322 NORTH AMERICAN TRYPETINA. 



the end of the diseal cell ; the numerous drops of the discal cell 

 are of very unequal size, show an inclination to be arranged iu 

 two rows and leave more black space on the anterior than on the 

 posterior side ; in the third posterior cell the somewhat lacerated 

 reticulation is confined in a very marked manner, to the some- 

 what larger longitudinal half of the cell, contiguous to the discal 

 cell ; both crossveins are perpendicular and less distant from each 

 other than the length of the small crossvein; the third vein is not 

 bristly. 



Hab. Massachusetts (Sanborn). 



Observation. I place this species in the genus Euaresta, on 

 account of the reticulation, which is radiate on the apex. While 

 T. festiva, spectabilis, bella, obscuriventris, mexicana, melano- 

 gastra, and tennis, all closely related, form the solid nucleus of 

 the genus, the connection of T. pura with it is a purely artificial 

 one, based upon a resemblance in the picture of the wings ; it has 

 more real relationship to those Urellise, the scutellum of which 

 has four bristles. But in order to place T. pura in that genus, it 

 will be necessary to modify its definition, which will have to be done 

 in further developing the system of the Trypetina. According 

 to the system adopted in my Monograph of the European Try- 

 petidae, this species would have to be placed in the genus 

 Tephritis. 



58. T. abstersa Lw. % $. (Tab. XI, f. 7.) Cinerea, capite, pedibus 

 et scutello setis quatuor instructo, flavis ; alarum dimidium basale 

 colore cinereo obsolete reticulatum, apicale macula nigra, pulehre radi- 

 ata, ornatum. 



Gray, head, feet, and the four-bristly scutellum yellow ; the proximal half 

 of the wings with a faded gray reticulation, the distal half with a black, 

 handsomely radiated spot. Long. corp. $ 0.12 0.13, J cum terebra 

 0.130.14; long. al. 0.120.13. 



STN. Trypeta abstersa LOEW, Dipt. Amer. Cent. II, No. 77. 



The ground color of thorax and abdomen is rather variable ; 

 generally it is altogether blackish; the humeri, often also the 

 upper side of the pleurae, the scutellum, the basis of the abdomen, 

 and the posterior margins of its segments usually are, to a greater 

 or lesser extent, clay -yellowish ; sometimes the yellowish color is 

 so extended, that, except upon the thoracic dorsum and the meta- 

 thorax, hardly any blackish is left; nevertheless the ground color 

 of the thorax and of the abdomen is so covered up by a pale 



