.NO. 1930. DESCRIPTIOXS OF NEW SAWFLIES—ROHWER. 225 



Silverton, Colorado, Throe females collected August 8, 1903, at an 

 altitude of 12,000 feet, (One type). Russell County, Colorado. 

 One female collected July 18 by H. S. Smith. Colorado. Mount 

 Ranier, Washington, two females collected by C. V. Piper. 



Type.—Csit. No. 14600, U.S.N.M. 



TENTHREDO (LABIDIA) ANOMUS, new species. 



Related to alieiiaius, but the sheath is obhquely rounded below, 

 and the postocellar area is without furrows laterally. 



Female. — Length 9 mm. Labrum very short ; clypeus finely granu- 

 lar, anterior margin deeply squarely emarginate, the lobes truncate; 

 supraclypeal and antennal foveas confluent; supraclypeal area gently 

 convex, very sparsely punctured; middle fovea deep, large; antennal 

 furrows indicated by broad shallow furrows; ocellar basin obsolete, 

 the area striato-granular; postocellar furrow obsolete; postocellar 

 area sculptured similar to the adjoining vertex, not defined laterally; 

 postocellar line slightly longer than. the ocelloccipital line; antennae 

 eight-jointed, the last three joints not sharply defined; scutum and 

 prescutum similarly punctured; scutellar lobe finely granular, with 

 large punctures interspread; stigma straight below, obhque apically; 

 sheath straight above, tapering from the pointed apex to the rather 

 broad base. Black; clypeus, labrum, mandibles (apices piceous), 

 spot on dorsal and ventral margins of pronotum, spot on scutellum, 

 metepisternum, line on propodeum, lateral spots on two basal ter- 

 gites, narrow apical margin of follo^ving tergites and sternites, four 

 anterior femora beneath, four anterior tibiss and tarsi (except dorsal 

 apices of tibise), posterior tibiae, except dorsal apices, huid tarsi more 

 or less yellowish-white; pubescence of head black, that of thorax 

 gray. Wings hyahne, slightly yellowish; venation dark brown, costa 

 and stigma yellowish. 



Colorado. One female from the C. F. Baker collection. 



Type.— Cat. No. 14601, U.S.N.M. 



Key to the Nearctic species of Lahidia. 



The following table is based on the females, as the male of only one species is known 

 through specimens. 



Ocellar basin distinct 1. 



Ocellar basin obsolete 4. 



1. Postocellar furrow obsolete; antennae seven-jointed; scutellum and propodeum 



black anomocerus. 



Postocellar furrow present; antennae eight-jointed; scutelliun and propodeum (in 

 part) yellow 2. 



2. Sheath obliquely rounded below; mesepistemum black; (hind femora black) 



subnigriceps. 

 Sheath subtruncate, rounded below; mesepistemum with a pale spot 3. 



48702°— Proc.N.M. vol.43— 12 15 



