COCCIDAE, APHIDIDAE AND ALEYRODIDAE. 



43 



be this species, and I suspect that the A. medicaginis Koch, recorded by Van der 

 Goot from various localities in the East, is the same ; as is also the A. medicaginis 

 Koch recorded by Das {Mem. Indian Mus., VI, p. 203, 1918) from the Lahore 

 district. The British Museum (Natural History) has received specimens of 

 A. laburni from Ceylon, on a variety of Leguminous host plants. 



39. Aphis nerii Boyer 



Neiafu, Tonga and Malololelei, Upolu, ii.l924, on imported Asclepias. This 

 species is also present in Fiji, and is found in Europe, North and South America, 

 the West Indies, Africa, India, Java, etc. 



40. Aphis tavaresi Del Guercio 



Upolu, Malololelei, on lemon trees, 15.ii.l924. There is a remarkable 

 resemblance between the apterous viviparous of this species and those of 

 Toxoptera aurantii (Boyer), and, where this form only is present, it is necessary 

 to rely for determination upon the relative lengths of and the imbrications on 

 the cornicles. In the alate viviparous this difficulty does not arise, for, 

 apart from the difference in neuration in the two species, the colour distribution 

 in the antennae and the sensoriation of the third antennal segment provide good 

 characters for differentiation. It is possible that Myzus citricidus Kirk, is this 

 species, in which case the latter name would have priority. 



41. Toxoptera aurantii (Boyer) 



Apia, on leaves of Cacao and Hibiscus tiliaceus, iv. and v. 1924. 



ALEYRODIDAE 



42. Aleuroplatus (Orchamus) samoanus sp. n. Text-fig. 3. 



Pupa Case. — Very pale stramineous with a thin coating of transparent 

 secretion which forms a thick layer around the margin and raises the pupa case 

 from the leaf surface slightly. A distinct median longitudinal carina running 

 the whole length ; the abdominal segments visible ; margin somewhat crenulate 

 and curved slightly inwards at the thoracic tracheal folds. 



When treated with potash, oval, one-third longer than broad, constricted 

 at thoracic tracheal folds. Margin minutely crenulate with small setae situated 



