102 C. H. TYLER TOWNS END. 



exteiuling to scutellum ; soutellum cinereous, discal portion darker, humeri and 

 pleurae silvery. Abdomen blackish, more or less faintly shaded with silvery, 

 anal segment entirely rufous, first and second segments with a median marginal 

 pair and several lateral and ventral mai-ginal macrochsetfe ; third and fourth 

 segments with a marginal row of macrochsetfe. Legs black, femora and tibia 

 more or less silvery on outer surface; claws and pulvilli elongate, the pulvilli 

 fuscous. Wings grayish hyaline, tegulfe nearly white, halteres pale tawny. 

 Length of body 8 mm. ; of wing 64 mm. 



Described from one specimen ; Las Graces, N. Mex., May 30th. 



TRIXOCXISTA u. gen. 



Moderately large, rather elongate, cinereous species, having much 

 the facies of Sarcophagidte, and with some of the characteristics of 

 Trixa. Belongs in Tachininse. Head somewhat irregularly quad- 

 rilateral in profile, the facial profile less than one-half the occipital ; 

 front rather prominent, about one-sixth width of head on vertical 

 half in S , three times as wide at base of antennae, face widening to 

 four-fiftiis width of head or more below; frontal bristles compara- 

 tively weak, all about equal, in a single row, not descending below 

 base of antennae, interspersed with shorter bristles which cover the 

 whole sides of front anteriorly; vertical and next bristle directed 

 weakly backward, rest inward; no orbital bristles ( S ). Face per- 

 pendicular, epistoma not prominent (the facial ridges seen in profile 

 are concave, and the vibrissal angles swollen or prominent); facial 

 depression not much more than one-third width of face, shortened, 

 somewhat oval in outline, shallow, with a median longitudinal swell; 

 facial ridges bristly not more than one-third way up, well constricted 

 above oral margin; sides of face very wide, rather short, clothed 

 with bristles disposed in four longitudinal rows, obliquely cut oflf 

 below; cheeks very wide, more than one-half eye-hight, bare ante- 

 riorly on furrowed portion, bristly behind with bristles on lower 

 border; vibrissse strongly decussate, in.serted well above oral margin. 

 Eyes bare, descending obliquely about two-thirds way to oral mar- 

 gin. Antennse inserted about on line drawn through middle of eyes, 

 short, extending little more than half way to oral margin, first joint 

 short, second a little elongate, third one and one-half times as long 

 as second, straight on front edge, rounded posteriorly ; arista rather 

 long, short pubescent on thickened basal fourth, distinctly 3-jointed, 

 second joint a little longer than wide. Proboscis short, not much 

 over one-half hight of head, fleshy, labella well developed; palpi as 

 long as proboscis below geniculation, reaching epistoma, rather 



