Il6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 125 



single segment ; segment 2 somewhat longer than segment i ; distinct 

 angle often present at articulation of segments 2 and 3 ; segment 2 

 with an indication of superficial segmentation near its middle; no 

 transverse striations or longitudinal wrinkles. Submentum with 9 

 triangular-shaped apical teeth, all very small, none very much longer 

 than the others ; ventrolateral row composed of 4 hairs in straight line, 

 the most-distal hair trifid or 4-branched near its tip ; at times there 

 are 2 small additional hairs near the base ; lateral margin of submen- 

 tum with 2 to 3 toothlike processes, the most-apical well sclerotized 

 and appearing to arise from the side of the outermost of the apical 

 teeth. Occipital cleft very deep and wide, almost circular in appearance 

 (pi. 42, fig. 398). 



Thorax and Abdomen : Pseudopod (thoracic proleg) with 28-30 

 rows of hooks on its apex ; postclypeal sclerites very minute, usually 

 absent. Posterior sucker with 68-72 rows of hooks. Each of the three 

 main divisions of the anal gills with 2-5 projections, forming a hand- 

 like structure. Posterior arms of X-shaped sclerite well sclerotized ; 

 anterior arms well sclerotized, each with narrow pigmented patch 

 along entire outer margin ; about 8 rows of rectal scales, each scale 

 well developed, mainly single, some double, directed anteriorly ; rectal 

 scales forming dark band across the segment. Eighth segment without 

 ventral papillae or sclerotized plaques. 



Types. — $, probably in the Museum of Paris; collected at Alto 

 Sarare, Venezuela, 1899. In the British Museum (Natural History) 

 there is a single specimen that was determined by Roubaud, and in 

 the United States National Museum there are four $5 from Sarare, 

 Venezuela, that had been examined by Roubaud. 



SIMULIUM (EUSIMTJLIUM) AUREUM (FRIES) 



S'nnulia aureus Fries, Monographia Simuliaruni sveciae, Lundae, vol. i, No. 5, 

 p. 16, 1824 (original description). 



Simulium bracteatmn Coquillett, Malloch, U. S. Dept. Agr. Bur. Ent. Techn. 

 Ser., No. 26, p. 15, 38-39, 1914 (redescription of Coquillett's species; % c?, 

 and pupa). — Jobbins-Pomeroy, U. S. Dept. Agr. Bull. 329 (Prof. Pap.), pp. 

 13-14, pi. 2, fig. 4; pi. 3, fig. 7; pi. 4, fig. 7; pi. 5, fig. 3; and text figs. 3, 4, 

 and 6, 1916 (larva, figs, of <S genitalia, larva [rectal gills, antenna, sub- 

 mentum, and row of hooks of posterior sucker], and pupa). 



Eusiinulium aureum (Fries), Dyar and Shannon, Proc. U. S. Nat. Mus., 

 vol. 69, art. 10, pp. 12-15, 48, figs. 24-26, 44, 1927 (? and c? genitalia; also de- 

 scribed under Eusimulium aureiim bracteatmn and Eusiinulium bracteatum) . 



Simulium {Eusimulium) aureum (Fries), Twinn, Canadian Journ. Res., sect. D, 

 vol. 14, pp. 115-117, figs. 6A, 1-5, 1936 (?, (S, and pupa).— Vargas, Mar- 

 tinez, AND Diaz, Rev. Inst. Salubr. Enferm. Trop., vol. 7, No. 3, p. 166, 

 1946 (larva). 



