320 NORTH AMERICAN TRYPETINA. 



comparison of a larger number of them will still more prove its 

 insignificance. There will be no reason then to maintain T. 

 melanogastra as a separate species. 



57. T. pura n. sp. J Cinerea, thorace fusco-vittato, pilisqne albidis 

 instructo, abdomine nigro-piloso, capita pedibusque ex fusco-luteis ; seise 

 scutelli quatnor; alae albidse, praeter basim et angulum posticum colore 

 nigro guttato-reticulataB, in apice radiatae, guttis in dimidio posteriore 

 confertis, in anteriore rarissiniis, tribus tamen majoribus ultra stigma 

 in triangulnm dispositis ; vena longitudinalis tertia non pilosa. 



Gray, thorax with brown longitudinal stripes and white pile, abdomen 

 with black pile, head and feet brownish-yellow ; scutellunx with four 

 bristles ; wings whitish, except the basis and the posterior angle, with 

 a black reticulation, which is radiate on the apex ; it is numerously 

 guttate upon the posterior region, sparsely on the anterior ; immediately 

 beyond the stigma there are three large drops, disposed in a triangle ; 

 the third longitudinal vein is not bristly. Long. corp. cum terebrS, 

 0.22; long. al. 0.19. 



Gray; abdomen more blackish-gray. Head clay-yellowish; 

 the front more brownish-brick color (which may be due to a dis- 

 coloration of the described specimen) ; it is remarkably broad, 

 almost half as broad as the whole head ; the usual bristles upon 

 it are black, the bristles on the vertical margin whitish. 

 Antennas almost brownish-brick color ; the short pile on the 

 second segment is whitish ; that on the third is blackish ; the 

 third joint is gently excised on the upper side ; arista blackish- 

 brown. Oral opening of medium size ; its anterior edge some- 

 what drawn upwards and a little projecting in the profile. Pro- 

 boscis not geniculate ; palpi not quite reaching to the anterior 

 edge of the mouth, with black pile. Eyes rounded, their perpen- 

 dicular diameter but little longer than the horizontal one. Cheeks 

 of a moderate breadth. Thoracic dorsum with indistinctly 

 limited, although well-marked, rather dark brown longitudinal 

 stripes ; its short pile is whitish, the bristles black. Scutellum 

 grayish-brown, with a broad grayish border on the sides, and 

 with four black bristles. The ground color of the abdomen is 

 black, the posterior margin of each segment brick-red, especially 

 the last segment, where this border is the broadest ; its pile is 

 yellowish-white in the vicinity of the basis only, elsewhere with- 

 out exception black. Ovipositor flattened, rather broadly trun- 

 cate at the end, shorter than the last two abdominal segments 



