208 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL, 12$ 



General color somewhat orange, with no dark patches on ventrolateral 

 parts of segments 6 and 7. 



Head: Designs on frons-clypeus and epicranial plates shown on 

 plate 41, figure 378. Each cephalic fan with 46 pectinate branches, 

 the hairs on these branches being exceptionally short, shorter than 

 those of any other representatives of this subgenus, interspersed at 

 intervals with somewhat longer and stouter hairs ; all hairs simple. 

 Mandible with a single, well-formed, sharp tooth on its inner margin, 

 a sign of another more basal minute tooth also visible. Antenna 480 /i 

 long, light yellow, 4-segmented, far surpassing the basal stalk of the 

 cephalic fan; segment 2>i>3; segment 2 with 3 clear patches, each 

 with a superficial indentation causing the segment to appear divided 

 into 7 parts ; segment 4 with white band in middle ; segment i with 

 longitudinal striations. Submentum with 9 triangular-shaped apical 

 teeth, the central one longer than the others ; ventrolateral row com- 

 posed of 9 hairs in a straight line, all appearing bifid or trifid except 

 the most basal, which is simple ; lateral margin of submentum with 

 3-4 toothlike indentations near apex. Occipital cleft with apex dome- 

 shaped, rounded (pi. 42, fig. 415). 



Thorax and Abdomen : Pseudopod (thoracic proleg) with 48 

 rows of hooks at its apex ; postclypeal sclerites small, well sclerotized, 

 one at each posterior junction of the frons-clypeus with an epicranial 

 plate. Posterior sucker with 220-222 rows of hooks. Anal gills with 3 

 main branches, each with a somewhat bulbous base, less so than in 

 rubicundiilum; each branch with 11 fingerlike projections that are long 

 and slender. The X-shaped sclerite well sclerotized, the posterior arms 

 reaching the sides of the larva ; apices of anterior arms somewhat ex- 

 panded ; no rectal scales or spines, or pigmented patches ; no ventral 

 papillae or plaques on eighth segment. 



Types. — Holotype ($), on 7 slides; allotype (J*), on 5 slides; and 

 2 paratypes (i J*, i 5), mounted on pins, in the collection of the 

 United States National Museum. Holotype collected from the Rio 

 Sacaya, Finca Niagara, San Pedro Yepocapa, Department of Chimal- 

 tenango, Guatemala, October 4, 1948, and allotype collected from the 

 Rio Kikiya, Finca El Naranjo, Acatenango, Chimaltenango, Au- 

 gust 12, 1948. Other paratypes (9 $$, 3 (^J*) in the collection of 

 Herbert T. Dalmat. 



SIMULIUM (SIMULIUM) JACUMBAE Dyar and Shannon 



Simnliiim jacumbae Dyar and Shannon, Proc. U. S. Nat. Mus., vol. 69, art. 10, 

 pp. 25, 44-45, figs. I13-114, 1927 (original description, c? genitalia). 



Simiilhim (Simuliuni) jacumbae Dyar and Shannon, Vargas, Martinez, and 

 Diaz, Rev. Inst. Salubr. Enferm. Trop., vol. 7, No. 3, PP- 146-147 and 174, 



