344 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



the face from the middle. Antennse yellowish-brown ; first joint brown ; 

 arista 2-jointed, but first joint extremely small. Thorax pale yellow; 

 a double brown stripe in the middle, abbreviated behind; a lateral brown 

 stripe on each side, abbreviated in front and interrupted at the suture • 

 a humeral brown dot; a pleural, irregular brown stripe, running from 

 the neck to the root of halteres ; a pectoral brown spot below it. Scu- 

 tellura yellow ; metathorax brown, with a yellow line in the middle 

 Abdomen brownish-yellow, more brown on the sides, narrow, almost, 

 linear. Ovipositor about two-thirds of the abdomen in length, brown- 

 ish-yellow, with brown margins ; it is of nearly equal breadth, the tip 

 being broad and bluntly truncate ; on its anterior portion, on both 

 sides, there are shallow depressions, with slightly projecting corners 

 under them. Feet brownish-yellow ; femora tipped with black ; tibise 

 with brown rings a little beyond the middle, which are pale on tbe four 

 anterior and more distinct on the hind tibi?e. Wings pale brown? 

 densely mottled with pale dots; a short brown band connects the small 

 cross- vein with the costa; posterior cross-vein more oblique than in P. 

 valida Harris, and last section of fourth vein much less arcuated. 

 Sal). — Bee Springs, Kentucky (F. G. Sanborn). Two females. 

 This species is very like P. valida Harris in its general appearance, 

 but much smaller; head and feet have a different coloring, the oviposi- 

 tor a totally different structure, the posterior cross-vein a diiferent posi- 

 tion, etc. It cannot well be Oxycephala maculipennis Macquart, which 

 is larger, etc. 



Family TRYPETID^. 



Trypeta (OEdicarena) persuasa n. sp., ^. — Wings like Mono- 

 graphs, etc., iii, tab. xi, f. 15, except that the infuscated border of the apex 

 is prolonged along the anterior margin, so as to come in contact with the 

 cross-band at the end of the second longitudinal vein. The brown spot 

 on the pointed end of the anal cell is ranch larger ; the basal portion of 

 the wing, including the costal cell, but excluding the hyaline inside of 

 the second basal cell, is yellow. Head yellow ; front bright gamboge- 

 yellow, with a silky reflection. Antennae reddish-yellow; arista yel- 

 lowish at base; frontal bristles black. Thorax reddish-yellow, with a 

 grayish pollen, somewhat concealing two indistinct longitudinal brown, 

 ish stripes, expanded anteriorly, and bearing two darker spots poste- 

 riorly ; a large black spot on each side between the root of the wings 

 and the scutellum ; two smaller black spots at the base of the scutel. 

 lum. Halteres yellow. Abdomen ferruginous-red, with a slight gray, 

 jsh-yellow ]3olleu clothed with recumbent black pile; no longer bristles. 

 Legs reddish-yellow. Length about 6""^. 



Hab. — Denver, Colo. (P. K. Uhler and A. S. Packard, in July). Two 

 male specimens. The description of the thorax was drawn from Mr. 

 Uhler's specimen ; on the other, the stripes and spots upon it were much 

 less visible. 



Observation. — This species is most closely allied to T. tetanops Loew 



