Vol. XI] MACGILLIVRAY— PRIBILOF ISLANDS SAW-FLIES 191 



minute tooth at middle ; abdomen polished, setaceous ; color black 

 elevated, pentagonal area identifiable, side walls not elevated, 

 rounded; ocellar basin broadly concave, with three slight eleva- 

 tions ; frontal crest short, not extending beyond antennal furrows, 

 not strongly elevated, almost wanting, not broken ; median fovea 

 broad shallow inconspicuous depression; antennae with fourth 

 segment longer than third, segments setiferous, roughened; 

 mesonotum and mesopostscutellum polished, bare, cephalic two- 

 thirds with shallow punctures; mesopleuron polished, sparsely 

 setiferous ; abdomen polished, sparsely setiferous with short seta ; 

 wings prominent, hyaline, costa and stigma pale, veins brownish ; 

 claws with a minute erect tooth at middle; body black with 

 distal third of femora, tibiae entirely, and tarsi brownish. 

 Length 6 mm. 



Female : The female differs in having median fovea shallower, 

 antennas and ocellar furrows not so distinct; mesonotum and 

 mesopostscutellum polished, not punctured; cerci extending to 

 ends of saw-guides, stout and setiferous ; saw-guides stout, dorsal 

 margin straight, ventral and distal margins continuous, oblique, 

 forming a point at distal end with dorsal margin; color black 

 with the following parts brownish: clypeus, labrum, mandibles, 

 tegulae, pronotum very narrowly, median lobe of mesonotum 

 except central black spot, mesopleurae, inconspicuous in great 

 part, distal ends of coxae, trochanters, distal ends of femora, 

 tibiae, and tarsi. Length 7 mm. 



Holotype, male, No. 826, Mus. Calif. Acad. Sci. ; collected 

 by G. Dallas Hanna, June 30, 1920. 



Type locality, St. George Island, Alaska. 



6. Pachynematus vernus MacGillivray, new species 



Male: Head not punctured, but irregularly roughened or 

 granular ; clypeus polished, deeply and roundly and very narrowly 

 emarginate, clypeal lobes sharply angularly pointed; labrum 

 polished, rounded ; antennal furrows broadly interrupted on mid- 

 dle of cephalic aspect, narrow and deep near pretentorinae, broad 

 and shallow near ocelli, then divergent to occiput ; ocellar furrow 

 wanting; ocellar area not elevated, sides flat, pentagonal area 

 slightly elevated as a whole and outline identifiable ; frontal crest 

 wanting; median fovea a broad shallow depression, longer than 

 broad, inconspicuous ; antennae with the fourth segment distinctly 

 longer than the third, roughened, densely setaceous ; median lobe 

 of mesonotum polished, cephalic two-thirds with broad shallow 

 punctures, lateral lobes and mesoscutellum not punctured or very 

 sparsely ; mesopleura polished, setaceous ; wings large, prominent, 

 stigma and costa pale, other veins brownish ; claws with a very 



