266 Journal New York Entomological Society. t Vo1 - xxvii. 



present ; four or more pairs of posterior dorsocentrals : vestiture of fourth 

 ventral plate short and reclinate (not decumbent) ; posterior portion of fourth 

 notum dull orange, this color extending more forward dorsally ; second ab- 

 dominal segment without marginals: second genital segment dull orange; in 

 profile each forceps prong truncated at end and anterior corner pointed and 

 slightly produced. 

 Length n min. 



Head. — Parafrontals, genae and transverse impression dark, with silvery 

 tinge when viewed from above. Breadth of front at narrowest part one third 

 eye width ; cheek height one third that of eye. Front prominent ; at its nar- 

 rowest part frontal vitta three to four times width of each parafrontal, its 

 sides not parallel. Second antennal segment dark; third about twice length of 

 second ; arista short plumose on proximal half. Three rows of black cilia be- 

 hind eyes, vestiture of lower portion of metacephalon black. Cheek vestiture 

 black and coarse. Gena with irregularly placed bristles near lower orbit above 

 transverse impression, elsewhere with short, scattered cilia. Palpi dark. 



Chaetotaxy. — Lateral verticals absent; vibrissas inserted very slightly above 

 line or oral margin ; each row of frontals extends to base of vitta and lower 

 ends widely divergent with one or two bristles in angles formed by sides of 

 vitta and diverging ends of the rows. 



Thorax. — Mesonotum clothed with long slightly reclinate bristles or bristle- 

 like hairs. Epaulets black. 



Wings. — Bend of fourth vein slightly more than a right angle; anterior 

 cross-vein more basal than end of first longitudinal ; third vein with bristles, 

 also with scattered bristles beneath (probably variable) ; anterior basal cross- 

 vein making a distinct right angle with fourth longitudinal (possibly variable) ; 

 costal spine vestigial, section III of costa longer than section V ; calypters 

 whitish with tuft of dark hairs at the fold. 



Legs. — Dark, vestiture short. Anterior face of posterior femur with three 

 rows of bristles, upper and lower rows complete, bristles of intermediate row 

 short and only present centrally ; posterior face with complete lower rows of 

 long bristles ; femur subcylindrical : tibia very slightly curved or straight : tar- 

 sus not shorter than tibia. Anterior and posterior ventral rows of bristles of 

 middle femur present, latter on distal two thirds, former complete: submeso- 

 tibial bristle absent. 



Chaetotaxy. — Anterior dorsocentrals scarcely weaker than anterior pairs of 

 postsuturals, much longer than vestiture of prescutum ; acrostichals absent; 

 inner presuturals present : four or more pairs of posterior dorsocentrals, last 

 two much the stronger ; prescutellar acrostichals present : scutellar apicals 

 present: three sternopleurals ; lower sternopleura with bristles and hairs. 



Abdomen. — Clothed above with short reclinate bristles, beneath with much 

 longer, almost erect hairs. Vestiture of fourth ventral plate short and reclinate 

 with longer, appressed marginal hairs. Posterior portion of fourth notum dull 

 orange, this color extending farthest forward dorsally. 



Chaetotaxy. — Second segment without dorsal marginal bristles ; third with 



