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North American Hymenoptera 



379 



I 



« 



Pemphredon, Latr. 



I 



1. P. marginatus. Black ; anternse at base^ mandibles 

 and feet honey-yellow. 



Inhab. Pennsylvania. ', 



Body polished: antennce, blackish ; first and second 

 joints honey-yellow ; the former as long as the second and 

 third together, which are nearly equal : mandibles honey- 

 yellow, not very obviously denticulated at tip : wings 

 tinted with fuliginous ; nervures brown; stigma fuscous, 

 not much dilated ; nervures of the second cubital cellule 

 and second recurrent nervure rhargined with whitish, the 

 latter abbreviated before the anal tip : abdomen subsessile ; 



first 



feet 



Length over three twentieths of an inch. 



The second cubital cellule is somewhat larger than 



nervures 



it, as well as the 



second recurrent nervure, are less distinct than usual. 



2. P. annuldtus. 



mandibles 



lowish. 



> 



Inhab. Indjana- 



9 Borfy black, polished, minutely punctured: antennce^ 

 basal joint white ; second joint piceous : nasiis prominent 

 In the middle : mandibles and palpi white : wing-scale 

 dull honey-yellow : wings hyaline ; nervures blackish, 

 tinged with yellow at base ; first and second cubital cel- 

 lules recei\ning their appropriate recurrent nervures : mj^ta- 

 thorax with larger punctures and lines : abdomen polished, 

 impunctured, subsessile, the petiole being very short : 

 pleura with a small whitish dot under the wing-scale : 

 feet honey-yellow. 



Length one fifth of an inch. 



