SUBFAMILY APHINAE 223 
This species differs from R. fitchii as follows: Considerably shorter cornicle 
(shorter than IV instead of equal to or longer than IV), less pronounced flange 
on cornicle, and length of cauda (shorter than base of VI instead of longer). 
Rhopalosiphum serotinae Oestlund 
Rhopalosiphum serotinae Oestlund, 1887:76; Gillette and Palmer, 1932b:491. 
Fundatrix. Color as in apterous summer vivipara. Body length 1.77; hind tibia .70; 
antenna .80. 
Apterous Summer Vivipara. Yellowish apple-green; appendages pale with dark tips; 
cornicle slightly dusky with dark tip; cauda pale brownish. Body length 1.50-1.90; hind tibia 
.75-.90; hind tarsal II .10; antenna 1.15-1.30; rostrum obtuse, IV+V slender, nearly attaining 
2d coxa. | 
Alate Vivipara. Head and prothorax green; thoracic lobes brown; abdomen pale apple- 
green; cornicle pale dusky with dark tip; cauda pale brownish; appendages dusky; wings with 
venation heavy. Same in measurements as aptera except antenna 1.37, secondary sensoria 
large. Hairs blunt; on hind tibia .02. Cornicle smooth, strongly swollen except. at end just 
proximal to swollen flange, and 3 times as wide as hind tibia. Cauda tapering, blunt, bearing 
2 pairs of lateral and a single preapical hair. 
Ovipara. Apterous. Color and measurements same as in apterous vivipara, with proximal 
third of hind tibia slightly swollen and bearing about 6 large sensoria. 
sen, 1-2 
Fund. 23-25 NOES. 
fc yee camel i) 
19-22 Sen 0-2 
Fund. .33 —38 
Alate=Apt: Viv. 36-42 
Fig. 261. Rhopalosiphum serotinae 
Male. Apterous. Color same as in ovipara. Body length 1; hind tibia .50; antenna .85-.95, 
III .17-.18, IV .14-.16, V .13-.14, VI .07-++.22-.27; a few secondary sensoria on III, IV and V; 
cornicle .26. 
Egg. Newly iaid, pale greenish yellow; later, black. Size .60 by .30. 
Collections. On Solidago sp. Colorado: Denver, Boulder and Fort Collins. 
Utah: Hyrum and Logan. Fundatrices May 17, apterous summer viviparae May 
18 to Oct. 2, alate viviparae June 15 to 23, sexuales Oct. 2 to 19; not rare. 
Cotypes. Univ. of Minn. Collection. 
This species has been made genotype of the genus Cachryphora by Oest- 
lund. It seems to the writer that the characters are sufficient for a subgenus 
only. 
Chief Distinguishing Characters. Strongly swollen cornicle with thick 
flange preceded by neck, short thick tapering cauda and presence of sensoria on 
III and sometimes on IV of apterous vivipara. 
Rhopalosiphum splendens (Theobald) 
The Mediterranean Grain Aphid 
Siphocoryne splendens Theobald, 1915:116. 
Rhopalosiphum splendens, Palmer, 1939:345. 
Apterous Vivipara. Medium green, marked with red or orange about and between the 
bases of the cornicles; appendages, cornicle and cauda dusky to black. Length of body 
1.2-1.5; antenna 1, III and IV unusually coalesced; hind tibia .65-.68; cauda nearly parallel- 
sided, bearing 2 pairs of lateral hairs; rostrum attaining abdominal I. Hairs erect; on side 
of abdomen .07-.09. 
Alate Vivipara. Color same as in apterous vivipara except head and thorax which are 
black. Body length 1.5; hind tibia .85; antenna 1.25. Rostrum attaining 3d coxa or abdominal 
I. Hairs semierect; on side of body .02-.03. Cornicle incrassate to nearly cylindrical with 
rather heavy flange, imbricated. Cauda slightly spoon-shaped, bearing two pairs of lateral 
hairs. 
Collections. On fall wheat (Triticum vulgare) and grass, in leaf bases and 
roots. Colorado: Julesburg, Rocky Ford and Holyoke. Alate and apterous 
viviparae Nov. 3 to Dec. 3; apparently not common. 
