32 BULLETIN 826, U. S. DEPARTMENT OF AGRICULTURE. 



solitary upon the foliage of trees. Males winged. Oviparous female with a distinct 

 elongated ovipositor and producing several eggs. 



Type (mono typical), Drepanosiphum acerifalii Thos. 



Genus DREPANOSIPHUM Koch. 



Plate IV, MM. 



1S55. Drepanosiphum Koch, Die Pflanzenlaiise Aphiden, p. 201. 

 1885. Type fixation, Lichtcnstein, Monographie des Aphidicns, p. 175. 



Cornicles very long, quite distinctly swollen. in the middle or subcylindric. An- 

 tennae of six segments with short, scattered hairs and oa al or subcircular sensoria. 

 Fore wings with the media twice branched. Hind wings with both media and cubitus 

 present. Cauda knobbed, anal plate slightly indented. 



Forms living upon the foliage of plants, males usually winged. Oviparous female 

 with a distinct elongated ovipositor. 



Type C fixed by Lichtenstein, 1885), Aphis platanoides Schr. 



Genus NEOSYMYDOBIUS, n. gen. 



The genus Neosymydobius is erected for species similar to that 

 described as Symydobius albasipJvus Davis. It is evident that this 

 species is not a Symydobius. Members of that genus are very large 

 and differ in several ways. We place the present genus here with 

 considerable doubt. 



Characters. — Cornicles small, truncate, Callipterus-like. Antennas of six segments 

 which are armed with a few rather stout hairs. Fore wings with the media twice 

 branched, hind wings with both media and cubitus present. Cauda knobbed, anal 

 plate slightly indented. Forms living in colonies upon the foliage of trees. Body, 

 particularly of the apterous forms, covered with rather stout spine-like hairs. Ovipar- 

 ous female with a long oWpositor and depositing several eggs. Males usually winged. . 



Type, Symydobius albasiphus Davis. 



Subtribe MONAPHIDINA. 



The subtribe Monaphidina, erected for the genus Monaphis, is very 

 similar in most respects to the Callipterina, but lacks the cornicle 

 dorsally. It seems evident that it is a specialization from insects of 

 the Callipterus type in much the same way that Fullawaya is related 

 to those of the Chaitophorus type. One genus only is known at 

 present. This differs more from the Callipterina than does Fullawaya 

 from the Chaitophorina. 



Genus MONAPHIS Walker. 



1870. Monaphis Walker, The Zoologist, p. 2001. 



1894. Bradyaphis Mordwilko, Varshava Universitetskiia Izviestiia, v. 8, p. 59. 



Few remarks on the synonymy of the genus Monaphis Walker are 

 necessary as the same species was used as type in both cases men- 

 tioned. The genus is a very remarkable one, being peculiar in many 

 ways. 



Characters. — Cornicles faint; antennae of six segments, without distinct hairs, 

 sensoria small and circular; cauda somewhat rounded but with an acute point or pro- 

 jection ; anal plate similar; fore wings with the media twice branched ; hind wings with 

 both media and cubitus present. 



Type (fixed by Walker, 1870), Apms antennata Kalt. 



