506 PROCEEDINGS OF THE ACADEMY OF [Sept., 



vitreous spot before the stigma extending from cell 1st Ri into the 

 base of cell Mi. Venation as in other members of the hicornis group, 

 but the cell 1st M^ is large and less regularly pentagonal (see Plate 

 XVII, fig. 20). 



Abdominal tergites bright yellow; a narrow median brown vitta 

 beginning on the base of segment two extending through segment 

 six; segments seven and eight yellow, indistinctly brown medially; 

 the ninth tergite is dark brown, pale medially on the caudal half 

 above; an indistinct sublateral band beginning midlength of the 

 second segment, ending on the seventh segment, on the last three 

 segments oblique; lateral margins broadly, caudal margins narrowly 

 yellowish silvery; sternites dull yellow, narrowly margined with 

 silvery; ninth pleurite and sternite dark brown. Male hypopygium 

 (see Plate XVIII, fig. 40) with the ninth tergite (see Plate XIX, 

 fig. 58) tumid, though not very high, the caudal margin almost 

 transverse with an indistinct median impression; no horns or lobes 

 on the tergite; the ventro-caudal margin on either side of the middle 

 line is produced into a flattened edge whose ipner angle is blackened, 

 chitinized, and sparsely denticulate. Ninth pleurite complete, 

 extensive; the caudal margin is produced into a broad, flattened 

 process directed caudad and slightly dorsad and entad; outer pleural 

 appendage small but prominent for this group, of species, elongate-, 

 cylindrical, pale with a few scattered long hairs; inner pleural 

 appendage a flattened blade which is broad basally, narrowed into 

 a subacute point, the caudal margin ciliate with long yellow hairs. 

 Ninth sternite extensive, the dorso-caudal angle produced entad 

 and slightly ventrad; this process subacute and slightly chitinized; 

 beneath this a shorter lobe with a fringe of long yellow hairs, those 

 at the distal end curled and twisted. The gonapophyses are very 

 long, subequal to the penis-guard which they subtend; the tips of 

 the gonapophyses slightly divaricate, the distal two-thirds with a 

 fringe of stout yellow hairs on the ventral face. Eighth sternite 

 extensive, the caudal margin subtransverse with four slight tubercles, 

 each bearing a dense tuft of long yellow hairs; the lateral brushes 

 surround a powerful decussate reddish bristle. 



Habitat. — Northeastern United States. 



Holotype, cf, Dummerston, Vermont; July 14, 1908 (Johnson). 



The type is in the collection of the Boston Society of Natural 

 History. 



The species is dedicated very respectfully to Mr. Charles W. John- 

 son, the collector of the type specimen. 



