l68 ENTOMOLOGICAL NEWS. [April, '14 



The Nearctic Species of the Hymenopterous Genus 



Sympha Foerster/ 



By S. A. RoHWER. 



As far as the writer can learn no record of the host of any 

 species of the Dacnusine genus Sympha has ever been pub- 

 lished. Mr. C. T. Greene has bred a species, Sympha agromy- 

 zae, from the pupa of a species of Agromyza where it is a 

 primary parasite. The conditions under which the host lives 

 i&nd some remarks on the parasite will be published by Mr. 

 Greene. 



While studying these Nearctic species the writer studied the 

 literature dealing with the European species and judging from 

 it none of the species noted here are the same as any of the 

 European species, although sericea (Provancher) is evidently 

 closely allied to ringens (Haliday). 



TABLE TO THE SPECIES. 

 Mesonotum coarsely sculptured, notauli not sharply defined; (head 

 rather densely and strongly punctured above antennae), 



belfragei Ashmead 

 Mesonotum not coarsely sculptured, notauli well defined i 



1. Prescutum without a median furrow; head below the antennae 



shining and impunctate litcida Rohwer 



Prescutum with a median furrow which is f oveolate ; head below 

 the antennae punctured 2 



2. Head above the antennae impunctate ; suture in front of the scutel- 



lum without a strong longitudinal carina, 



portlandica Rohwer 



Head above the antennae with separate punctures ; suture in front 



of the scutellum with strong carinae 3 



3. Dorsal and posterior aspects of the propodeum separated by a com- 



plete oblique carina; (antennae 29-jointed, scape black; hind 



tarsi dusky) nigricornis Rohwer 



Dorsal and posterior aspects of propodeum not separated by 

 carina 4 



4. Hind tarsi dusky; antennae 27 to 29-jointed; median carina of first 



tergite complete to apex sericea Provancher 



Hind tarsi pale; antennae 32-jointed; median carina of first tergite 

 not extending to apex agromyzae Rohwer 



*A contribution from the Branch of Forest Insects of the Bureau 

 of Entomology, Washington, D. C. 



