A NEW TRYPETID FROM CHACALTIANGUIS, MEXICO, 

 WITH A NOTE ON HEXACH^TA AMABIEIS EW. 



BY C. H. TYLER TOWNSEND. 



The following trypetid was collected by the writer, December 

 31, 1892, at Chacaltiauguis, a river town about seventy-two 

 Mexican miles up the Papaloapam River from Tlacotalpam. It 

 was taken with other diptera and various insects, by sweeping 

 the undergrowth in the edge of the woods back of the town. 



This trypetid belongs, by the markings of its wings, in the 

 genus Euaresta. It has four bristles on the scutellum, which 

 does not, however, preclude it from this genus, as some of the 

 species placed here by Eoew also possess four scutellar bristles. 

 But the shape of the wings is distinctly diiBferent from that of 

 the wings of Euaresta. They are very broad on the median 

 one-half of their length, then slightly taper to a blunt apex. 

 I shall leave the form for the present, however, in Euaresta. 

 The species is very similar to E. Mexicana Wd. and E. melano- 

 ^aslra Lw. (syn. of preceding ?) but differs from both in having 

 four bristles on the scutellum; and it also differs from all the 

 species of Euaresta in another character which must be men- 

 tioned, and which was considered by Eoew of generic importance, 

 that of the third longitudinal vein being bristly almost to its 

 termination. 



Euaresta latipennis nov. sp. $ . 



Front more than one-third width of head posteriorly, evenly 

 narrowed to about one-third width of head at base of antennae, 

 pale silvery on borders, the rest being taken up with the wide, 

 very dilute tawny frontal vitta, which also has a silvery reflection. 

 Antennae very dilute tawny, third joint about one and one-half 

 times as long as second, second joint with a small bristle 

 anteriorly and sparsely clothed with minute bristles; arista 

 thickened basally, where it is concolorous with antennae, and 

 shows a basal joint, blackish on remaining portion. Eyes (in 

 dry specimen) dark green, or dull purple, according to change of 

 light. Frontal bristles five in number on each side, not including 

 the long posteriorly directed pair on vertex; of these the anterior 



