453 
Vahl., Euphorbia pilulifera L., Euphorbia sp., Sida cordifolia L., 
and Sida rhombifolia L. 
It was also found on a native Mucuna vine (Mucuna sp. 
near urens (L.) Medic.) on the Ditch Trail near Keanae, Maui, 
in July, 1920 (Swezey). 
8. Aphis sp. 
A bright orange-yellow species of Aphis, very similar to 
Aphis gossypii in structure, has been observed on Waltheria 
americana L. on the island of Oahu. Even the alate form has 
the abdomen bright yellow. The species is distinguished from 
gossypii by the coloration and by the different proportions of 
the antennal segments in the alate viviparous form. 
9. Aphis medicaginis Koch. 
Aphis papaveris Silvestri, 1909, Bol. Quind. Soe. Agr. Ital. 14, 
p. 344. 
Aphis gossypii Fullaway, 1910, Ann. Rep. Haw. Agric. Exp. Sta. 
for 1909, p. 39 (in part). 
Aphis medicaginis Higgins, 1910, Ann. Rep. Haw. Agric. Exp. Sta. 
for 1909, p. 54. 
The first record of this pest under its correct name was by 
Higgins, in 1910. It was confused by Fullaway with Aphis gos- 
sypii, but is easily distinguished by the shiny black color and 
reticulate derm of the apterous females. 
It has been found on the following cultivated plants: Various 
beans (Phaseolus spp.), Cowpea (Vigna cylindrica (L.) Mer- 
rill), pigeon pea (Cajanus cajan (L.) Millsp.), hyacinth bean 
(Dolichos lablab L.), and the night-blooming Cereus (Cereus 
triangularis (L.) Haw.). It is especially destructive to cowpeas. 
It also occurs on the following weeds: Portulaca oleracea L., 
Medicago denticulata Willd., Indigofera suffruticosa Mill., Eu- 
phorbia pilulifera L., Datura stramonium L., Tribulus cistoides L., 
and Acacia farnesiana (L.) Willd. It was found on Tribulus 
on the outlying islands by the members of the Tanager Expedi- 
tion in 1923. 
10. Aphis sp. 
A heretofore unrecorded and as yet unidentified species of 
Aphis was taken February 25, 1917, in large numbers on Cam- 
