128 NINETEENTH REPORT STATE~- ENTOMOLOGIST OF MINNESOTA—IQ22 
43. Genus ANURAPHIS Del Guercio, 1907.. Type: Aphis pyre 
Koch, 1854. Pleurites with lateral tubercles in place of glands; sec- 
ondary sensoria of antennae with narrow margins, and of the usual 
type; cornicles short, cylindrical, with crowded reticulations, which 
appear as rows of minute spines; cauda short and cone-shaped. The 
genus as first indicated by Del Guercio, based on the relative length 
of the cornicles and cauda, is an artificial character and will not hold. 
Baker has lately restricted the genus, based on the peculiar type of 
cauda. Tho better, it also is not sufficient to separate it from the 
genus Aphis. Adding to this the peculiar type of reticulations on the 
cornicles, we probably have a natural genus. Two species are known 
from Minnesota: 
(31) ANURAPHIS BAKERI (Cowen) Baker, 1920 
The short-beaked clover aphis. Found on apple end clover. 
(32) ANURAPHIS CRATAEGIFOLIAE (Fitch) Baker, 1920 
The long-beaked clover aphis. On Crataegus and clover. 
44. Genus APHIS Linnaeus, 1758. Type: Aphis sambuci Linnaeus, 
1758. Pleurites with lateral tubercles (sometimes reduced in number 
or wanting) ; cornicles long and cylindrical (sometimes reduced or want- 
ing), cr with a wider base; reticulations on the cornicles open or 
broken lines; cauda usually long and more or less copstricted near 
the base, and usually with a clear area above. Several attempts have 
been made of late to further restrict the genus but without satisfactory 
results. The grouping of the species is still unsatisfactory and more 
or less artificial, but is probably the best that can at present be given 
with the incomplete knowledge of their life histories and the sexes. 
The species may be grouped in two divisions based on the arrangement 
of the secondary sensoria on the antennae: 
a. The secondary sensoria on the antennae are numerous (15-50 or more), 
scattered, circular, and ‘varying more*sor less in Sizey..7 -.0- -qen ee 
Division POLYSENSORIA 45 
b. The secondary sensoria on the entennae are found in small numbers (4-15), 
usually large and subequal, and arranged in a single row, or nearly so.. 
Division PARVISENSORIA 48 
45. Division POLYSENSORIA. The Polysensoria probably rep- 
resent an early condition of the secondary sensoria, when they were 
numerous, small, and scattered over the first three segments of the 
flagellum. With their further development for greater efficiency, they 
became fewer and larger, allowing more favorable positions for func- 
tioning, which gave rise to the second division as the more modern 
