270 NORTH AMERICAN TRYPETINA. 



small crossvein, the second immediately before the end of the discal cell ; 

 the fifth indentation follows the outer side of the great crossvein (which 

 runs obliquely backwards) ; the sixth, separated from the preceding by 

 a black band of moderate breadth, is almost triangular ; the three small 

 hyaline dots between the third and fourth veins lie, the first under, the 

 stigma, the second between the two crossveins, near the fourth vein, the 

 third above the last of the hyaline excisions along the posterior margin. 

 Hub. Brazil. 



The coloring of the abdomen of T. insecla and phoenicura 

 seems to be somewhat variable, and hence not to be relied on as a 

 specific character; the more marked are the differences in the out- 

 line and picture of the wings. 



27. T. poecilogastra n. sp. . Lutea, scutello setis sex instructo, 

 abdomine nigro-variegato, alis latis fuscis, insequaliter limpido-guttatis, 

 venisque longitudinalibus prima, tertia et quintsl coufertim nigro-setosis. 



Clay-yellow, scutellum with six bristles, abdomen variegated with black ; 

 wings broad, blackish-brown, with unevenly distributed hyaline drops ; 

 the first, third, and fifth longitudinal veins densely beset with black 

 bristles. Long. corp. 0.21; long. al. 0.24. 



Clay-yellow; the color of head and antennae more ochre-yellow ; 

 the last joint of the latter elongated, rounded at the tip ; the long 

 brown arista beset with a very short pubescence. The face is 

 rather retreating nearly as far as the vicinity of the anterior edge 

 of the mouth ; the latter is somewhat turned upwards and abruptly 

 projecting when seen in profile. The vertical diameter of the 

 eyes has double the length of the horizontal one; hence, the 

 cheeks are very narrow. Proboscis tumid ; palpi rather broad 

 and short, although they project a little beyond the anterior edge 

 of the mouth. The usual frontal bristles are black. The two 

 pairs of bristles on the middle line of the thoracic dorsum are 

 weak and of a blackish-brown color, like the other thoracic 

 bristles; the anterior pair is at an unusual distance behind 

 the transverse suture. Scutellum rather flat, with six brown 

 bristles. Metathorax with two brown longitudinal stripes. 

 Abdomen with a complicated black picture, the only visible por- 

 tions of the ground color being an uninterrupted middle line of 

 almost trapezoidal spots, and on both sides of it, two rows of 

 other spots ; the spots of the outer row lie on the anterior angles 

 of the single segments ; those of the inner row on the anterior 



