8 PEOCEEDINGS OF THE NATIONAL MUSEUM vol. 67 



Alate viviparous female. — The antennal segments are as follows: 



The sensoria of segment III are tuberculate and evenly distributed 

 throughout nearly the entire length. Other segments without sec- 

 ondary sensoria. VI with a group of six small sensoria adjacent to 

 the larger one. IV and V faintly imbricated, V more distinctly so 

 toward the tip. I slightly gibbous on inner side. Head 0.608 mm. 

 wide through the eyes. Antennal tubercles fairly prominent. Beak 

 reaching nearly to second coxae. Cornicles 0.624 mm. long, distinctly 

 reticulate for a distance of 0.16 mm.; largest diameter, 0.088 mm.; 

 smallest diameter, 0.064 mm. ; flange, 0.08 mm. The cauda is twisted 

 in our specimen, but Van der Goot states that it is of the same length 

 as the cornicles. There appears to be two sets of lateral hairs. 

 Spiracles and hairs of abdomen as shown in figure 172. 



Apterous viviparous female. — The only specimen we have is in very 

 poor condition. The single antenna present is slightly longer than 

 the bod}^, the segments being as follows: 



The third segment has about 25 sensoria scattered over nearly the 

 entire length. The head is 0.608 mm. wide through the eyes. The 

 antennal tubercles are distinct. 



The beak reaches almost to the third coxae. The one cornicle 

 which is present is 0.64 mm. long, being distinctly reticulated for a 

 distance of 0.128 mm.; widest diameter, 0.096 nim.; narrowest diam- 

 eter, 0.064 mm. ; flange, 0.08 mm. Theobald says they are variable 

 in form, some being almost cylindrical. The cauda is twisted; Van 

 der Goot says that it is of the same length as the cornicles. His 

 figure shows it to be broad and not constricted. 



Host. — Aconitum napellus . 



Distribution. — ^JHolland, Bergedorf near Hamburg, Germany (deter- 

 minations verified by Van der Goot), and Yorkshire, England. 



Metatype. — Deposited in the U. S. National Museum. 



