NORTH AMERICAN HYMENOPTERA. 307 



Pronotiim about as in signatifrons ; lateral angles and five longitudinal lines 

 white; two apical dots and an irregular arcuated spot or band on the anterior 

 submargin and a cloud on the posterior disc dusky or piceous ; scutelluni marked 

 as in signatifrons, or with the apical field mostly brown. Elytral nervures 

 broadly white tinged with testaceous in places, the areoles quite uniformly edged 

 with fuscous. Wings highly iridescent; tergum and all beneath black, edges 

 of all the segments and pleural pieces pale. Legs spotted and banded witli pale- 

 The female has the last ventral segment and legs pale, with the hind edge of the 

 former and the base of the anterior and intermediate femora and a few spots on 

 the tibise brown ; the spines long, stout and pale in both sexes. 



Genital characters: ^ .—Last ventral segment feebly concave behind; valve 

 short, the hind edge nearly straight, very feebly angled at the middle; plates 

 short and broad, triangular, obtuse at apex ; pygofers a little longer than the 

 plates, the broad arcuated apex appearing beyond their tips. Female : Last ven- 

 tral segment a little longer than the preceding, but slightly shorter on the mid- 

 dle, regularly concavely arcuated behind, the lateral angles prominent, right 

 angled ; pygofers broad, their obtuse apex nearly equaling the stout oviduct. 



Mississippi. Described from numerous examples received from 

 Mr, Howard Ewarts Weed, whose industry has brought to light 

 many new and interesting members of the little-known Jassid fauna 

 of the " Mississippi Bottoms," and it is with ])leasure I embrace this 

 opportunity of acknowledging my indebtedness to his labors and 

 generosity by dedicating to him this neat little species. 



►-<•►— 



THE NORTH A^flERICAN PEMPHKEDONID.*:. 



BY WILLIAM J. FOX. 



Before proceeding I wish to thank Mr. E. T. Cresson and Prof. 

 C. V. Riley for favors received. I have made this paper as short as 

 possible, omitting all generic descriptions, as in a few years the rap- 

 idly increasing number of new species will undoubtedly demand a 

 more exhaustive treatise on them. The types of all our species have 

 been before me, except those few described by Say and Kohl, and 

 of course those which I have been unable to identify. The following 

 table, taken from Cresson's "Synopsis," will serve to distinguish the 

 genera : 



Anterior wings without a third discoidal cell, therefore only one recurrent ner- 

 vure. 

 Anterior wings with two submarginal cells. 



Abdomen subsessile; recurrent nervure Joining the first transverse cubital 



nervure SpilomoiiH Siiuck. 



Abdomen petiolate ; recurrent nervure received in the middle of tiio first 



submarginal cell SliKiimw .Tur. 



Anterior wings with one submarginal cell AllliUopIainiN Gir. 



TRANS. AM. ENT. SOC. XIX. DKCEMBEK, 1892. 



