10 PROCEEDIlSrGS OP THE NATIONAL MUSEUM vol. 68 



TENTHREDELLA FAGI (Panzer) 



A female from Kudia River, Siberia, collected Jiil}^, 1923, by 

 T. D. A. Cockerell, runs to this species in Enslin's key and ajjcrees 

 with specimens determined by Enslin. 



TENTHREDELLA FULVA (Klugr) 



One female from Kudia River, Amagu, Siberia, collected August, 

 1923, by T. D. A. Cockerell, agrees well with Enslin's redescription 

 of this species. 



TENTHREDELLA FUSCOTERMINATA (Marlatt) 



Two females from Kongaus, Siberia, collected August, 1923, by 

 T. D. A. Cockerell, agree with the types. 



Enslin considers this to be a synonym of xanthotarsis (Cameron), 

 but judging from the original description by Cameron and the 

 redescription by Kirby the two forms may be separated by the 

 following characters : 

 Head below the antenuae puuetured ; pectus with a black spot ; hind femora 



with a black line xanthotarsis (Cameron). 



Head below the antennae not punctured; pectus and hind femora without 



black fuscoterminata (Marlatt). 



TENTHREDELLA LIVIDA, variety DUBIA (Strom) 



A female from Olga, Siberia, collected July 13, 1923, by T. D. A. 

 Cockerell agrees with European specimens determined by Enslin. 



TENTHREDELLA MESOMELAS (Linnaeus) 



A single female from Kudia River, Amagu, Siberia, collected July, 

 1923, by T. D. A. Cockerell agrees with a European specimen deter- 

 mined by R. Meyer, but the venter is darker than in other European 

 specimens. The venter is distinctly brownish. A single male from 

 same locality has the marking on the tergites narrower and front 

 legs without black. 



TENTHREDELLA COCKERELLI. new species 



This species is allied to goliath (Enslin) but differs from the de- 

 scription of that species in the absence of pale marks at the bases 

 of the antennae, in the infuscate apices of the wings, and black 

 sternites. 



Female. — Length, 14 mm. Head broad, the posterior orbits dis- 

 tinctly wider than the cephal-caudad diameter of the eye; anterior 

 margin of the labrum subacute ; the clypeus with a rather shallow, 

 arcuate emragination; supraclypeal area convex; frontal furrows 

 deep ; postocellar area completely defined by deep furrows, posterior 



