74 



segments 8 and 9 ruddy brown and segment 10 paler, yellow brown; segments 

 2-4 with blackish posterior margins; a faint, brown, mediodorsal line, partially 

 geminate on the anterior segments; on the anterior margin of the first eight 

 segments are two small blackish subdorsal dots, frequently surrounded by 

 faint pale shades; the lateral margin of segments 8 and 9 is narrowly yellowish 

 bordered above by a faint blackish line and there are frequently slight blackish 

 markings in the spiracular area. Ventrally pale whitish yellow, posterior seg- 

 ments more opaque than the anterior ones which are shaded laterally slightly 

 with brownish; segments 4-7 with medioventral brown ganglionic blotches; 

 two small black dots on each side of the median line about the center of each 

 segment and a similar lateral one, slightly in advance of these in position; 

 forceps pale ochreous; setae whitish with distinct brown rings. Legs yellow, 

 shading into dirty white on the tibiae, the joints of which are marked with 

 blackish; claws black; there is frequently a dark dot at apex of femora. Wings 

 hyaline, costal veins slightly yellowish at base of primaries, otherwise all veins 

 colorless. 



Female. — Paler and more olivaceous in general coloring than the $ ; head 

 yellow with black dots in lower corners next the eyes and slight black markings 

 at bases of antennae and on vertical carina, vertex with central blackish 

 shading and with two ruddy spots each side of the median line, the inner one 

 often obscured by the dark shading; abdominal maculation much as in $ , the 

 mediodorsal line extending forward on to the rear portion of mesothorax. 

 Length of body 8 mm.; of fore wing 8-10 mm. 



Holotype. — $, Ottawa, Ontario, July 4 (C. H. Curran); No. 778, in the 

 Canadian National Collection, Ottawa. 



Allotype. — 9 > same data. 



Paratypes. — 1$, 19, same data; 1$, Hogs Back, Rideau River, Ontario, 

 June 22 (R. H. Osburn) ; 3 $ , Algonquin Park, Ontario, June 18 (J. McDun- 

 nough); 2 $, North Reading, Massachusetts, June 10 (C. W. Johnson); the 

 two last in the collection of the Boston Society of Natural History. 



Owing to the impossibility at the present time of satisfactorily 

 identifying a number of the described species in this germs, the 

 description of a new species is always attended with a certain 

 amount of risk; it seems, however, advisable to tie our Canadian 

 species definitely down to given names and work out the synonymy 

 at leisure. The present species falls into the same group as lutulenta 

 Clem., the types of which are before me. These types are in very 

 poor condition and hard to recognize but they all show a sprinkling 

 of black dots on legs and abdomen, lacking in temporalis, and the $ 

 besides being apparently more olivaceous in coloration, shows 

 slight genitalic differences, notably in the lack of a small tubercle 

 between the bases of the forceps; this feature seems quite char- 

 acteristic of the present species. The 9 also resembles the unique 

 9 type of lineata Clem., which, however, has a brown dorsal stripe 

 rather than a mere line and has further no ventral maculation; the 

 subanal plate shows a distinct angular excavation apically whilst 

 in temporalis this excavation is evenly rounded. The Massa- 

 chusetts specimens were labelled excrucians Walsh but my notes 

 on the genitalia of the specimens in the Museum of Comparative 

 Zoology at Cambridge, Massachusetts, seem to indicate a different 

 form. 



