GENEKIC CLASSIFICATION OF APHIDIDAE. 55 



Oestlund says it may be too close to Rhopalosiphum and compares it 

 with nympliaeae. But had he compared it with ampuMata which he 

 also included in Rhopalosiphum he would probably have found it 

 quite similar, and it is the writer's belief that Oestlund's species is in 

 reality Amphorophora. 



Finding that Macrosiphum was preoccupied Schouteden gave the 

 new name Nectarosiphon to ruhicola and Nectarosiphon, therefore, 

 will become a synonym. In 1913, Del Guercio erected the genus 

 Eunectarosiphon with rubi Kalt. as type. There appears not to be 

 sufficient difference here, however. The insects are in their main 

 points the same and Eunectarosiphon is placed, consequently, as a 

 synonym. Van der Goot in the same year used ampullata as the 

 type of Rhopalosiphum. 



In 1900 Del Guercio used the name Macrosiphum for a genus 

 including three species: Oonvolvuli Kalt., viciae Kalt., and rubi Kalt. 

 He has since used both viciae and rubi as the types of other genera. 

 This leaves only convolvuli in his Macrosiphum, and this species to all 

 appearances is an Amphorophora. His Macrosiphum, therefore, is 

 listed here under Amphorophora. 



Characters. — Head with prominent and slightly diverging antennal tubercles. 

 Antennae of six segments, armed with circular sensoria. Wing venation normal. 

 Cornicles long and somewhat swollen in the middle. Cauda elongate but much snorter 

 than the cornicles. 



Type (monotypical), Amphorophora ampullata Buckton. 



Genus CAPITOPHORUS Van der Goot. 

 Plate VIII, A-C. 

 1913. Capitophorus Van der Goot, Tijd. voor Ent., v. 56, p. 84. 



In the genus Capitophorus Van der Goot certain species suggest 

 Rhopalosiphum in general characters, whereas others more nearly 

 approach Myzus in their main characters. The capitate spines 

 appear to be the best means of determining the genus. 



Characters. — Head with antennal tubercles which are not markedly prominent, 

 these each with one or more prominent knobbed spines. Vertex with a central pro- 

 jection on which similar spines are located. Antennae of six segments, armed with 

 subcircular sensoria, the first segment with a projecting process on which one or more 

 knobbed spines are located. Wing venation normal; cornicles long and slender, 

 slightly constricted in the middle and somewhat enlarged toward the distal extremity. 

 Cauda rather short and conical. 



Type (fixed by Van der Goot, 1913), Aphis carduinus Walker. 



Genus FRANCOA Del Guercio. 1 



1917. Francoa Del Guercio, Redia, v. 12, p. 201. 



The genus Francoa Del Guercio appears very close in some respects 

 to Capitophorus but on account of the peculiar frontal tubercle and 

 the structure of the first antennal segment it is held to be distinct. 



1 It seems doubtful if this genus is distinct from Capitophorus. We have been unable to make a careful 

 study of the type. 



