PROC. ENT. SOC. WASH., VOL. 20, NO. 4, APR., 1918 81 



2. Intercosta wanting; head and thorax metallic; posterior orbits as 



broad as cephalo-caudad diameter of eye. . .Aimonnnioclaiu* Holnver 

 Intercosta present; head and thorax not metallic; posterior orbits 

 only about two-thirds the cephalo-caudad diameter of eye, 



Mnnnclfiuix 1 I:ir1 ig 



3. Malar space very narrow, reduced to a line; intercosta wanting; 



longer calcarium of hind tibiae subequal with basitarsus: an- 

 tennae biramose in both sexes although the rami arc shorter in 

 the female . . . AY.sW//'M*// Rolnver 

 Malar si)acc broad usually nearly as broad as the width of mandible 

 at base; internist a present; longer calcarium of hind tibiae 

 much shorter than basitarsus; antennae biramose in male, ser- 

 rate in female 



4. Scutellum of the metathorax large, well developed, flat, densely 



covered with large punctures, its cephalo-caudad length equal 

 or longer than the cephalo-caudad length of the propodeum, 



l)i lirinn Sehrank 



Scutellum of the metathorax smaller, not so well developed dor- 

 sally, more or less vertical, without large punctures and its 

 cephalo-caudad length shorter than the propodeum, 



X<'n</i jiriou Rolnver 



Augomonoctenus, new genus. 

 Genotype. Augomonoctenus libocedrii Rohwer. 



Belongs to the Tenthredinid subfamily Diprioninae, and is 

 related to the genus Monoctenus Hartig from which it is readily 

 separated by the absence of the intercosta, metallic head and 

 thorax, and the much broader posterior orbits. Robust; anterior 

 margin of the clypeus emarginate; malar space distinct; mandibles' 

 extremely broad at the base; posterior orbits wider than the 

 cephalo-caudad diameter of the eye; eyes diverging below; an- 

 tennae, of the female, wanting but undoubtedly serrate; of the 

 male, with single rami from each joint as in Monoctenus; head 

 and thorax highly polished, metallic; wings as in Monoctnuix, 

 except the intercosta is wanting; longer calcarium of the poslc- 

 rioe tibiae much shorter than the basit arsis; tarsal claws with an 

 erect inner tooth; sheath without brush-like plates at the apex; 

 last sternite of the female rounded posteriorly. 



Augomonoctenus libocedrii, new species. 



Female. Length 9 mm. Anterior margin of the clypeus subsqiiarely 

 emarginate; the emarginat ion in outline and size approximately tin 1 

 same as the lobes; snprad vpcal area convex, sharply separated from 

 the clypeus by a suture; middle fovea deep, elongate, and extending 

 to the anterior ocellus; antcnual furrows complete: postocellar furrow 



