156 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 12$ 



the anterior and posterior arm, can be seen several long, simple spines ; 

 no rectal scales. Two ventral papillae on eighth segment well de- 

 veloped, pointed ; no sclerotized plaques. 



Types. — Holotype cf, and ? (U.S.N.M. No. 19996), in collection 

 of the United States National Museum ; reared from pupae collected 

 in a small tributary of the Comacho River, Empire, Canal Zone, 

 Panama, October 4, 191 3. 



SIMULIUM (LANEA) TRIVITTATUM Malloch 



Sinmlium trivittatum Malloch, U. S. Dept. Agr. Bur. Ent. Techn. Ser., No. 26, 

 p. 30, 1914 (original description, female). — Dyar and Shannon, Proc. 

 U. S. Nat. Mus., vol. 69, art. 10, pp. 37-38, figs. 78, 79, iiS, and 116, 1927 

 (c? and ? genitalia). — Vargas, Rev. Inst. Salubr. Enferm. Trop., vol. 4, 

 No. 4, figs. 19-26, 1943 {<S genitalia, posterior legs of c? and ?, and pupa). 



Simulinm (Lanea) trivittatum Malloch, Vargas, Martinez, and Diaz, Rev. 

 Inst. Salubr. Enferm. Trop., vol. 7, No. 3, pp. 169-170, fig. 127, 1946 (larva). 

 — Dalmat, Amer. Midi. Nat., vol. 52, No. i, pp. 17S-196, 1954 (presence in 

 Guatemala). 



Male (pi. 23, figs. 43-45). — The only male reared from pupae col- 

 lected in Guatemala was dissected prior to preparing a description of 

 the external characters. Therefore, a description can be given of only 

 the wings, legs, and genitalia since these were mounted on slides. 



Wings: 2.6 mm. long and 1.2 mm. wide; Sc pilose along basal 

 third ; Ri with hairs and spines on distal half, the spines more nu- 

 merous than the hairs ; R2+3 pilose except for short basal section ; 

 Cu2 arcuate; discal cell absent. 



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

 tibia yellow on basal half, brown on apical half ; tarsus dark brown 

 to black. Leg 2, length, 2.0 mm. ; coxa, trochanter, and femur yellow ; 

 basal half of tibia and basitarsus yellow, the apical half brown ; tarsal 

 segments 2-5 dark brown to black. Leg 3, length, 2.9 mm. ; coxa 

 brown ; trochanter yellow ; femur and tibia yellow with apical dark 

 ring; basitarsus yellow on basal two-thirds, black on apical third; 

 tarsal segments 2-5 black ; relation of basitarsus to second segment, 

 3.2 : I ; calcipala well developed, not reaching pedisulcus ; pedisulcus 

 well formed one-third the distance from the base of second tarsal 

 segment. 



Genitalia: Sidepiece (pi. 23, fig. 43) somewhat cylindrical in 

 shape, the apical margin shorter than the basal one, longer than wide ; 

 dorsal opening occupying somewhat more than half of dorsal surface 

 of sidepiece. Qasper (pi. 23, fig. 43) almost twice as long as it is 

 wide, apex wider than base; outer apical angle rounded, the inner 

 apical angle pointed, somewhat prolonged, with a single terminal 



