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132 NINETEENTH REPORT STATE ENTOMOLOGIST OF MINNESOTA—IQ22 
d. Abdomen with a dorsal tubercle above the cauda...Genus CAVARIELLA 59 
e. Cornicles with two swellings, one in the middle and one apical............ 
Genus CACHRYPHORA 60 
f. Cornicles with only the apical swelling......... Genus EPAMEIBAPHIS 61 
56. Genus RHOPALOSIPHUM Koch, 1854. Type: Aphis 
nymphaeae Linnaeus, 1761. The characters are those of the genus 
Aphis, but with the cornicles swollen on the upper. half, or club 
shaped. 
(63) RHOPALOSIPHUM NYMPHAEAE (Linnaeus) Koch, 1854 
A species common on various water plants. 
57. Genus SIPHOCORYNE Passerini, 1863. Type: Aphis xylos- 
tet Schrank, 1801. Similar to Rhopalosiphum but with a large and 
stout cauda. 
(64) SIPHOCORYNE XYLOSTEI (Schrank) Passerini, 1863 
Found on honeysuckle (Lonicera). 
58. Genus LIOSOMAPHIS Walker, 1868. Type: Aphis ber- 
beridis Kaltenbach, 1843. Cornicles distinctly swollen in the middle, 
(65) LIOSOMAPHIS BERBERIDIS (Kaltenbach) Walker, 1868 
At times abundant on barberry. 
59.: Genus CAVARIELLA Del Guercio, 1911. Type: Aphis pas- 
tinacae Linnaeus, 1758. The distinguishing character of this genus 
is the presence of a tubercle above the cauda, which appears as a 
cauda above the cauda. 
(66) CAVARIELLA PASTINACAE (Linnaeus) Del Guercio, 1911 
Found on parsnips and other umbelliferous plants. 
(67) CAVARIELLA SALICIS (Monell) 
Rather common on Salix. 
60. Genus CACHRYPHORA gen. nov. Type: Rhopalosiphum 
serotinae Oestlund, 1887. Cornicles with a double swelling, one in 
the middle and a second as a distinct swelling of the apex, a decided 
constriction separates the two; cauda conical. The enlarged apices” 
of the sensilla on the head and antennae would indicate a Myzini re- 
lationship, but the frontal margin and the head place it in the tribe 
under consideration. 
(68) CACHRYPHORA SEROTINAE (Oestlund) 
Cornicles capitate at apex and swollen below 
Found on goldenrod, solidago. 
61. Genus EPAMEIBAPHIS gen nov. Type: Aphis frigidae 
Oestlund, 1886. We may also include this genus with the Clavicornia 
