124 PERGAXDE [S 1 ^] 



prothorax and mesothorax, a longitudinal dusky mark each side of the 

 mesothoracic band, transverse rows of minute black dots on the abdo- 

 men, and a large black spot at the base of the nectaries posteriorly. 



Length of body, exclusive of the tail, 3 to 3.4 mm. Length of an- 

 tennae 3.5 mm.; nectaries 0.7 mm.; tail 0.6 mm. The third joint 

 of the antennae measures 1.2 mm.; the fourth joint 0.6 mm.; the 

 fifth 0.5 mm., and the sixth, with its spur, 1.2 mm. 



The third antennal joint is provided with a row of nine to ten prom- 

 inent sensorial tubercles near its basal one-third. Nectaries stout and 

 tapering ; tail prominent, almost as long as nectaries, densely covered 

 with sharp points and provided each side with five or six small 

 notches, which give rise to a fine, long and curved hair. Hairs of an- 

 tennae and legs stout and spine-like, those of the body rather long, 

 slender and simple. 



In general appearance this species resembles very much Nectaro- 

 fhora Tnillcfolii Fab., but is larger and not so hairy as that species. 



Found upon a species of Epilobium on Popof Island, Alaska. 



Type. — Cat. no. 5276, U. S. National Museum. 



CLADOBIUS POPULEUS Kalt. 

 Cladobius popideics Kalt., Monog. d. Pflanzenl., i, p. 116, 1843. {Aphis.) 



While studying this handsome species and comparing it with the 

 descriptions by Kaltenbach and Koch, I became convinced that it was 

 identical with that described by these authors, notwithstanding both 

 of them speak of the nectaries as being cylindrical, whereas, in fact, 

 they are clavate. This error, or discrepancy was evidently due to the 

 fact that the nectaries of this and probably some other species of this 

 genus are rather more slender than usual and when being carried 

 parallel to the sides of the abdomen, appears to be more or less dis 

 tinctly cylindrical, whereas, in projecting obliquely from the sides of 

 the body their clavate character becomes quite plain. In many of the 

 species of this genus the nectaries are unusually robust and conspic- 

 uously clavate, while in others this character becomes less and less 

 pronounced and may easily lead to errors. 



Besides this oversight, Koch made evidently additional errors while 

 drawing up his diagnosis of this genus, which, no doubt, was due to 

 impaired eyesight. One of the most notable instances is his statement 

 that joints four to six are of nearly equal length and that the, so-called, 

 seventh joint is very small; in reality joints four, five, and the spur, 

 or seventh joint, are, as stated by Kaltenbach, subequal in length, 



