20 Mr. C. H. T. Townsend on Diptera 
A very distinct species, which approaches in structure 
P. angustipennis, Will. (Dipt. St. Vincent, p. 284), but the 
wings, while quite as narrow, are not so acutely pointed at 
tip. Brownish or greyish brown, the thorax clothed with a 
thick tuft of white hair. A smaller thick tuft of white hair 
at base of abdomen ; rest of abdomen with short hair, appearing 
brownish when viewed from above and white when viewed 
obliquely. Head with some blackish hair. Legs greyish 
brown. Wings nearly three times as long as greatest width, 
quite thickly clothed with white or yellowish-white hair, 
forming a thick fringe on border, which is of even and only 
moderate length on whole anterior border of wing, but grows 
gradually longer from tip to base on posterior margin, until 
at base it lacks but little of being as long as greatest width of 
wing. The hairs of this longest fringe are directed straight 
backward at a right angle to long axis of wing. Hight small 
black spots on margin of wing as follows:—One on front 
margin at extreme base ; two faint linear central ones on base 
of wing, indistinctly separated; a large elongate one opposite 
on inner margin; two smaller distinct ones opposite each 
other on margin, one on front, the other on hind margin a 
little beyond middle of wing; a somewhat less distinct one on 
extreme tip, and a still less distinct one on hind margin 
between the apical one and the middle hind-marginal one. 
The wing-spots are seen with the compound microscope to 
touch only the veins, the basal spots appearing as a basal 
fascia to the wing. Outline of the wing bilaterally sym- 
metrical, not elongate-pointed at tip, but the margins evenly 
curved on each side to meet in an acute angle, the curves of 
apical portion being nearly the same as those of basal portion. 
Antenne much longer than thorax, reaching to or beyond 
middle of abdomen, comparatively stout, thickly clothed with 
white hair. 
This species seems allied to the European P. albipennis, 
Zett., the description of which is strikingly similar in some 
points. But punctatella differs abundantly, not only in other 
characters but particularly in the spotted wings, the wings of 
albipennis being without spots. It may belong in the ald7- 
pennis group, as would seem to be indicated by the description 
of the latter in the characters of the elongate antenne, elongate 
wings, hair and fringe of wings, small size, and general 
coloration.x—I may mention here that I have identified 
P. albipunctata, Will., in specimens taken at Frontera, 
Tabasco. 
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