80 DIPTERA OF NORTH AMERICA. 



vein is much-- broader ; the third longitudinal vein is much more 

 undulated, and the last portion of the fourth longitudinal vein is 

 shorter than the posterior transverse vein, whereas it is a little 

 longer in Tryp. sparsa. None of the drops on the wings of Tryp. 

 sparsa is of a more considerable size than the others, whereas 

 Tryp. rolundipennis has such a drop between the third and fourth 

 longitudinal veins, opposite to the base of the discal cell ; the 

 drops are in general equally distributed in Tryp. sparsa, they 

 are much more irregularly grouped in Tryp. rotundipennis ; the 

 size and number of the drops diminishes a little from the base 

 towards the apex in Tryp. sparsa; their number only, not their size 

 diminishes in Tryp. rotundipennis ; their size increasing towards 

 the posterior border in Tryp. sparsa, this is not the case in Tryp. 

 rotundipennis. In Tryp. sparsa the white crescent seaming the 

 apex of the wing is entire, in Tryp. rotundipennis it is dissolved 

 into several spots. Finally, the anterior border of the wings of 

 Tryp. rotundipennis bears a row of small clear spots, whereas 

 Tryp. sparsa has no trace of them. 

 Hah. Middle States. (Osten-Sacken.) 



14. T. elatlirata Loew. <j?. (Tab. II, fig. 15.) — Cana, capite pedi- 

 busque flavis, feinoribus litura nigra signatis, alis rare reticulars, stig- 

 mate atro albo-guttato, peristoruio modice producto, proboscide breviter 

 geniculate. 



Whitish-gray ; head and legs yellow; wings with a diffuse reticulation, 

 and the black stigma including a limpid drop ; oral border moderately 

 prolonged, proboscis shortly geniculated. Long. corp. 0.12 Long. al. 

 0.13. 



Head yellowish ; the lateral borders of the front, the face, and 

 the much descending cheeks whitish. The bristles on the front 

 black, on the sides of the vertex and posterior orbit white. The 

 face with rather deep subantennal furrows prolonged to the oral 

 border, which is not very projecting. Antennae fulvous, rather 

 short ; the anterior corner of the third joint a little acute ; the 

 second joint with very short black hairs ; antennal bristle black 

 and moderately long, with the pubescence scarcely visible. Tho- 

 rax and scutellum whitish gray, with short pubescence and black 

 bristles. The scutellum bears four bristles, the two apical ones 

 being much shorter and less stout than the lateral ones ; its tip is 

 sometimes yellow. The whitish-gray abdomen has two rows of very 



