E. T. CRESSON, JR. 
57 
Description. — Meso-frontal triangle brown at vertex, becoming silvery 
anteriorly; vittae broad, velvety black (dorsal aspect), reaching little beyond 
base of antennae, leaving narrow orbital lines. Face golden yellow, some- 
times with dark stripes; lunule golden. Antennae brownish or black, with 
base of third joint paler. Mesonotum distinctly vittate; the median and 
intra-alar vittae more or less coalescing; the lateral one complete over suture. 
Mesopleura with distinct stripe. Abdominal bands very broad and attaining 
apices of segments medianly, giving the abdomen the appearance of being 
dark opaque brown, with a complete mesal stripe and apical angles of seg- 
ments two to five, gray or yellowish brown ; ventral lobes yellowish with a series 
of large brown dots. Tibiae annulated with black or brown; fore tarsi brown. 
Length. — 2.5 to 4 mm. 
Lectotype. — cT ; Managua, Nicaragua, (F. C. Baker), [U. S. 
N. M. No. 7805]. (Present selection.) Paratypes. — 1 cf ; topo- 
typical. 1 9 ; Granada, Nicaragua, [all U. S. N. M.]. 
Specimens Examined.—^ cf, 6 9 . 
Nicaragua: Managua, (F. C. Baker), 2 cf, [L^. S. N. M.]. Granada, 
(F. C. Baker), 1 9, [U. N. S. N. M.]. 
Costa Rica; Banana River, XI, 9, 1909, (sweeping at upper reservoir, 100 
ft. alt.), 1 cf, 1 9 . Cartago, V, 17, 1909, (along ditch), 1 cf , 1 9 ; V, 25, 
1909, (along ditch), 1 9 ; VII, 4, 1909, 1 cf , 1 9 ; V, 10, 1909, (sweeping over 
mud), 1 cf; VI, 21, 1909, (sweeping over mud), 1 cf ; II, 19, 1910, (sweeping 
over mud), 1 9 ■ Turrucares, XII, 22, 1909, (sweeping over mud), 2 cf . 
Variation. — The series examined show very little variation, 
and this is mostly in the extent of the pale coloration of the legs, 
the tibiae sometimes being almost entirely black. 
Synonymy . — No doubt Williston’s pulchrifrons is this species, 
although his types were not examined by me. It is strange 
that Dr. Williston overlooked Loew’s name and that ]\Ir. Coquil- 
lett did not recognize Williston’s species. 
Var. signata new variety 
This form can hardly be considered a distinct species, although 
in some respects one is inclined to treat it as such. I believe it 
to be a northern form of frontalis. 
Description. — Similar to frontalis but averaging smaller. In general it is 
more grayish than yellow. Palpi sometimes with bases dark. Antennae 
darker; the dark facial vittae more distinct and orbits silvery in contrast. 
The brown bases of abdominal segments not so broadly occupjdng the apices 
at the medial stripe. All tibiae black, or their bases and joints pale. Length. — 
2 to 2.5 mm. 
Holotype. — S'; Thalman, Georgia, April 28, 1911, [Cornell 
Coll.]. Paratypes. — 2 ci’', 4 9 ; topotypical. 
TR.\NS. -VM. ENT. SOC., XLIII. 
