VOL. IV.] A Nfzu Trypeiid. 1 5 



all of its length. The markings of the wings are nearly black, 

 or brownish black. Halteres pale tawny, knob pale lemon yellow. 



Ivcngth (with abdomen curved under), hardly 3 mm.; of 

 wing, 3^^ 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. 



Note on Hexach.^ta 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 Trypetid se 

 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 H. eximia. According to Macquart's 

 figure of the latter (Dipt. Exot. Sup, 4, pi. 27, fig. 3), and 

 allowing for the modification in Loew's text, I would not call 

 the pattern of H. amabilis at all similar to that of H. eximia. 

 Loew's description of the wing pattern agrees perfectly in nearly 

 every detail with the present specimen. He described only the 

 <j . The present specimen is a $ . 



The 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 pleurae below wing bases, these patches being separated by 

 the longitudinal pleural vitta of sulphur yellow, the forward 

 portion of the pleurae 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 p air at each 



