—154— 

 Say (= S. nigribarbis Big.). This species, however, as I identify it, is a true 



Si in /us. 



Sargus triinttatus Say is probably a Ptecticus. S. xanthopusWieA. is, [believe, 

 a synonym of 8. decorus Say. 



Macrosargus is a genus of doubtful value; some of Loew's species of Sargus 

 belong here. 



Exochostoma caloceps Big., as Osten-Sacken suggests, is probably an Odon- 

 tomyia. 



Chryeoehlora Lat. (Mexico) is placed by Brauer in a distinct group. 



Scoliopelta n. g. Head similar to that in lieris. Eyes broadly contiguous in 

 the male, pilose; ocellar tubercle prominent; face rather small, antennae situated a 

 little below the middle in profile, first two joints short, of nearly equal Length; third 

 joint moderately long, moderately thickened, and then uniformly attenuated to the 

 tip, composed of eight segments, without style, first segment longest, about as long as 

 the second joint, the following six joints very narrow and distinguishable only with 

 difficulty, terminal segment longer; palpi cylindrical, not abbreviated. Scutellum 

 nearly as broad as long, sub-triangular, with two larger, approximate spines at its tip, 

 and on each side two smaller ones. Abdomen much flattened, nearly circular in out 

 line, composed of seven segments, the last two small, the seventh scarcely distinguish- 

 able from above. Hypopygium small. Origin of the stem of the second and third 

 veins opposite the base of the discal cell; origin of the second vein before the anterior 

 cross-vein; the furcation of the third vein near the middle; discal cell with four post- 

 erior veins, the third abbreviated before reaching the margin, the first two nearly con- 

 tiguous at their origin; fifth posterior cell broadly contiguous at the base with the 

 discal cell. Legs a little more slender than in Beris. 



Differs from Beris in the broad short abdomen, the elongate palpi, 

 the presence of the third posterior vein, etc. From Aclina it differs in 

 the holoptic male, the shape of the abdomen, hind femora, etc. 



Scoliopelta luteipes, n. sp. ^. Length 7 mm. Black, legs luteous. Antennae 

 about two-thirds as long as the distance from their base to the ocelli. Dorsum of 

 thorax shining, with a deep green reflection, clothed with short orange-colored pile; 

 humeri and post-alar callosities obscurely luteous. Halteres yellow. Abdomen mod- 

 erately shining, with sparse, very short, black pile. Legs luteous, the knees broadly, 

 and the tarsi yellow. Wings brownish infuscated, darker in front, the stigma small; 

 veins, except toward the base of the wing, brown. 



Two specimens, collected in meadow-land, near the base of Mt. 

 Washington, in the early part of August. 



In the examination of my material I have observed a few general 

 characters that appear not to have been previously described. I offer 

 some of them here as merely suggestive. 



In all the genera of Stratiomyidae known to me, except Subula, 

 species of Beris, Scoliopelta, Ptecticus and Pachygaster, the second longi- 

 tudinal vein takes its origin from beyond the anterior cross-vein. Its 

 origin in the three species of Ptecticus, which I have examined, was un- 

 expected. 



In the Stratiomyidae, except the Beridinae (and Subula), the front 

 coxal openings are more widely separated, the coxae are shorter, the meso- 



