466 
Journal of Agricultural Research 
Vol. VII, No. ii 
Ind., in 1908. Most of the grasses in the experiments at La Fayette, 
Ind., were obtained from the experimental plots of the Purdue Experi¬ 
ment Station. 
Other members of the Office of Cereal and Forage Insect Investiga¬ 
tions have recorded the following hosts: Bursa bursa-pastoris f Nashville, 
Tenn. (G. G. Ainslie); Syntherisma sanguinale, North Vernon, Ind., 
1908; Echinochloa crus-galli, Princeton, Ind., 1908; and Hordeum pusil- 
lum } Salisbury, N. C., 1909 (R. A. Vickery). 
DESCRIPTIONS OF THE FORMS 
STEM MOTHER 
A number of stem mothers were secured at La Fayette, Ind., in the 
spring of 1911; but as the writer was absent at the time, the description 
was written by Mr. J. J. Davis. There was some slight variation in 
color of the adults, some having a somewhat yellowish tinge. 
Body, including thorax, slightly darker than apple green on the dorsum; venter 
very slightly pruinose, giving it a silvery or whitish color. Eyes dark red. Head 
pale brownish. Antennae (PL 34, F): I and II concolorous with head, but with slight 
duskiness; III, IV, V, and VI black. Beak pale brownish at base and the last two 
segments black. Tip of beak just reaching second coxae. Legs: Basal half of femora 
pale greenish, distal half dusky to black; tibiae pale, with slight brownish tint, the 
distal end black; tarsi black. Cornicles black; style pale whitish, with slight greenish 
tint. 
Measurements made from four individuals immediately after mounting in balsam: 
Length of body. 
With style. 
Width. 
Mm. 
Mm. 
Mm. 
2. 27 
2. 59 
1. 21 
2. 63 
3. 02 
i- 47 
2. 39 
2.39 
1.12 
2. 22 
2. 50 
1. 24 
Cornicles, 0.39, 0.515, 0.408, and 0.51 mm., respectively. The antennal measure¬ 
ments are given in Table I. 
Tabus I .—Length (in millimeters) of antennce of the stem mothers of Macrosiphum 
granarium 
No. 
Specimen No. 
1 
2 
3 
4 
5 
6 
7 
I... 
0. 106 
O. 106 
0.12 
0.11 
O. IO 
155 
o- *55 
II. 
.07 
.07 
.08 
.07 
.066 
. 06 
. 06 
Ill. 
•43 
•44 
•53 
•53 
•435 
.586 
.586 
IV. 
• m 
.i8 S 
•30 
.28 
•15 
•31 
• 3 ° 
V. 
• 24 
• 23 
. 28 
•SO 
•23 
•337 
•337 
VI base. 
. n 
. 12 
. 12 
•13 
. 12 
> 14 
. 14 
VI filament. 
• 31 
•34 
•34 
•39 
•32 
.42 
.44 
Total. 
i- 571 
1. 491 
1. 77 
1.81 
1.421 
2. 008 
2 .018 
