30 John June Davis 



Winged viviparous female: Antennal segment III bears 18 to 21 irregu- 

 larly placed, circular sensoria ; no other sensoria excepting the usual ones 

 at the distal ends of V and VI base. Measurements as follows : 



Wings typical of the genus Macrosiphum, and Mi (first branch of the 

 third discoidal) branches at one half the distance from where Ms^ 

 branches to the tip of the wing. Cornicles and style as in the wingless 

 except that they appear to be shorter, especially do the cornicles. Camera 

 lucida drawing of the cornicles and style of the wingless viviparous 

 female is given in Plate V, fig. 95. 



This is the same species as was collected by Mr. J. T. Monell 

 and the writer at St. Louis, Mo., October i, 19 10, on Gaura lind- 

 heimeri. Both green and pink forms were found at that time. 



103. M. gaurae (Williams) {Siph. gaurina Williams). 



" Siphonophora gaurina n. sp. No. 141. On Gaura, Ash- 

 land, [Date not legible] 1890." 



Three adult wingless females and one pupa on the slide. An- 

 tennal segment III of the adult female bears 3 to 6 circular sen- 

 soria on the basal third. Comparative lengths of segments III 

 and VI filament as follows: 



It is noteworthy that Williams in his original description says that 

 segment III is a little longer than VI filament, which statement 

 does not agree with the above measurements. Cornicles faintly 

 imbricate at the tip. One of these wingless individuals is smaller, 

 and the other two are slightly larger than one of the wingless 



282 



