do not reach to the tegulae, remarks that "les propleures les 

 atteignent." The prothoracic pleura, however, are far removed 

 from the tegulae and contribute largely to a lengthening of the 

 prothorax anteriorly, while the space between the hind angle 

 of the pronotum and the tegulae is occupied by the anterior part 

 of the mesopleura, almost exactly as in some Sphcgidac. In his 

 figures showing the structure of Gonatopus, Kiefifer, as did Ash- 

 mead in his descriptions, mistakes the hind lobe of the pronotum, 

 when this sclerite is divided by a transverse furrow, for a part 

 of the mesonotum. But the latter is formed in front solely by 

 a narrow stalk, easily separable from the pronotum, which is 

 movable upon it, and posteriorly a small scutellum is sometimes 

 defined, articulating with the propodeum (or fused metathoracic 

 and first abdominal segment) and also separable at the articula- 

 tion. As a matter of fact, the large pronotum of Gonatopus is 

 almost identical in structure with that of some winged forms, 

 and its development is correlated with the great development in 

 length of the front legs. It is interesting to note that in the 

 winged Dryinini the mesonotum, though wide for the most part, 

 is anteriorly narrowed into a small neck fitting into the prono- 

 tum, which is movable upon it. In some genera the parapsidal 

 furrows extend back from this neck, and if the parts of the 

 mesonotum exterior to the furrows be left out, a thorax ex- 

 tremely similar to that of Gonatopus results. But in full-winged 

 forms, as is natural, no such reduction of the mesonotum ever 

 takes place. 



The close alliance of the tribes that I have recognized in the 

 Dryininae is shown by the extreme resemblance of males of such 

 forms as Ncodryiiius to those of some Gonatopus s. /.; and 

 Eiikocbelcia makes a great approach in some respects to the 

 Anteonini. In making these studies I have critically examined 

 about seventy species of Gonatopus s. I. and about fifty species 

 of winged forms, in addition to a large number of European 

 forms, winged and wingless. The greater number of these 

 having been bred, I would specially refer to two points : ( 1 ) The 

 variability of some species in color or sculpture, or both ; ( 2 ) 

 the importance of the form and armature of the claw of the 

 chelae, which in the Gonatopiform species at once enables the 

 parasite to be determined as to whether it attacks a Jassoid or 

 Fulgoroid Homopteron. All the literature known to me on these 

 insects has also been examined. 



