The Aphididae of Nebraska 25 



removed the insect is dark olive green. Antennae and legs reddish, the 

 former but little more than one third as long as the body, on inconspicu- 

 ous tubercles; II longer and more slender than I; III, IV, V and VI 

 subequal in length; III thickest, the rest becoming successively slenderer; 

 VI wtih a very short claw; III and VI subcylindrical, IV and V rather 

 club-shaped. Head small. Eyes small, black. Beak pale, reaching to or 

 beyond the hind coxae. Abdomen large and swollen, somewhat wrinkled. 

 Honey tubes tubercle-like, inconspicuous, black, scarcely noticeable in the 

 maturer individuals but easily seen in younger ones. Tail wanting. Legs 

 short, the hind pair not reaching the tip of the abdomen in the larger 

 specimens; hairy. Tarsi concolorous with legs, long, 2-jointed, with long 

 claws. The very small head and thorax and the very large abdomen gives 

 the insect a very characteristic balloon-shaped appearance. Antennae with 

 only a few scattered, short, bristle-like hairs, generally two or three being 

 at the apical end of each joint. Body without hairs of any kind except 

 the apex of the abdomen which has a few bristle-like hairs. Length of 

 body about 5 mm., width about 2.75 mm., antennae 1.90 mm., beak 1.20 mm. 

 In very young individuals the body is somewhat angled, the antennae 

 S-jointed and the beak reaches beyond the tip of the abdomen. The legs 

 are very long and the eyes somewhat rudimentary. 



This is only referred to this genus provisionally. The legs, 

 eyes and general appearance are quite different from typical mem- 

 bers of the genus; but the beak, tarsi, honey tubes and antennae 

 are similar to those of Lachnns. The winged form, if there is 

 one, is necessary for a correct location of the species. It will 

 probably be found to belong to a new genus. 



On stem, leaf-stalks and leaves of Sniilax herbaceae. Fre- 

 mont, July 31, 1890. 



Type in the collection of U. S. National Museum (no. 77). 

 [This species is Pemphigus attenuatus Osborn-Sirrinne.] 



Subfamily APHIDINAE 



Tribe CALLIPTERINI 



■ Genus Chaitophorus 



24. Chaitophorus bruneri n. sp. 



Apterous viviparous female: Very dark green, almost black. Antennae 

 not half the body in length, two basal and three apical joints dusky to 

 black, rest pale. Head dark green. Thorax pale with darker bands. Ab- 

 domen with alternate dark and light transverse bands on the front part, 

 then one broad dark green band covering two thirds of its dorsal surface 



109 



