244 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.43. 



Genus PTERONIDEA Rohwer. 



Group TRTLTWEATa:. 



Marlatt in his Revision of North American Nematinse, page 66, 

 places similaris (Norton), rohinix (Forbes) as synonyms of trilineata 

 (Norton). An examination of the types of the species in question 

 proves that they are distinct and may be separated by the following 

 characters : 



Lateral walls of ocellar basin obsolete: prescutum entirely pale; length 4.5 mm. 



robiniae 



Lateral walls of ocellar basin present; prescutum partly black; larger 1 



1. Lateral walls of the ocellar basin meeting on the postocellar line, the anterior ocellus 



being inclosed in the basin similaris 



Lateral walls of the ocellar basin meeting at the anterior ocellus, which is at the top 

 of the basin forming part of the wall trilineata 



PTERONIDEA ROBINIiE (Forbes). 



Type.— Cat. No. 14413, U.S.N.M. 

 Food-plant. — Rohinia psevdacacia. 



PTEROmDEA SIIVULARIS (Norton). 



Figured under name trilineata, pi. 14, fig. 28, Howard's Insect Book. 

 Type.— Cdit. No. 14414, U.S.N.M. 

 Food-plant. — Rohinia pseudacacia. 



PTERONIDEA TRIUNEATA (Nortoi.). 



Type. — In the collections of the American Entomological Society. 

 Food-plant. — Salix tristis. 



Genus AMAURONEMATUS Konow. 



AMAURONEMATUS KNABI, new species. 



In the current classification this will fall near lincohiensis Eohwer, 

 from which it may easily be separated by the shape of the sheath, 

 better defined ocellar basin, and other characters 



Female. — Length 6 mm. Anterior margin of the clypeus deeply 

 arcuately emarginate, lobes obtusely triangular; supraclypeal foveiB 

 punctiform, deep, well separated from the antenna! foveas; supra- 

 clypeal area gently convex; middle fovea deep, elongate, breaking 

 through the crest; ocellar basin well defined, the lower wall better 

 defined; antennal furrows nearly complete, broadening at top; post- 

 ocellar area gently convex, the anterior margin curved; postocellar line 

 longer than the ocellocular line; antennae of medium length, the fourth 

 joint slightly longer than the third; scutellum with a longitudinal fur- 

 row, the scutellar lobe large, granular; stigma gently rounded below; 

 venation normal; cerci long slender not tapering; sheath convex 

 above, apex sharp, obliquely truncate below. Rufo-testaceous; 

 antennae, intraocellar area, spot on scutellum, first five tergal seg- 



