6 PROCEEDINGS OF THE 



difference being a slight one in the markings and in the manner 

 of pupation : as already remarked, they do not pupate in the mine. 

 I have had great trouble in differentiating the species. Un- 

 fortunately the descriptions of Klug and Hartig are not very 

 explicit, as these authors relied mainly on colour for their 

 specific distinctions, and colour alone will not serve to properly 

 elucidate such obscure forms. The excellent work of Thomson, 

 depending as that author does upon structural as well as colour 

 distinctions, is a great step in advance upon that of the German 

 authorities, and I have derived much assistance from the 

 " Hymenoptera Scandinaviae." I have to acknowledge my 

 indebtedness to Mr C. Healy for types of the species described by 

 him in " Newman's Entomologist," or otherwise I would not 

 have been able to satisfactorily determine them — or at any rate 

 some of them — from the descriptions alone. Prof. Zaddach of 

 Konigsberg has given me types of P. immila and pygmaea. 



A. Frontal sutures distinct ; head pilose; marginal nervnre received a 

 good piece beyond the second sub-marginal. Antennae short, pilose. 

 Feet more or less black. 



Antennae not thickened towards the apex, 3d joint more than double the 

 length of the 4th — melanopoda. 



Antennae perceptibly thickened towards the apex, 3d joint not more 

 than double the length of the 4th — pumila. 



1. Phaenusa melanopoda, Cameron. 



Fenusa^ nigricans, Thoms., Hymen. Scand., i., 184, 1. 



Glossy-black ; antennae shortly pilose, a little curved, as long, 

 if not longer than the thorax; the 1st joint large, globose, with a 

 pedicle at the base; the 2d nearly as long as the 1st, not so 

 globose; 3d more than double the length of the 4th; the rest to 

 the 8th getting a little shorter ; 9th conical, thinner and longer 

 than the 8th. Head scarcely narrower than the thorax, smooth, 

 covered with a fuscous black pubescence; sutures distinct, 

 moderately deep; labrum and mandibles piceous ; palpi fuscous. 

 Thorax shining, smooth, scarcely pubescent ; sutures very distinct; 

 cenchri obscure. Breast smooth, shining. Feet : all the knees, 

 and four anterior tibiae and tarsi obscure yellowish-white, verging 

 to testaceous ; tarsi sliglitly darker; spurs short. Abdomen short; 

 apex truncated obliquely ; sheaths of saw glabrous, a little 



* forrectly, J^hacnusa. 



