I 



REPORT OF THE STATE ENTOMOLOGIST I914 



231 



The American representatives of this genus have a very close 

 general resemblance, being usually reddish brown, rather large 

 insects. They vary widely in certain characteristics, the male 

 antennae ranging in number from 23 segments down to 12 segments, 

 and the stem of the fifth segment varying in length from about 



Fig. 51 Rhopalomyia species; two views of fifth antennal segment to 

 show modifications in the circumfiU, enlarged (original) 



one-fourth longer than the basal enlargement to a stem only one- 

 third the length of the basal enlargement. The segments of the 

 female antennae vary in number from 25 to 13 and may have a stem 

 one-third the length of the basal enlargement or be practically 

 sessile. The palpi are uni- or bi- 

 articulate. The male genitalia and 

 the ovipositor of the female are 

 quite characteristic of the genus, 

 though approached in form by cer- 

 tain other genera. The general ap- 

 pearance of the wing is character- 

 istic, the third vein uniting with the margin at or very close to the 

 apex, while the distal third of the fifth vein is very faint (Plate 17, 



Fig. 52 Rhopalomyia sp.; 

 female palpus, enlarged (original) 



