76 | APHIDS OF THE ROCKY MOUNTAIN REGION 
Type. Davis Collection. 
Chief Distinguishing Characters. In alate vivipara dainty white lines on the 
dorsum, decidedly transverse secondary sensoria on III and two pairs of finger- 
like dorsal tubercles on the abdomen. 
This species resembles very closely M. pulchellus Glendenning (1929:237) 
but differs as follows: Longer unguis and fewer sensoria on III. M. pulchellus 
has unguis hardly as long as half base of VI and 18 - 25 sensoria on III of alate 
vivipara. 
Genus Neosymydobius Baker 
Baker, 1920a:30. © 
Characters. Frontal tubercles slightly developed. Antenna with inconspic- 
uous hairs, unguis not Ilcnger than base of VI (except in annulatus); secondary 
and primary sensoria oval to circular; present in aptera. Hairs on body simple, 
somewhat spinelike. Imbrications on antenna and cornicle minutely denticu- 
late. Cornicle truncate, somewhat broader at base and with flange. Cauda 
semicircular, broader than long; anal plate slightly indented. Living on bark 
of twigs of trees. 
Genotype (monotypical), Symydobius albasiphus Davis. 
Key to Species of Neosymydobius 
1. VI with unguis twice as long as base of segment. (p. 76) -..........cccsscscceesecceeecsseeeeecees annulatus 
.. VI with unguis shorter than twice length of base of segment..........2.....:c0ccccsesesececeseceecnenseeeees 2 
2) Ili Tongersthans5 times ung wise (pondidi) c-seec-eecee e e ee intermedius 
Lidsshorter.than:5 ‘termes: wns ass” (ps 76) cesses ae eae nea albasiphus 
[Genotype Neosymydobius albasiphus (Davis) ] 
"20=.235" “I2"—,16 .09-.10 
Fig. 78. Neosymydobius albasiphus 
28 = “3 yee AZ Serna AD 
Lachnus quercifoliae Fitch, (misidentification), Thomas, 1879:118. 
Symydobius albasiphus Davis, 1914:226. 
Alate Vivipara. Head and thorax dark; abdomen brown with median line ‘‘whitish yel- 
low’; antenna anrutated; legs dusky; cauda, cornicle and anal plate pale; wings hyaline 
with slight duskiness at the tips of veins. Body length 1.4-1.6; across eyes .41; antenna “‘.95’’- 
1.19; hind tibia 1.05-1.10; rostrum attaining about to 2d coxa. Hairs simple, fine, rather 
sparse; .05 long on vertex and body. Cauda rounded; anal plate indented. Cornicle truncate, 
very short and inconspicuous. Lateral tubercles present, sensorialike in appearance. 
Ovipara. Apterous. Body length 1.4-‘'2”; across eyes .42; antenna about 1 long; hind 
tibia .90. Abdomen somewhat drawn out into an ovipositor. Hind tibia considerably swollen 
and bearing large, scattered sensoria over four-fifths of length. 
Male. Alate.. Color markings same as in alate vivipara. Antenna with sensofia on III, 
IV and V. ° 
Host. On leaves of Quercus alba (Not yet taken in region). 
Type. Davis Collection. 
99 
Neosymydobius annulatus (Koch) 
Chaitophorus annulatus Koch, 1854:7. 
Calaphis annulata, Gillette and Palmer, 1931:901. 
Alate Vivipara. Pale yellowish green marked with brown on head and thorax and with 
dusky bands on abdominal segments; cornicle, cauda and anal plate, rostrum and antenna 
except proximal portion of III dusky; 3d pair of legs dusky, 1st pair mostly pale yellowish; 
