior half 

 white-pruinose, devoid of hairs. Pleura dark brown, with slight prui- 

 nosity. Stem of halter with black base and dark-brown apex, the knob 

 dark brown, partially black. Wings, 3.0 mm. long and 1.2 mm. wide; 

 relation of body length to wing, i : i ; Sc pilose along its basal third ; 

 Ri completely pilose, the basal half with several rows of hairs, the 

 distal half with spines as well as hairs ; R2+3 pilose except for minute 

 basal section ; Cu2 arcuate ; discal cell present. 



Legs : Leg i , length, 2.8 mm. ; coxa, trochanter, femur, and tibia 

 dark brown ; basitarsus and second segment light brown, remainder of 

 tarsus black. Leg 2, length, 2.8 mm. ; coxa black ; trochanter, femur, 

 and tibia dark brown ; basitarsus tan, second segment light brown, 

 segments 3-5 dark brown. Leg 3, length, 3.5 mm.; coxa and tro- 

 chanter black ; femur black with very small light-brown apical ring ; 

 tibia black with very small light-brown basal ring ; tarsus black ; basi- 

 tarsus spindle-shaped, its length equal to 3.1 times its width; relation 

 of basitarsus to second segment, 4.7 : i ; calcipala well developed but 

 small ; pedisulcus absent. 



Abdomen : Tergite of segment i black with short black hairs ; 

 pleurites black with very long tan hairs that reach the fifth or sixth 

 segment. Segment 2 black, the anterior half white-pruinose. Other 

 segments velvety dark brown to black, the posterior margins brown 

 with white pruinosity ; all segments with short dark-brown hairs, tufts 

 of longer hairs on pleura of segments 2-5. Sternites black, with white 

 pruinosity. 



