Tenthredinidae 893 



A. luteotergus (Nort.). Keene Val, Dyar (US) ; Ithaca, May (MacG-Ill). Larva 

 feeds on foliage of Alnus. 



A. nigrofemoratus (Cress.)- Ithaca, May (CU). This is an unusual record and 

 may be based on an erroneous determination. 



A. oregonensis Marl. Keene Val. (Dyar). Larva feeds on foliage of "woolly 



willow." 

 A. rapax (Cress.). Ithaca, Ap (MacG-IU). This species was previously reported 



only from Nevada. 



A, similis Marl. Plattsburg and Keene Val., Dyar. Larva feeds on foliage of 

 "woolly willow." 



Croesus Leach 127 



C. latitarsis (Nort.). Plattsburg (Dyar); Ithaca, Aug (CU) ; Glen, Jl (CU). 

 Larvae feed gregariously on foliage of birch. 



Nematinus Rohwer 



{Nematus Konow and auctt.) 



N. chloreus (Nort.). LI: Bellport, Je 5, 1897, Dyar (US). Larva feeds on foliage 



of black oak. 

 N. unicolor (Dyar). Keene Val., type. Larva feeds on white birch. 



Nematus Panzer 128 



{Holconemc Konow) 



N. erichsonii Hartig. Larch Sawfly. New Russia, Je (NYS) ; Alder Cr., Je 

 (NYS) ; Horicon, Pottersville, Schroon L., DeKalb Jet., Cherry Val., Newton's 

 Corners to Sageville, St. Lawrence Co, Wilmington Notch to Mountain View 

 House in Essex Co (Felt) ; Crosby, Je (NYS) ; Ithaca, Ap-Jl (CU, MacG- 

 111) ; Ballston Spa (Felt) ; Albany, May- Aug (Felt). Larvae feed on foliage 

 of larch, and are often an important pest. 



N. suratus Fitch. "NY", type. Larva is recorded as feeding on cherry. This 

 species has not been examined since it was originally described, and very prob- 

 ably does not belong to the genus Nematus as at present restricted. 



Pachynematus Konow 



P. aurantiacus Marl. McLean (CU). 



P. corniger (Nort.). McLean, Je-Aug (Bdy-CU) ; Johnstown, Jl, 1908 (NYS). 



P. corticosus MacG. Saranac Inn, type. 



P. extensicornis (Nort.). "NY" (Nort) ; Ithaca (CU) ; W. Danby, May 31 (CU). 



Larva feeds on foliage of wheat. 

 P, gregarius Marl. Ithaca (MacG-Ill). 

 P. inconspicuus (Kby.). "NY", Dbl (type-Brit. Mus.). 



'^'^'^ If the Erlangen List is accepted, this generic name will have to be changed to Nematus Jurine 

 (Panzer). 



^^* If the Erlangen List is accepted, the generic name Nematws will have to be assigned to the 

 group here treated under the name Croesus, and the group treated as Nematus will have to be 

 called Holconeme Konow. 



