SUBFAMILY APHINAE 295 
(black), numerous sensoria on III (on aptera more than 20, on alate vivipara 
more than 30), length of III (shorter than IV+V), color of cauda (pale) and 
length of IV (averaging about the same as distance across eyes), length of 
cauda (distinctly shorter than IV), length of rostral IV+-V (not longer than 
.16) and color of body (dark red to blackish and with dark areas at hair bases). 
Macrosiphum barri Essig 
Macrosiphum barri Essig, 1949:151. 
Alate Vivipara. Head and mesothorax pale brownish green; prothorax and abdomen let- 
tuce-green; antenna beyond base of III, tarsi and tips of tibiae blackish; cauda and cornicle 
pale green. Body length 1.5-1.8; across eyes .39-.41; hind tibia 1.25-1.8; antenna 1.85-1.95; 
rostral IV+V bearing about 5 pairs of hairs and attaining between 2d and 3d coxae. Cornicle 
faintly imbricated and without reticulation. Cauda tapering with only slight constriction near 
base and bearing 3-4 pairs of lateral hairs and a single dorsal preapical one. 
Alate 
Viv. 47- .55 sen. 12-16 p sae i 28-32 = AS 
x me , 
* Pee Ue iret 58 OO soe 
2 VV. AO0-. ANE 
nT De p 
ath jy Ie ie PAA 
4A7-.60 Sen. 3-8 
Spr amine ie Oe neuat anh 
Fig. 350. Macrosiphum barri 
Apterous Summer Vivipara. General color lettuce-green, shading to yellowish on head; 
appendages pale green with tarsi, tips of tibiae and of antennal III, IV and V and entire VI 
blackish. Body length 1.6-2.2; across eyes .42; hind tibia 1.05-1.85; antenna 1.65-2.20; other- 
wise as in alate vivipara. 
Collections. On garden lettuce (Lactuca sativa), on seed stems. Colorado: 
Fort Collins and Palisade. Utah: Murray and American Fork. Alate and ap- 
terous viviparae early Aug. to Oct. 23; numerous and injurious but rarely oc- 
curring. 
Type. Essig Collection. Paratypes, Essig, W. F. Barr, Univ. of Idaho, 
U.S.N.M. and Calif. Acad. Sci. Collections. 
Chief Distinguishing Characters. Absence of reticulation on cornicle, com- 
paratively small number of sensoria on III (12-16 in alate and 3-7 in apterous 
vivipara), shortness of cornicle (hardly exceeding .40 in alate or .50 in apterous 
vivipara), shortness of unguis and III (hardly exceeding .50) and short, hairy 
rostral IV+V (.10-.12). 
From M. scariolae Nevsky this form is perhaps doubtfully distinct, differ- 
ing only in shorter antennal III (shorter than .65-.74) and shorter cornicle 
(shorter than .56) also possibly different shape of cornicle. 
Macrosiphum bonitum Hottes 
Macrosiphum bonitum Hottes, 1950a:15. 
wn af Nw | 
Hd. Ta. 3 a 3! 
Ty as 
ah) xh 
Fig. 351. Macrosiphum bonitum 
Apterous Summer Vivipara. “Brown to red”; cornicle and appendages black; cauda, anal 
plate and rostrum blackish. Body length about 2; across eyes .40; antenna about 2-2.4; hind 
tibia 1.25-1.35; rostrum attaining abdomen. Cauda tapering, with 3-4 pairs of lateral hairs. 
