24 Thomas Albert Williams 



Found on Piiius ponder osa var. scopulorum. The apterous 

 form was found by Professor Bruner at Belmont in July, 1889. 

 On June 18, 1890, it was collected in both forms at the same 

 place ; and a few days later was found in great numbers at War 

 Bonnet Canyon. It is one of the finest aphids that I have ever 

 seen ; its general appearance readily distinguishing it from any 

 other species of the genus. 



Cotypes in collection of the University of Nebraska (no. 24) 

 and of the U. S. National Museum (no. 78). 



22. Lachnus rileyi n. sp. 



Apterous form: General color light olive brown, more or less pruinose; 

 fusiform; head rather broad; eyes red; antennae over half the body in 

 length, yellowish brown, dark at tips ; legs generally darker than body, 

 covered with bristly black hairs ; honey tubes represented by a blackish 

 ring. Whole body covered with long black bristly hairs. 



Winged form: General color olive brown; pruinose; head broad, dark, 

 with a central black stripe. Antennae blackish brown ; III longest, its 

 base pale. Eyes red. Thorax blackish. Legs black, with bases of femora 

 and the upper half of the tibiae yellow; hind legs very long; all of tarsi 

 very distinctly 2-jointed. Wings finely punctured ; first and second branches 

 coming out close together ; cubitus obsolete at base, generally with only 

 one branch (a few specimens show two branches) ; all the oblique vein? 

 very slender and delicate; costal and subcostal prominent; stigma ver> 

 long, lanceolate, dusky; stigmal vein nearly straight. Honey tubes as in 

 apterous form. Entire body hairy. 



On Pinus sylvestris and P. strobus, growing on the universit\ 

 campus, October 4, 1888. 



Joints III, IV, V are irregularly covered with numerous sen- 

 soria. This species has a few points in common with Schizo- 

 neura pinicola Thomas. The one branched cubitus shows the 

 connection between Schisoneura and Lachnus already noticed by 

 Kaltenbach, Thomas, Fitch and others. I think, however, that 

 this irregularity in venation does not keep it from Lachnus. All 

 the other characters belong to that genus. 



Type in collection of the U. S. National Museum (no. 79). 



23. Lachnus? smilacis n. sp. 



Apterous viviparous female: On account of the dense pulverulence with 

 which the insect is covered, it has a bluish gray appearance ; when this is 



IOS 



