104 MISCELLANEOUS STUDIES 



Measurements: Body length, 1.53 to 1.989 mm. (av. 1.74 mm.); 

 width of thorax, 0.68 to 0.918 mm. (av. 0.765 mm.) ; antennae total, 

 1.122 to 1.36 mm. (av. 1.272 mm.) ; III, 0.289 to 0.425 m.m (av. 0.3648 

 mm.) ; IV, 0.1955 to 0.272 mm. (av. 0.2266 mm.) ; V, 0.187 to 0.221 

 mm. (av. 0.1885 mm.) ; VI, base 0.102 to 0.136 mm. (av. 0.1119 mm.) ; 

 VI, spur 0.289 to 0.357 mm. (av. 0.3145 mm.) ; cornicles, 0.1785 to 

 0.221 mm. (av. 0.2118 mm.) ; cauda, 0.136 to 0.162 mm. (av. 0.14875 

 mm.) ; hind tarsus, 0.136 to 0.152 mm. (av. 0.1372 mm.). 



Specimens taken by the author in May, 1916, on Papaver sp. (cul- 

 tivated poppy) near El Cajon, San Diego County, seem to him to be 

 Aphis papaveris Fabr. (Genera Insectorum, p. 303, 1717), and prob- 

 ably are the same as the above species, although they may be different. 

 There are from thirteen to fifteen irregular secondary sensoria on III 

 as above, but IV and V are without secondary sensoria, with one 

 exception, in which there was one small sensorium near the middle of 

 IV. The cauda is equal to the hind tarsi, the cornicles being longer, 

 and about the same comparative length as above. The third antennal 

 segment appears to be longer in comparison than above in some speci- 

 mens. Lateral abdominal tubercles are present on the first, third, and 

 seventh abdominal segments. 



Measurements: Body length, 1.486 to 1.908 mm. (av. 1.711 mm.) ; 

 width of thorax, 0.595 to 0.765 mm. (av. 0.68 mm.) ; antennae total, 

 1.224 to 1.343 mm. (av. 1.2878 mm.) ; III, 0.323 to 0.374 mm. (av. 

 0.3536 mm.) ; IV, 0.2125 to 0.22 mm. (av. 0.2193 mm.) ; V, 0.187 to 

 0.204 mm. (av. 0.2024 mm.) ; VI, base 0.102 to 0.119 mm. (av. 0.1054 

 mm.) ; VI, spur 0.255 to 0.34 mm. (av. 0.2992 mm.) ; cornicles, 0.187 

 to 0.221 mm. (av. 0.204 mm.) ; cauda, 0.136 to 0.153 mm. (av. 0.142 

 mm.) ; hind tarsus, 0.119 mm. 



Specimens taken by the author near Montebello, Los Angeles 

 County, in December, 1916, and in Riverside from January to May, 

 1917, on Vicia faba seem to be somewhat different from the fore- 

 going, yet are very nearly identical. Gillette considers that they 

 might possibly be Aphis fdbae Scop., which may or may not be 

 synonymous with Aphis euonomi Fabr. Superficially, the coloring 

 seems to be the same, although on close observation it appears to be 

 a very dark green in ground color, covered with a blackish tinge. The 

 legs are colored as above, however. 



Specimens from Rumex appear to have considerably more brown 

 in the ground color than the preceding varieties. Secondary sensoria 

 are located as follows: III, 14 to 24 (av. 18) ; IV, 4 to 7 (av. 5) ; V, 



