REPORT OF THE STATE ENTOMOLOGIST I904 



463 



on the ventral surface of this basal segment. Ordinarily the clas- 

 pette is represented by one or more spined tubercles, but in the 

 extremely generalized Protoculex serratus Theo., this 

 organ is represented by <• ^ ^ 



a conspicuous basal 

 spined lobe and a longer, 

 acute one near the apex 

 of the basal segment. 

 This suggests that a still 

 more generalized form 

 may possess clasps and 

 their ventral counter- 

 part, the claspette, more 

 largely developed, and 

 it is possible that in 

 some forms they are 

 approximately equal. 

 There is an approach to 

 this in Wyeomyia 

 s m i t h i i Coq. The 

 basal clasp segment 

 consists of two nearly 

 equal chitinous pro- 

 cesses connected only 

 by a thin membrane apically and by no means firmly joined 

 basally. The peculiar divided terminal segment is plainly com- 

 pound and may have been produced by the fusion of two 

 comparatively simple processes. This conception affords a ready 

 explanation for the persistance throughout the group of more or less 

 prominent tubercular elevations on the ventral surface of the clasp 

 segment, and if our interpretation be correct, the degree of develop- 

 ment along certain lines at least, will be accurately indicated 

 by this organ. 



The terminal clasp segment is much more slender than the basal 

 one and in some species is very elongate and arcuate. This is 

 particularly true in the Anophelinae. The large majority of forms 

 have at or near the apex of the terminal clasp segment, a more or 

 less developed spine, apparently the rudiment of a ventral second 

 segment and analogous to the claspette of the basal segment. 

 This spine is absent in some forms and double in others. This 

 terminal segment presents considerable morphologic differences 

 and in some forms bears striking appendages, notably in the case 



Fig. 



Protoculex serratus, ventral aspect 

 of male genitalia: <es=temiinal clasp segment; 

 bes=hasa.\ clasp segment; /j=harpes; hp=ha.rpa.- 

 go; c=claspette; 5/=setaceous lobes, much en- 

 larged (Original) 



