PHYLOGENY OF THE NEMOCERA. 



255 



the points of agreement are fairly strong in group I, strong also 

 in group 2, weak in groups 3 and 4, and fairly strong in group 5. 

 If the weak groups are examined anomalies will be seen in 

 group 3; the Simulidse seem out of place. I have lately found a 

 structure in the palpi of 6*. reptans and Rhyphus fenestralis and 

 R. punctatus 9 , which convince me of a near relationship and 

 common ancestiy of these two families. By adding Simulium to 

 group I there results a larger proportion of similar characters. 



TABLE III. 



CHARACTERS OF THE GENITALIA IN THE NEMOCERA. 



1 Where nothing is stated these organs are not chitinous and do not show in 

 preparations. 



2 Approximates to that of the Rhyphidae. 



3 1-2 in Ceralopogon. 



4 Complicated and peculiar, but approximates. 



Nor can I reconcile myself to the inclusion of the Scatopsinae, 

 though this subfamily, unlike the Simulidae, will not fit well 

 into group I, notwithstanding that the genitalia show marked 

 affinities with those of Tipula. The very marked specialization 

 of the mouth structure and the three ocelli outweigh in importance 

 the archaic eye structure, the bristle structure, especially that 

 of the legs, and pharyngeal pump; I can not at present suggest 



