176 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



form of the clasper. In ardeni the femur is yellow with a black apical 

 ring; the tibia is yellow with dark rings near base and apex; in 

 yepocapense both femur and tibia are black, except for a small, yel- 

 low, basal region on each. The basitarsus of ardeni is yellow with 

 a very small darkened area at apex ; that of yepocapense has the 

 basal half yellow, the apical half black. In ardeni the clasper is 

 narrowed considerably near the apex and the terminal spine is at a 

 distance from the apex, while in yepocapense the clasper is broad at 

 the apex, and the spine is almost terminal. 



The female of ardeni most resembles 5". (D.) earlei Vargas, Marti- 

 nez, and Diaz insofar as they both have the mesonotum devoid of 

 white-pruinose longitudinal bands and both have Ri pilose on distal 

 half to three-fifths only. However, the mesonotum of earlei has the 

 base color light brown, and is clothed with silvery-white scalelike 

 hairs, these in groups of 2 and 3 near the anterior margin ; the mesono- 

 tum of ardeni has the base color dark reddish brown and is clothed 

 with golden-yellow scalelike hairs, these never appearing in groups. 

 The median space of the buccopharyngeal apparatus of earlei has 

 several wide, scalelike teeth, while that of ardeni is smooth, without 

 teeth. 



The pupa of ardeni is similar to those of pidverulentum Knab and 

 yepocapense Dalmat, but can be distinguished by the characteristic 

 ramification of the pupal filaments. The cocoon of ardeni is larger 

 than that of pidverulentum, and the collar of the cocoon is much 

 higher than that of yepocapense. 



Types. — Holotype (J*), on 7 slides, and allotype ($), on 6 sUdes, 

 in the collection of the United States National Museum; collected 

 from the Rio Tzunutz, San Pedro Carcha, Department of Alta Vera- 

 paz, Guatemala, November 16, 1944. Paratypes (i J*, 4 pupae, and 

 4 pupal exuvia) in the collection of Herbert T. Dalmat; collected 

 with the holotype and allotype. 



SIMULIUM (DYARELLA) EARLEI Vargas, Martinez, and Diaz 



Simulium (Dyarella) earlei Vargas, Martinez, and Diaz, Rev. Inst. Salubr. 

 Enferm. Trop., vol. 7, No. 3, pp. 1 18-120, 177-178, figs. 16-21, 1946 (original 

 description, c?, ?, pupa, and larva). — Dalmat, Ann. Ent. Soc. Amer., vol. 44, 

 No. I, pp. 54-57, 1 95 1 (presence in Guatemala). 



Male (pi. 24, figs. 52-54). — 4.0 mm. long. 



Head: Holoptic. Eyes light brown. Antenna 660 //, long, 11- 

 segmented, slightly tapering, the last segment rather blunt; segment 

 3=1+2=11 ; scape and pedicel brown, flagellum very dark brown. 

 Palpi dark reddish brown. Clypeus white-pruinose, with long black 

 hairs. 



