MONOGRAPH OF THE NORTH AMERICAN PROrTOTRYPID^. 113 



Tliis extensive genus was very proi)eily separated from Ceraphron 

 Jiirine, by Prof. Westwood, as early as 18,?L*. In 1856 Dr. Arnold Fiirs- 

 ter again separated from it the genus Lygorerun, to contain those species 

 having bare eyes and serrate antennae in the mah's. The habits of the 

 two genera are identical, and their structural difterences have been 

 sutiiciently jwinted out in my remarks under the genus LygoceruH. 



In 1888, 1 erected the ge»uis IJumeyaxpilus for some wingless forms 

 which I now find are true Megnspili. The name, however, is retained 

 for a closely allied apterous form, diflfering ia several particulars from 

 Mef/axpilug. 



Our species are numerous, and may be distinguished by the follow- 

 ing synoptical table : 



TABLE OP SPECIES. 

 FEMALES. 



1. Face very finely closely pnnctate or shagroenod 2 



Face smootli, polisheil, irapunctured. 



Apex of abdomen compressed, truncate, and gaping open, so that the valve) of 

 the ovipositor project. 

 Legs brownish -yellow ; antennse brown-black. 

 Pedicel shorter than the first flagellar joint ..M. axomaliventris, sp. nov. 

 Pedicel as long as the first flagellar joint; scape and pedicel pale. 



M. POPENOEI, sp. nov. 

 Apex of abdomen normal. 

 Legs brownish-yellow; antennsB brown-black. 



Pedicel as long as the first flagellar joint M. ambiguUS, sp. nov. 



Pedicel much shorter than the first flagellar joint. 

 Posterior tibias with a brown streak above M. striatipes, sp. nov. 



2. Wings wanting or not fully developed 3 



Wings fully developed. 



Species shining. 

 Face finely shagreened or rugose. 

 Scape aud legs pale brownish yellow. 



Pedicel concolorous witli flagellum M. SCHWARZI, sp. nov. 



Pedicel brownish-yellow. 

 Face rather coarsely rugose. 



Posterior coxa^ not black M. marylandicus, sp. nov. 



Posterior coxffi and femora dusky M. Harrington! Ashm. 



Stigma piceons-black, wings subfuscous. 



Stigma brown, wings clear hyaline M. HYAtiNiPENNis, Ashm. 



Species opa<iue, the thorax sometimes subopaque. 

 Face closely finely puuctulate. 

 Hind coxte black. 

 Scape, pedicel, aud legs rufous, the posterior femora and tibisB fuscous ; 



pleura scaly-pitnctaie M. PKNMARICUS, sp. nov. 



Scape, pedicel, and legs brownish -yellow M. virginicus, sp. nov. 



3. Wings abbreviated and narrow, reaching not quite to the middle of the abdomen. 



Scape, pedicel, first three flagellar joints, and legs, pale yellow. 

 "■' • M. OTTAWBN8IS Ashm. 



. Wings reaching only to the tip of the petiole. 



Antennae brown-black, scape beneath and legs brownish-yellow. 



M. CANADENSIS Ashm. 

 21899— No. 45 8 



