SANBORN : KANSAS APHIDID/E. 33 



as is often the case in Callipterus. Honey-tubes short and thick, 

 tuberculate, rarely subobsolete. Style tuberculate. 



Genus Callipterus Koch. 



Head large, vertex fiat. Antennae smooth, usually about as 

 long as the body but sometimes much longer, seven-jointed, 

 seventh joint rarely less than the sixth,''' but variable in length. 

 Sensoria of the third joint in a single row. Beak does not ex- 

 tend beyond the mesocoxfie. Wings frequently clouded, stigma 

 short and concave on the cephalic border. Venation gracefully 

 curved. Legs moderately long. Abdomen hirsute in some 

 species of apterous females. Apical segment with two anal 

 valves. Honey-tubes short. Style knobbed. This genus com- 

 prises some of the most beautiful forms of the Aphidin?e. 



Genus Calaphis Walsh. i'' 



Antennae long, linear, seven-jointed, fourth shorter than the 

 third, fifth shorter than the fourth, six less than one-half as 

 long as fifth, seventh slender and twice as long as the sixth. 

 Prothorax more than one-half as long as the thorax. Honey- 

 tubes moderate. Wings steeply roofed and differing from those 

 of Aphis only in the total absence of the fourth or stigmal vein 

 and the usually robust discoidal veins. 



Genus Cryptosiphum Buckston.^^ 



Vertex convex. Antennae very short in the apterous, but 

 longer in the winged form ; seventh joint one and one-half 

 times the length of the sixth. Beak extends to the mesocoxse. 

 Wings short, rounded, and venation normal. Legs rather short. 

 Honey-tubes absent or rudimentary. Style small but distinct 

 in the winged form. 



Genus Monellia Oestlund.i^ 



Antennae longer than the body, on no frontal tubercles. Beak 

 very short. Thorax low and flat ; prothorax nearly as large as 

 the thorax proper. Wings held horizontal in repose ; venation 

 as in Callipterus. Honey-tubes not obvious. Style short, en- 

 larged at the apex. In general the insects are small and deli- 

 cate, of a pale color and strongly depressed body. 



16. This is an exception to the rule of not counting the unguis or seventh joint when shorter 

 than the sixth joint. 



17. No representative in this text. 



3-Bull., Vol, III, No. 1. 



