96 THE GROUP OF PAMPHILIUS FLAV1VENTRIS. 



The larva lives solitary on pines, enveloping the 

 twigs with a covering of silk threads, beneath the 

 shelter of which it lives and feeds. 



They are found during July and August, the flies 

 appearing early in June. 



Apparently not common, but widely distributed in 

 Scotland and England. 



Continental distribution : Sweden, Germany, Russia, 

 Holland, France, Switzerland, Tyrol. 



Qfo St I am not quite satisfied that the above species is really the 

 nemoralis, Lin., and I have therefore not adopted the name. In the 

 Linna^an Collection nemoralis is represented by Nematus fallax; it 

 is not, however, the original type, but one inserted by Sir J. E. Smith 

 on the strength of his own identification. Zaddach (1. c., p. 151) refers 

 it (and I believe rightly) to punctat a, F. 



SECTION 2. Anterior tibice without a spine. Sutures 

 on vertex deep, so that the central part is distinctly 

 separated from the sides and more or less from the 

 front. Claws bifid. Transverse brachial nervure 

 present. 



I. THE GROUP OF FLAVIVENTRIS. 



Head, thorax, and abdomen black above, the sides, legs, and 

 more or less of face, yellow. Antenna? 24-jointed, third joint 

 as long as the three following united. Sutures on vertex 

 not very deep or distinct; head between antenna? projecting, 

 bluntly keeled. Subcostal nervure broken off beyond the 

 transverse costal nervure. Stigma black. Wings usually 

 with a smoky fascia in the middle. 



This is a very distinct group, and is, to some extent, 

 intermediate between Sections 1 and 2, inasmuch as 

 the sutures on vertex are not so well developed as in 

 the following groups; yet still the lateral furrows are 

 clearly enough denned. The wedge-shaped form of 

 the front is peculiar, as is also the manner in which 

 the subcostal nervure is broken off beyond the middle. 



The larvas of the four known species referred to this 

 group feed socially on fruit trees (Prunus, &c.) 



