102 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 1 25 



scales, but a few bifid and trifid scales present between the anterior 

 and posterior arms of each side. Eighth segment with 2 ventral 

 papillae, the same color as the body, appearing like short, broad-based 

 cones, no sclerotized plaques. 



Types. — Pupa, in collection of J. Romeo de Leon, Guatemala City ; 

 collected from a stream in the high region called Maria Tecum, be- 

 tween Solola and Totonicapan, Guatemala, 1940. Plesiotypes, 2 J* J* 

 and 2 $$, in collection of Herbert T. Dalmat, were also collected in 

 the region of Maria Tecum. 



Genus GIGANTODAX Enderlein, 1925 

 GIGANTODAX AQUAMARENSIS (De Leon) 



Simtdium aquamarensis De Leon, Bol. Sanit. Guatemala, vol. 52, pp. 72-73, figs. 

 lo-ii, 1944 (original description, pupal respiratoi-y apparatus). 



Gigantodax aquamarensis (DeLeon), Dalmat, Ann. Ent. Soc. Amer., vol. 44, 

 No. I, pp. 50, 54, and 57, 1951 (salient characters are given that demonstrate 

 its membership in this genus; distribution in Guatemala). 



Male (pi. 22, figs. 10-12). — (First description of male.) 2.8 mm. 

 long. 



Head : Holoptic. Eyes reddish brown on the upper half, black be- 

 neath. Antenna 11 -segmented, very slightly tapering, last segment 

 blunt ; scape, pedicel, and basal part of first flagellar segment yellow, 

 the remainder brown. Palpi dark brown. Clypeus dark brown, gray- 

 pruinose, irregularly covered with yellow hairs. 



Thorax : Mesonotum rust brown, the prescutellar region gray- 

 pruinose ; short, narrow, yellow, scalelike hairs over entire mesonotum, 

 longer and more numerous around the periphery ; prescutellar region 

 with long, yellow, erect hairs. Humeral angles brown, with yellow 

 hairs. Scutellum shiny brown, darker along the midline, with very 

 long yellow hairs. Postnotum dark brown on anterior half, light on 

 posterior half, devoid of hairs. Pleura brown, with gray pruinosity. 

 Stem of halter brown, its apex somewhat darker; the knob brown. 

 Wings, 3.4 mm. long and 1.4 mm. wide ; relation of length of body to 

 wing, 1 : 1.2; Sc pilose along basal six-sevenths; Ri completely pilose, 

 with spines also on distal third ; R2+3 pilose along distal six-sevenths ; 

 Cua almost straight ; discal cell absent. 



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

 brown, its apex somewhat darker; tibia brown, basal three-fourths of 

 basitarsus light brown, the apical fourth, as well as all of segments 2-5, 

 dark brown. Leg 2, length, 2.6 mm. ; coxa dark brown ; trochanter 

 brown ; femur brown, with dark-brown apex ; tibia light brown on 

 basal three- fourths, dark on apical fourth ; basal half of basitarsus and 



