A SYNOPSIS OF THE APHIDIDAE 23 



Records. Bamboo, Berkeley (Clarke, Essig) ; Arundinaria japonica, Berkeley, 

 June, 1915. 



In the San Francisco Bay region and in the Sacramento Valley 

 this species is often found infesting the upper and lower surfaces of 

 the leaves of various bamboos, particularly species of Arundinaria, 

 Bambusa, and Phyllostachys, and the giant reed (Arundo donax). 

 Reports list it from Alameda, Sacramento, San Francisco, and Santa 

 Clara counties. The species described by Davidson (1914) as Eucal- 

 lipterus arundicolens (Clarke) and reported from southern California 

 by Essig (1912) proves to be distinct, and was described by Essig 

 (1917) as M. arundinariae. The following brief description is from 

 a collection made by the author on June 9, 1915, from Arundinarm 

 japonica on the campus of the University of California in Berkeley. 



Alate viviparous female. (Second generation?) Prevailing 

 color, pale yellow. Head twice as wide as long, pale yellow, with 

 prominent red eyes. Antennal tubercles absent. Antennae longer 

 than body ; formula III, IV, V, VI spur, VI base, I, II. Segments all 

 pale except the margins of I and II, the apices of III, IV, V, and a 

 band about one-sixth the length of III a short distance from the base 

 of III (fig. 48), which are black, and VI which is slightly dusky. 

 There are five or six transverse secondary sensoria on III, located in 

 the dark band. The usual primary sensoria are present on V and VI, 

 and the usual accessor sensoria on VI. Beak pale and short, reaching 

 only to the middle of the first coxae. Thorax and abdomen normal, 

 pale yellow, without tubercles or dusky markings. Cornicles (fig. 51) 

 pale, short, broader at base than at apex. Cauda short, constricted 

 in the middle, with distal end black. Anal plate (fig. 52) pale, deeply 

 bilobed. Wings normal, hyaline, with the first and second discoidal 

 veins and the base of the stigmal vein darker than the others. There 

 is a perceptible shading at the tip of each vein. 



Measurements: Body length 1.326 to 2.023 mm. (av. 1.644 mm.), 

 width of thorax 0.51 to 0.68 mm. (av. 0.612 mm.), antennae total 

 2.839 to 3.077 mm. (av. 2.9299 mm.), Ill 0.8925 to 0.986 mm. (av. 

 0.9324 mm.), IV 0.578 to 0.663 mm. (av. 0.6423 mm.), V 0.527 to 

 0.561 mm. (av. 0.5403 mm.), VI base 0.306 to 0.323 mm. (av. 0.3103 

 mm.), VI spur 0.34 to 0.425 mm. (av. 0.3691 mm.), cornicle 0.595 to 

 0.765 mm. (av. 0.7002 mm.), cauda 0.153 mm., wing length 2.25 to 

 3.96 mm. (av. 2.9097 mm.), width 1.02 to 1.122 mm. (av. 1.071 mm.), 

 expansion 6.341 to 6.97 mm. (av. 6.6555 mm.). 



