DESCRIPTIONS OF THIRTY-ONE NEW SPECIES OF 

 HYMENOPTERA. 



By S. A. RoHWER, 



0/ the Bureau of Entomology, United States Department of Agriculture. 



The following paper, which is a contribution from the Branch of 

 Forest Insects, Bureau of Entomology, contains the description of 

 81 new Hymenoptera, most of which have been reared as parasites of 

 forest insects. The types of all the new species are in the United 

 States National Museum collection. 



Suborder Chalastogastra. 

 Superfamily TENTHREDINOIDEA. 



TENTHREDELLA BIRMENSIS. new name. 



Tenthredo gribodoi Konow, Ent. Nachr., vol. 24, 1898, p. 89, not Tenthredo 

 gribodoi Costa, Rend. Ace. Napoli (2), vol. 3, 1894, p. 87. 



MACROPHTA CASTANEAE, new species. 



This species is related to cassandra Kirby, but may be separated 

 from that species by the more coarsely punctured head and thorax 

 and by the pale hind tarsi. It also resembles dejectm Norton, but 

 differs from Norton's species in the black clypeus and in having the 

 anterior margin of the cylpeus subsquarely emarginate with obtuse 

 lobes. (The clypeus of dejectus is subsquarely emarginate with tri- 

 angularly shaped pointed lobes.) 



Male. — Length 8.5 mm. Labrum well exserted, apex subtruncate; 

 clypeus shining with a few large, separate punctures, anterior mar- 

 gin deeply, subsquarely emarginate, the lobes at base half as broad 

 as the emargination, their apices broadly rounded ; supraclypeal area 

 flat; supraclypeal foveae deep, punctiform; middle fovea, ocellar 

 basin and the antennal furrows obsolete; head with large, close, 

 sometimes confluent punctures which are more widely separated on 

 the vertex and posterior orbits; posterior orbits with a sharp carina 

 to the top of the eye ; postocellar furrow poorly defined but complete ; 



Proceedinqs U. S. National Museum, Vol. 53— 2195. 



151 



