24 BULLETIN UNITED STATES GEOLOGICAL SURVEY. [Vol.Y. 



flarker green marks near tlie base of the nectaries. Antennae abont two-thirds as long 

 as the body; pale, slightlj^ dusky towards the apex ; apical joint as long as, or slightly 

 longer than, the third. Nectaries entirely black, slightly tapered towards the npiex, 

 twice as long as the tarsi. Style short, pale green. Legs entirely pale, except the 

 faintly dusky tarsi and tips of the tibiie. Length 1.52"^°'. 



On tlie under side of leaves of Calendtda micrantha. July ; Saint 

 Louis, Mo. This species may be expected to occur on the genus Tagetes, 

 to which the "French marigold" belongs. The apical joint of the 

 rostrum is rather short and robust. 



Aphis CEriiALAXTHi, Thos. 



This species does not approach the genus CaUljpterus, as its describer 

 supposes. The semicircular fourth vein, which I suppose suggested 

 this, is a character common to many species of ApJddincc, and is only 

 valuable in distinguishing some genera from Lachnus. A closely allied 

 species occurs on Fenthormn sedoides {GrassiUacecc), having much the 

 same color, and showing the same characteristic x^ruinose spots. 



Aphis memcagixis, Korh. 



On Garagana arhorcscenSj Eohinia vi.^eosa, and Melilotns italica. This 

 species has not been previously noticed as occurring in America. The 

 shining black dorsum of fully developed individuals will distinguish it 

 from other American species. 



Length 1.27— l.TT'""'^ to tip of wings 2.54—3.04°^™. July; Saint 

 Louis, Mo. 



Appiis salicicola (Thos.). 



Siphonophora salicicola, Thos. Bull. Ul. St. Lai). Nat. Hist, ii, p. 8. 

 Aphis brevifurea, Monl. MSS. 



In April last. Miss E. A. Smith sent me a short nectaried Ai)hidian, 

 which I have provisionally referred to the genus Gladobius^ with the in- 

 formation that it was the same species which slie had sent to Professor 

 Thomas the previous year, and which he had described as 8. salicicola. 

 Thinking the error a very strange one, I wrote to Professor Thomas in 

 regard to it, and have received through his kindness a number of tyx)e- 

 specimens of salicicola, an examination of Avhich proves them identical 

 with Ein Aphis, wliich I have x)reviously found on leaves of Blue-grass. 

 It is very i^robable that the labels on the vials containing these two 

 species were interchanged, or else that the two si^ecies Avere mixed to- 

 gether; though it is not imx^ossible that the si^ecies may occur on both 

 grass and willow. I sliould have thought that the error was made by 

 myself had I not collected this species on two separate occasions. The 

 stigma is rather linear, a little wider than the forklets are long, and 

 tapered at apex. Forklets of the cubitus smaller than in any knoAvn 

 species, their length being about one-liffch the distance between their 

 bases and that of the lower cubital branch. 



Length 1.27—2.03'"'" ; alar expanse 5.81""^'. April. 



The species XJlainly belongs to Aphis, and not to Biphonophora. 



