'^'"■^■^ RILEY AND MOXELL ON APIIIDIDiE. 27 



often Mibconua^ o. Nectaries light green, reaching |o the tip ; the bai.al pori ion slender, 

 expanding at th(^ middle to twice its former diameter, and again snddenly contracteil 

 at the mouth, which is furnished with the usual aunnlus. l\ul yellowish, about one- 

 third as long as the nectaries. 



Length LC2"""; to tip of wings 3.04'«>". Apterous individuals entirely pale green, 

 Avith two darker green dorsal vittie. 



On the under side of leaves of Sallx lucida, 8. nigra, and S. hahylonica. 

 June, Saint Louis, Mo. This species comes under Siplwcorijne Pass., 

 but I do not think that the characters given by Passerini justify its 

 separation from EhopalosipJmm Koch. 



EHOPALOSiPnu:^ rhois, n. six— Winged incUviduaJs: Antennas a little longer than the 

 body, mounted on very inconspicuous tubercles ; joints proportioned as usual ; sevenl li 

 joint a little longer than the two preceding taken together. Nectaries three times 

 a,s long as the slender style ; the diameter of the apical two-thirds in normal speci- 

 mens nearly twice the basal diameter; the apex contracted to about the same dia- 

 meter as the base, and with the mouth very slightly flaring. 



Length 1.52— 2.02™'» ; to tip of wings 3.81™™. 



This interesting species was collected some years ago on an undeter- 

 mmed species of Sumach. The only note of its colors that I have is 

 that the general color is reddish-brown. 



Individuals occasionally occur having- one of the nectaries lacking the 

 basal constriction, and I have seen a single specimen having one of its 

 nectaries subcylindric. 



Drepancsiphum, Koch. 

 Rostrum short. 



Antennae long and slender, seated on frontal tubercles ; third and setaceous sev- 

 enth joint long. 



Nectaries long, enlarged beneath towards the base. 



Style inconspicuous or none. 



Wings long. 



Front wings with four oblique veins; the cubitus twice forked; marginal cell 

 elongated towards the apex of the wing. 



Hind wings with two discoidals. 



Habits sporadic. 



Professor Passerini is evidently in error in uniting this g-enus with 

 Siphonophora. Its structure, habits, and the non-existence of viviparous 

 apterous females point towards a relationship with the genus CaUipterm^ 

 together with which it may be considered as forming a group in the 

 AphidincG. 



Drepaxosipiium acerifolu (Thos.). 



Siphonophora accrifolice, Thos. Bull, ii, 111. St. Lab. K'at. Hist. 

 Siphonophora acericola, Thos. (icon. 1. c). 



The antennae are longer and the marginal cell broader than in any 

 previously described American Aphid. The nectaries reach about to 

 the tip of the abdomen, and are suddenly dilated at base to twice the 

 diameter of their apices. The stigmal vein is usually enlarged at base 

 for a distance equal to the breadth of the stigma. The dorsal tubercles, 

 though very cliaractexistic, are not suf&cient to warrant a generi(,' sepa- 

 ration. Some species of Callipferus have somewhat similar i)rocesses, 



