SANBORN : KANSAS APHIDID-K. 37 



with red. Ocelli present. Beak black, 0.45 mm. long, extend- 

 ing midway between the pro- and raesocoxse. 



Prothorax dark, thorax black. Wings hyaline, venation slen- 

 der and of a dark brown color. Stigma, 0.65 mm. long by 0.16 

 mm. broad. Total wing expansion, 6.00 mm. Legs hirsute, 

 femora, tarsi and distal part of tibia black, remainder yellowish. 



Abdomen greenish yellow, hirsute, bordered laterally with 

 eight black spots, and on the dorsal surface are eight black 

 transverse bars. Honey-tubes black, 0.14 mm. long, or about 

 equal to the tarsi in length. They are also incrassate and im- 

 bricated. Style hirsute, knobbed, the latter black, base green- 

 ish yellow, 0.09 mm. long, or about one-half the length of the 

 honey-tubes. Total length of the body, 2.18 mm. 



This form was taken July 9 in a Cottonwood gall, and is 

 named in honor of my professor in botany, W. C. Stevens. 



Following is the description of the gall as given by Mr. Bur- 

 rows :'- "This gall occurs on the ventral side of the leaf of the 

 Cottonwood {Pojndus monilifera) in early summer. The gall is 

 an elongated, semielliptical swelling of the midrib near the 

 center of the leaf; 10 mm. in length and 5 mm. in height; 

 green in color when young but of a straw color during matur- 

 ity ; walls thin, firm, and succulent. The gall has a mouth- 

 like opening on the dorsal side of the leaf, which remains 

 slightly open. This oritice runs parallel with the midrib nearly 

 the length of the gall. The leaf folds dorsally along the mid- 

 rib, enclosing the orifice of the gall. The young lice are found 

 both in the gall with the stem-mother and outside clustered 

 around the opening, being protected there by the fold of the 

 leaf. The lice are protected with a white powder-like excres- 

 cence. These galls are not common in this region. I am 

 under the impression that, owing to the early disappearance of 

 this gall, only one brood of gall-producing stem-mothers exist 

 during the summer, which brood, without doubt, comes from 

 the impregnated egg. The subsequent broods do not have the 

 power of producing galls." 



Chaitophorus flabellus, n. ep. Plate XX, fig. 95. 



Head dark and cone-shaped, as shown in the illustration. 

 Antennae black, except the basal half of the third joint, which 



18. Burrows's unpublished manuscript. 



