362 NEW YORK STATE MUSEUM 



RHOPALOMYIA Rubs. 



This genus was erected in 1892 by Rubsaamen, with R. 

 tanaceticola Karsch as type. This species is a very char- 

 acteristic form, the third vein uniting with the margin at the 

 apex of the wing; the fifth with its distal portion very faint, 

 joins the posterior margin at the distal third, its branch near 

 the basal third. The pulvilli are fully as long as the simple 

 clawSj the ,palpi uniarticulate and the antennae composed of 

 19 segments in both sexes. The fifth segment in the male has 

 a stem equal to the basal enlargement., which latter has 

 a length about twice its diameter, a thick subbasal whorl of 

 rather long, stout setae and the distal two thirds ornamented 

 with a thick whorl of long, curved setae ; low circumfili pre- 

 sumably occur on the enlargement near the basal third and 

 apically. The genitalia are of the same type commonly seen 

 in American representatives of this genus. The fifth segment 

 of the female antennae has a stem ^ the length of the basal 

 enlargement, which latter is produced and has a length nearly 

 2^ times its diameter and with the distal two thirds irregularly 

 traversed by rather numerous anastomosing circumfili. The ovi- 

 positor is probably about ^ the length of the abdomen when 

 fully extended, the terminal lobes rather short, broad and taper- 

 ing to a broadly rounded apex, rather sparsely clothed with 

 coarse setae. 



The American representatives of this genus have a very close gen- 

 eral resemblance, being usually reddish brown, rather large insects. 

 They vary widely in certain characteristics, the male antennae rang- 

 ing in number from 23 segments down to 12 segments, and the stem 

 of the fifth segment varying in length from about }i longer than 

 the basal enlargement to a stem only Yz the length of the basal en- 

 largement. The segments of the female antennae vary in number 

 from 25 to 13 and may have a stem ]A, the length of the basal en- 

 largement or be practically sessile. The palpi are uni or biarticu- 

 late. The male genitalia and the ovipositor of the female are 

 quite characteristic of the genus, though approached in form by 

 certain other genera. The general appearance of the wing is 

 characteristic, 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 [pi. 34, fig. 2, 10]. The claws are invariably simple and the 

 pulvilli usually as long or a little longer than the claws. 



