VOL. 1V. | A New Trypetid. 15 
all of its length. ‘The markings of the wings are nearly black, 
or brownish black. Halteres pale tawny, knob pale lemon yellow. 
Length (with abdomen curved under), hardly 3 mm.; of 
wing, 314 mm. 
It is quite probable that a separate genus will have to be 
created for this form, at some future time, based on the shape of | 
the wings, the bristly third vein, and the four bristles of the 
scutellum. 
Nore on HEXACHATA AMABILIS Lw. A single specimen of 
this most handsomely marked trypetid was taken with the” 
preceding at Chacaltianguis, December 31, on foliage of plants 
in the edge of the woods. The species of the family Trypetidee 
are remarkable for their handsome markings, but this species, 
while possessing no other colors than black, dilute brown, and 
two shades of yellow, is one of the most beautifully marked 
species of this beautifully marked family. 
The markings of the wing in this specimen are of a deep 
shining black. Loew does not mention the hyaline drop in 
proximal end of distal cell, or leaves it to be implied when he 
likens the pattern to that of 77. exzmza. According to Macquart’s 
figure of the latter (Dipt. Exot. Sup. 4, pl. 27, fig. 3), and 
allowing for the modification in Loew’s text, I would not call 
the pattern of 17. amadilis at all similar to that of HY. eximia. 
Loew’s description of the wing pattern agrees perfectly in nearly 
every detail with the present specimen. He described only the 
$. The present specimen isa 2. . 
‘he middle femora in this female specimen are hardly at all 
black, and the hind femora are only a little black on inside and 
outside, the rest being all yellow; there are two patches of black 
on pleurze below wing bases, these patches being separated by 
the longitudinal pleural vitta of sulphur yellow, the forward 
portion of the pleure dissolving into brownish fulvous. The 
head is pure deep lemon yellow, the eyes of a purplish red (in dry 
specimen); front about two-sevenths width of head, hardly 
narrowed anteriorly, with three black frontal bristles on each 
side directed forward and inward, two weaker ones behind on © 
each side directed backward and not inward, and a pair at each 
