258 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



Description: General color ash-gray, the base color being 

 grayish brown with a covering of white pruinose, more or less 

 broken by the black dorsal tubercle, the black cornicles and a series 

 of black spots on the abdomen. The under side of the abdomen 

 is greenish brown. The two basal segments of the antennae are 

 black, third and fourth dusky yellow and the fifth and sixth dusky 

 to black. 



The abdomen is marked with a distinct pattern of black spots 

 and two dots on each segment forming two longitudinal rows of 

 black spots on each side of the dorsum and two rows of black dots 

 along the median line. The two black dots of the fourth abdomi- 

 nal segment are obscured by the black tubercle which occurs at 

 that point. 



The wings of the alate forms are brownish with a long slender 

 stigma. Antennae with large circular sensoria, somewhat raised. 

 Abdomen with a series of short tubercles along each side, antennae, 

 legs and body with numerous short hairs. Length of body about 

 five millimeters. 



Food plants : Salix spp. 



Nippolachnus Matsumura. 



N. rosae (Cholodkovsky). Lachnus rosae Cholodkovsky. (Fig. 

 28, 2.) 



Zool. Anz., xxii, 471, 1899. 



I have placed this species in the above genus because it resembles 

 very much Matsumura's figures of N. piri and it is undesirable to 

 erect a new genus for it if one already exists. 



The species is so distinct from all others that a detailed descrip- 

 tion is unnecessary. Both the alate and apterous forms have 

 numerous large quadrangular sensoria on the antennae and the 

 stigma is rounded at the apex instead of truncated. The sexual 

 forms are both apterous. The general color is chocolate-brown 

 without special markings. They are found on the stems of native 

 species of roses from Maine to Colorado. The apterous forms are 

 ovoid and about 3 mm. long. The alate forms are about 2.5 mm. 

 long. 



Food plants : Rosa sp. 



Anoecia Koch. 



Key to Species. 



Antennae with transverse or quadrangular sensoria corni 



Antennae with round or oval sensoria querci 



A. corni (Fabricius). Aphis corni Fabricius. (Fig. 28, 3; Fig. 

 3i, 15.) 

 Syst. Ent, 736, 1775. 



