Saw-flies 17 G 



ocelli; the ocellar furrow broad and shallow, connected with the antennal 

 furrows; interocellar furrow represented by a triangular punctiform depression 

 connected with the antennal furrows, but distinctly separated from the median 

 ocellus; the ocellar areas convex, continued as slightly elevated ridges to the 

 frontal crest; the frontal crest deeply and broadly interrupted, forming a 

 curved strongly elevated ridge on each side continuous with the broad slightly 

 convex supraclypeal area; median fovea continuous with the broad furrow 

 interrupting the frontal crest, this furrow continuous with the well marked 

 ocellar basin, which extends to and around the median ocellus; the antennae 

 with the third and fourth segments subequal; the pronotum, the median lobe 

 and the cephalic part of the lateral lobes of the mesonotum, the mesoscutellum 

 the mesopostscutellum, the metascutum, and the metapleura finely densely 

 roughened; the lateral lobes of the mesonotum in great part finely granular 

 or polished with a few punctures; the mesosternum and metapleura finely 

 granular and polished; wings greatly abbreviated, not extending beyond the 

 caudal end of the abdomen, the stigma and costa pale, the veins much darker; 

 the claws deeply cleft, the inner rays shorter and blunter than the outer; the 

 abdomen polished with sparsely distributed punctures in which setae are attached; 

 the saw-guides broad and stout, the dorsal and ventral margins converging, the 

 distal end long, straight, and oblique on the ventral portion and the much 

 shorter dorsal portion bluntly truncated; the ventral and distal margins se- 

 taceous; the cerci long, slender, and pointed; colour blapk with the following 

 parts brownish : a spot on the frontal crest and ventral part of the ocellar basin, 

 the inner, posterior, and outer orbits, the postocellar area, the collar narrowly, 

 the tegulae, the median lobe and the caudal half of each lateral lobe of the 

 mesonotum, the cephalic half of the mesoscutellum, a large triangular spot on 

 the mesopleura, and the caudal end of the abdomen more or less; the knees 

 and the tibiae of the prothoracic and mesothoracic legs infuscated whitish. 

 Length, 6 mm. 



Barter island, Alaskan Arctic coast, June 16, 1914. D. Jenness, collector. 

 Specimen No. 866. 



This species is related to digestus from which it can be separated by the 

 characters given in the table. 



Amauronematus magnus, n. sp. 



FEMALE. Head densely finely punctured throughout, probably densely 

 setaceous, though the setae are in great part wanting on the specimen;' clypeus 

 deeply, broadly, angularly emarginate, the N clypeal lobes large and bluntly 

 angular; labrum large and truncate; the antennal furrows deep between the 

 pretentorinae and the frontal crest and lateral ocelli, deep linear furrows caudad 

 of the lateral ocelli, not interrupting the caudal margin of the head; the ocellar 

 furrow broad and indefinite; the interocellar furrow distinct, a rounded 

 depression where it joins the ocellar furrow; the portion of the ocellar areas 

 bearing the lateral ocelli sharply raised, in great part elevated; the frontal crest 

 a sharp V-shaped elevation, deeply interrupted on the meson by a broad, deep, 

 linear furrow continuous with the median fovea; the median fovea a large, 

 deep, punctiform depression; the ocellar basin convex with a distinct linear 

 furrow extending from the median ocellus to the frontal crest, not connected 

 with the furrow interrupting it; the supraclypeal area prominent and convex; 

 the antennae wanting beyond the second segment; the pronotum, the median 

 lobe of the mesonotum, the greater part of its lateral lobes, the mesopleura, 

 the mesosternum, and the metapleura densely punctured and setaceous; the 

 caudal portion of the lateral lobes of the mesonotum, the mesoscutellum, the 

 mesopostscutellum, and the metascutum sparsely punctured and setaceous; the 



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