SANBORN : KANSAS APHIDID.E, 65 



on the lateral margins. There are two black transverse bars 

 caudad of the honey-tubes and six cephalad. Three or four of 

 the latter are sometimes continuous, forming a quadrate patch 

 irregular in outline. The honey-tubes are dark gray, incras- 

 sate, and 0.27 mm. long. The style is concolorous with the 

 abdomen, cone-shaped, and 0.09 mm. long. 



This aphid is gregarious on greenhouse violets and colonizes 

 mostly the ventral side of the leaves. Some will feign death 

 when disturbed and fall from the leaves ; others will remain 

 with a firmer grasp than ever. 



Rhopalosiplium rois Monell. Plate XIII, fig. 73. 



Head brown. Antennoe dark and slightly hirsute ; length 

 of segments : I, 0.07 mm. ; II, 0.07 mm. ; III, 0.50 mm. ; IV, 

 0.43 mm. ; V, 0.34 mm. ; VI, 0.16 mm. ; VII, 0.54 mm. ; total 

 length, about 2.08 mm., or about the length of the honey-tube 

 longer than the body. Sensoria circular ; six to twelve on the 

 third joint, in a row ; none on the fourth ; the usual one near 

 the distal end of the fifth ; about five small and one large one 

 at the distal end of the sixth. Eyes black ; ocular tubercles 

 prominent; ocelli conspicuous. Beak black, 0.45 mm. long, 

 and extending midway between the pro- and mesocoxser. 



Thorax all dark brown. Wings hyaline, veins black ; first 

 discoidal bordered with a narrow margin of a dark brown about 

 as wide as the vein itself ; second discoidal bordered in the 

 same manner but fainter. The subcostal is also bordered with 

 the same on its caudal margin. The stigma is dark brown, 

 0.12 mm. wide and 0.72 mm. long. Total wing expansion, 

 7.12 mm. Legs all dark, hirsute, and long in proportion to 

 the body. 



Abdomen light brown. Honey-tubes dark, dilated more dis- 

 tally than proximally ; they are 0.39 mm. long, or twice the 

 length of the tarsi. Style dark, hirsute, and conical, 0.18 mm. 

 long, or one-half the length of the honey-tubes. Total length 

 of the body, 1.81 mm. 



This form was taken June 27, on sumac {RJius glabra). It is 

 gregarious and colonizes the tender stems, petioles, and the 

 ventral side of the leaves. The individuals remain quite near 

 each other while on this host-plant, and have a remarkably 

 good protective col'oration. 



5-Bull., Vol. Ill, No. 1. 



