SUBFAMILY APHINAE 317 
2-2.4; antenna 3.4-4, secondary sensoria rather large, often nearly half the diameter of III; 
rostrum attaining 2d coxa. Hairs blunt to slightly capitate; on side of abdomen .03. Cauda 
tapering, without definite neck bearing 4 pairs of lateral and 2 dorsal hairs. 
Alate Vivipara. Same as apterous vivipara except as figured. 
Collections. On leaves of Mertensia sp. Colorado: Colorado Springs and 
Roggin. Alate and apterous summer viviparae May 13 and June 19; apparently 
rare. 
Type. U.S.N.M., No. 49290. Paratypes, Colo. Agr. Exp. Sta. Collection. 
a 70-1.00 , 
“ha v, 
Fig. 378. Macrosiphum mertensiae 
Chief Distinguishing Characters. Length of cornicle (shorter than III but 
longer than IV, not shorter than .70 and longer than width across eyes), number 
of sensoria on III (in alate vivipara 18 or more, in aptera 7 or more), length of 
cauda (not exceeding half length of cornicle), length of reticulation on cornicle 
(not exceeding .18 mm or seventh to fifth of length of cornicle), hairs on cauda 
(4 lateral pairs) and length of rostral IV+V (.13-.14, slightly shorter than base 
of antennal VI or hind tarsal II). 
Macrosiphum nigromaculosum Macdougall 
The Black and Red Rose Aphid 
Macrosiphum nigromaculosum Macdougall, 1926:168; Gillette and Palmer, 1934:190. 
Fundatrix (possible not this species), Entire body and antennal I chestnut-brown with 
black crossband on abdominal VI, traces of black ring about each cornicle base, and median 
spot on abdominal V; antennal II, III+-IV coalesced and base of V pale yellow, remainder 
black; tibiae pale yellow with tips black; cornicle and tarsi black; cauda pale; anal plate 
brown. Body length 2.70; hind tibia 1.2; hind tarsal II .07; across eyes .50; antenna 1.25, 
III+IV coalesced .42-.50, V .20-.25, VI .15+.30; cornicle .35, reticulated area .05; cauda .20 
on median line, .27 on side; rostral IV+ V .12; cornicle expanded at base to twice the diameter 
of the portion just back of flange, covered with heavy imbrications. Cauda tapering, without 
distinct neck and bearing 4 pairs of lateral hairs and a single dorsal one. Fundatrigenia. 
Nymph. Light red or rose-brown with head slightly dusky; abdomen marked with dark around 
each cornicle base and across dorsum of VI as in fundatrix; cornicle brown; appendages pale 
yellew; tarsi dusky. 
ae re 
Y 20 
-18- 
04 aN iree ae 
yy ie 
Drs aes 
Sarr meee : 
Fig. 379. Macrosiphum nigromaculosum 
RAD LAN Ne an 
Co\Apt:,.65- oA) 
iih3 Si 40) RLS 
Apterous Summer Vivipara. Body length 3; hind tibia 2.15-2.50; antenna 3-4. Ocular 
tubercle large. Lateral tubercles shallow. Hairs on vertex capitate or pointed; on side of 
abdomen blunt, .04 long. Cauda tapering, bearing 3-5 lateral and dorsolateral hairs on each 
side. Cornicle not greatly enlarged at base, hexagonal reticulations extending .15 from apex 
then transverse elongate reticulations or closed imbrications to .25 mm from tip and rather 
heavy imbrications on remainder. Body truncate posteriorly and cornicles held at right 
angles to body. This habit, together with the striking color pattern, gives the species a very 
distinctive appearance. 
7 
