100 



"io6" and "Th P Nov. 30 root". Discoidal vein with one branch, an- 

 tennae 6-segmented, the 3d and 6th segments subequal in 

 length. Other characters indistinct because of the poor condi- 

 tion of the specimens. They are probably Schisoneura panic- 

 ola Thos., and may be the types, which were said to have been 

 collected by Th. Pergande on grass roots in November. 



"4x Aphid on Foxtail grass". Aphis sp. ; immature specimens. 

 This is A. setaricc Thos. according to Monell. 



"Aphis on Cephalanthus Aug. 5/76 a". Aphis cephalanthi Thos. 



The last two mentioned are on the same slide, and are 

 mounts from Mr. J. T. Monell. 



"Tomato occidentalis May 26, '78". This is the species described 

 by Thomas as Megoura solani (now referred to the genus Rho- 

 palosiphimi) , and quite likely it is the type, which he says was 

 collected on tomato in May. Measurements taken from this 

 specimen are as follows. 



Right antennal segment III with 8 sensoria in a row, the 

 left segment with 6 or 7. The third discoidal branches at a 

 little more than half the distance from the base to the tip of 

 the wing. Length of cornicles, 0.3586 and 0.3749 mm., re- 

 spectively; and the greatest width, 0.1304 and 0.1222 mm. 

 Length of cauda, 0.1304 mm. 



This is not Mymis persiccc Sulz. {^=Rhopalosiphum dian- 

 thi) as has been considered by some authors. 



Camera lucida drawings from the Thomas specimen, of the 

 head, antenna, cornicle, and cauda, are shown in Figaires 5-8, 

 Plate VL 

 "Pemphigus acerifolics Monell S[ept.?] 24, '78". In very poor con- 

 dition. 

 "Pine Carb[ondale, 111.] Apr. 20, 1878". A single winged viviparous 

 female in balsam. This is Mindarus abietinus Koch, and is 

 probably the type of Schiconenra pinicola Thos., which 



*The measurements for III may not be exactly accurate as it is quite slanting 

 on the slide and consequently difficult to measure. 



